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pdfFEDERAL TRANSIT BUS TEST
Performed for the Federal Transit Administration U.S. DOT
In accordance with CFR 49, Volume 7, Part 665
Manufacturer: ????
Model: ????
Submitted for Testing in Service-Life Category
??Year /??0,000 Miles
MONTH YEAR
Report Number: LTI-BT-R????
The Thomas D. Larson
Pennsylvania Transportation Institute
201 Transportation Research Building
The Pennsylvania State University
University Park, PA 16802
(814) 865-1891
Bus Testing and Research Center
2237 Old Route 220 North
Duncansville, PA 16635
(814) 695-3404
Page 1 of 112
FEDERAL TRANSIT BUS TEST
Performed for the Federal Transit Administration U.S. DOT
1200 New Jersey Avenue, SE
Washington, DC 20590
In accordance with CFR 49, Volume 7, Part 665
Manufacturer: ????
Manufacturer’s address: ????
Model: ?????
Submitted for Testing in Service-Life Category
?? Year /??0,000 Miles
Report Number: LTI-BT-R????
Director, Bus Research
and Testing Center
Quality Authorization
Title
Page 2 of 112
Date
TABLE OF CONTENTS
Page
EXECUTIVE SUMMARY .......................................................................................................................... 3
ABBREVIATIONS .................................................................................................................................... 5
BUS CHECK-IN ....................................................................................................................................... 6
1. MAINTAINABILITY
1.1
1.2
1.3
ACCESSIBILITY OF COMPONENTS AND SUBSYSTEMS ....................................... 18
SERVICING, PREVENTATIVE MAINTENANCE, AND REPAIR AND
MAINTENANCE DURING TESTING ........................................................................... 21
REPLACEMENT AND/OR REPAIR OF SELECTED SUBSYSTEMS ......................... 25
2. RELIABILITY - DOCUMENTATION OF BREAKDOWN AND REPAIR
TIMES DURING TESTING ................................................................................................................ 29
3. SAFETY - A DOUBLE-LANE CHANGE (OBSTACLE AVOIDANCE TEST) .................................... 32
4. PERFORMANCE TESTS
4.1
PERFORMANCE - AN ACCELERATION, GRADEABILITY, AND TOP
SPEED TEST ............................................................................................................... 35
4.2
PERFORMANCE – BUS BRAKING PERFORMANCE TEST……………………..…… 39
5. STRUCTURAL INTEGRITY
5.1
5.2
5.3
5.4
5.5
5.6
5.7
STRUCTURAL STRENGTH AND DISTORTION TESTS - STRUCTURAL
SHAKEDOWN TEST ...................................................................................................
STRUCTURAL STRENGTH AND DISTORTION TESTS - STRUCTURAL
DISTORTION ...............................................................................................................
STRUCTURAL STRENGTH AND DISTORTION TESTS - STATIC
TOWING TEST ............................................................................................................
STRUCTURAL STRENGTH AND DISTORTION TESTS - DYNAMIC
TOWING TEST ............................................................................................................
STRUCTURAL STRENGTH AND DISTORTION TESTS
- JACKING TEST .........................................................................................................
STRUCTURAL STRENGTH AND DISTORTION TESTS
- HOISTING TEST ........................................................................................................
STRUCTURAL DURABILITY TEST ............................................................................
6. FUEL ECONOMY TEST - A FUEL CONSUMPTION TEST USING AN
APPROPRIATE OPERATING CYCLE ............................................................................................
44
48
60
61
64
66
68
79
7. NOISE
7.1
7.2
INTERIOR NOISE AND VIBRATION TESTS ............................................................ 94
EXTERIOR NOISE TESTS ......................................................................................... 99
8. EMISSIONS ......................................................................................................................................106
Page 3 of 112
EXECUTIVE SUMMARY
???? submitted a model ????, ????-powered ?? seat/??-foot bus, for a ??
yr/??0,000 mile STURAA test. The odometer reading at the time of delivery was ??,???
miles. Testing started on ???? ??, 2002 and was completed on ???? ??, 2002. The
Check-In section of the report provides a description of the bus and specifies its major
components.
The primary part of the test program is the Structural Durability Test, which also
provides the information for the Maintainability and Reliability results. The Structural
Durability Test was started on ???? ??, 2002 and was completed on ???? ??, 2002.
The interior of the bus is configured with seating for ?? passengers including the
driver. Free floor space will accommodate ?? standing passengers resulting in a
potential load of ?? persons. At 150 lbs per person, this load results in a measured
gross vehicle weight of ??,??? lbs. The first segment of the Structural Durability Test
was performed with the bus loaded to a GVW of ??,??? lbs. The middle segment was
performed at a seated load weight of ??,??? lbs and the final segment was performed at
a curb weight of ??,??? lbs. Durability driving resulted in unscheduled maintenance and
failures that involved a variety of subsystems. A description of failures, and a complete
and detailed listing of scheduled and unscheduled maintenance is provided in the
Maintainability section of this report.
Effective January 1, 2010 the Federal Transit Administration determined that the
total number of simulated passengers used for loading all test vehicles will be based on
the full complement of seats and free-floor space available for standing passengers
(150 lbs per passenger). The passenger loading used for dynamic testing will not be
reduced in order to comply with Gross Axle Weight Ratings (GAWR’s) or the Gross
Vehicle Weight Ratings (GVWR’s) declared by the manufacturer. Cases where the
loading exceeds the GAWR and/or the GVWR will be noted accordingly. During the
testing program, all test vehicles transported or operated over public roadways will be
loaded to comply with the GAWR and GVWR specified by the manufacturer.
Accessibility, in general, was adequate, components covered in Section 1.3
(Repair and/or Replacement of Selected Subsystems) along with all other components
encountered during testing, were found to be readily accessible and no restrictions were
noted.
The Reliability section compiles failures that occurred during Structural Durability
Testing. Breakdowns are classified according to subsystems. The data in this section
are arranged so that those subsystems with more frequent problems are apparent. The
problems are also listed by class as defined in Section 2. The test bus encountered no
Class 1 or Class 2 failures. Of the ???? reported failures, ???? were Class 3 and ????
were Class 4.
The Safety Test, (a double-lane change, obstacle avoidance test) was safely
performed in both right-hand and left-hand directions up to a maximum test speed of 45
mph. The performance of the bus is illustrated by a speed vs. time plot. Acceleration
and gradeability test data are provided in Section 4, Performance. The average time to
Page 4 of 112
obtain 50 mph was ??.?? seconds. The Stopping Distance phase of the Brake Test
was completed with the following results; for the Uniform High Friction Test average
stopping distances were ??.??’ at 20 mph, ??.??’ at 30 mph, ??.??’ at 40 mph and
???.??’ at 45 mph. The average stopping distance for the Uniform Low Friction Test
was ??.??’. There was no deviation from the test lane during the performance of the
Stopping Distance phase. During the Stability phase of Brake Testing the test bus
experienced no deviation from the test lane but did experience pull to the left during
both approaches to the Split Friction Road surface. The Parking Brake phase was
completed with the test bus maintaining the parked position for the full five minute
period with no slip or roll observed in both the uphill and downhill positions.
The Shakedown Test produced a maximum final loaded deflection of 0.???
inches with a permanent set ranging between 0.??? to 0.??? inches under a distributed
static load of ??,??? lbs. The Distortion Test was completed with all subsystems, doors
and escape mechanisms operating properly. No water leakage was observed
throughout the test. All subsystems operated properly.
The Static Towing Test was performed using a target load (towing force) of
??,??? lbs. All four front pulls were completed to the full test load with no damage or
deformation observed. The Dynamic Towing Test was performed by means of a frontlift tow. The towing interface was accomplished using a hydraulic under-lift wrecker.
The bus was towed without incident and no damage resulted from the test. The
manufacturer does not recommend towing the bus from the rear, therefore, a rear test
was not performed. The Jacking and Hoisting Tests were also performed without
incident. The bus was found to be stable on the jack stands, and the minimum jacking
clearance observed with a tire deflated was ?.? inches.
A Fuel Economy Test was run on simulated central business district, arterial, and
commuter courses. The results were ?.?? M/lb, ?.?? M/lb, and ?.?? M/lb respectively;
with an overall average of ?.?? M/lb.
A series of Interior and Exterior Noise Tests was performed. These data are
listed in Section 7.1 and 7.2 respectively.
The Emissions Test was performed. These results are available in Section 8 of
this report.
Page 5 of 112
ABBREVIATIONS
ABTC
- Altoona Bus Test Center
A/C
- air conditioner
ADB
- advance design bus
ATA-MC - The Maintenance Council of the American Trucking Association
CBD
- central business district
CW
- curb weight (bus weight including maximum fuel, oil, and coolant; but
without passengers or driver)
dB(A)
- decibels with reference to 0.0002 microbar as measured on the "A" scale
DIR
- test director
DR
- bus driver
EPA
- Environmental Protection Agency
FFS
- free floor space (floor area available to standees, excluding ingress/egress areas,
area under seats, area occupied by feet of seated passengers, and the vestibule area)
GVL
- gross vehicle load (150 lb for every designed passenger seating
position, for the driver, and for each 1.5 sq ft of free floor space)
GVW
- gross vehicle weight (curb weight plus gross vehicle load)
GVWR
- gross vehicle weight rating
MECH
- bus mechanic
mpg
- miles per gallon
mph
- miles per hour
PM
- Preventive maintenance
PSTT
- Penn State Test Track
PTI
- Pennsylvania Transportation Institute
rpm
- revolutions per minute
SAE
- Society of Automotive Engineers
SCH
- test scheduler
SA
- staff assistant
SLW
- seated load weight (curb weight plus 150 lb for every designed passenger seating
position and for the driver)
STURAA - Surface Transportation and Uniform Relocation Assistance Act
TD
- test driver
TECH
- test technician
TM
- track manager
TP
- test personnel
Page 6 of 112
TEST BUS CHECK-IN
I. OBJECTIVE
The objective of this task is to log in the test bus, assign a bus number, complete
the vehicle data form, and perform a safety check.
II. TEST DESCRIPTION
The test consists of assigning a bus test number to the bus, cleaning the bus,
completing the vehicle data form, obtaining any special information and tools from the
manufacturer, determining a testing schedule, performing an initial safety check, and
performing the manufacturer's recommended preventive maintenance. The bus
manufacturer must certify that the bus meets all Federal regulations.
III. DISCUSSION
The check-in procedure is used to identify in detail the major components and
configuration of the bus.
The test bus consists of a ????, model ????. The bus has a front door, forward of
the front axle, and a rear door centered between the axles which is equipped with a
???? model ???? handicap lift. Power is provided by a ????-fueled, ???? engine
coupled to a ???? transmission.
The measured curb weight is ??,??? lbs for the front axle and ??,??? lbs for the
rear axle. These combined weights provide a total measured curb weight of ??,??? lbs.
There are ?? seats including the driver and room for ?? standing passengers bringing
the total passenger capacity to ??. Gross load is 150 lb x ?? = ??,??? lbs. At full
capacity, the measured gross vehicle weight is ??,??? lbs.
Page 7 of 112
VEHICLE DATA FORM
Page 1 of 7
Bus Number:
Arrival Date:
Bus Manufacturer:
Vehicle Identification
Number (VIN):
Model Number:
Date:
Personnel:
Chassis:
WEIGHT:
Individual Wheel Reactions:
Weights
(lb)
Front Axle
Right
Middle Axle
Left
Right
Rear Axle
Left
Right
Left
CW
SLW
GVW
Total Weight Details:
Weight (lb)
CW
SLW
GVW
GAWR
Front Axle
Middle Axle
Rear Axle
Total
GVWR:
Dimensions:
Length (ft/in)
Width (in)
Height (in)
Front Overhang (in)
Rear Overhang (in)
Wheel Base (in)
Wheel Track (in)
Front:
Rear:
Page 8 of 112
VEHICLE DATA FORM
Page 2 of 7
Bus Number:
Date:
CLEARANCES:
Lowest Point Outside Front Axle
Location:
Clearance(in):
Lowest Point Outside Rear Axle
Location:
Clearance(in):
Lowest Point between Axles
Location:
Clearance(in):
Ground Clearance at the center (in)
Front Approach Angle (deg)
Rear Approach Angle (deg)
Ramp Clearance Angle (deg)
Aisle Width (in)
Inside Standing Height at Center
Aisle (in)
BODY DETAILS:
Body Structural Type
Frame Material
Body Material
Floor Material
Roof Material
Windows Type
□ Fixed
□ Movable
Window Mfg./Model No.
Number of Doors
Front
Rear
Mfr. / Model No.
Dimension of Each Door (in)
Passenger Seat Type
Front-
Rear-
□ Cantilever
□ Pedestal
□ Other
(explain)
□ Air
□ Spring
□ Other
(explain)
Mfr. / Model No.
Driver Seat Type
Mfr. / Model No.
Number of Seats (including Driver)
Page 9 of 112
VEHICLE DATA FORM
Page 3 of 7
Bus Number:
Date:
BODY DETAILS (Contd..)
2
Free Floor Space ( ft )
Height of Each Step at Normal
Position (in)
Front
1.
2.
3.
4.
Middle 1.
2.
3.
4.
Rear
2.
3.
4.
1.
Step Elevation Change - Kneeling
(in)
ENGINE
□ C.I.
□ Alternate Fuel
□ S.I.
□ Other (explain)
Location
□ Front
□ Rear
□ Other
(explain)
Fuel Type
□ Gasoline
□ CNG
□ Methanol
□ Diesel
□ LNG
□ Other
(explain)
□ Injected
□ Carburetion
□ Electrical
□ Pneumatic
Type
Mfr. / Model No.
Fuel Tank Capacity (indicate units)
Fuel Induction Type
Fuel Injector Mfr. / Model No.
Carburetor Mfr. / Model No.
Fuel Pump Mfr. / Model No.
Alternator (Generator) Mfr. / Model
No.
Maximum Rated Output
(Volts / Amps)
Air Compressor Mfr. / Model No.
3
Maximum Capacity (ft / min)
Starter Type
Starter Mfr. / Model No.
Page 10 of 112
□ Other
(explain)
VEHICLE DATA FORM
Page 4 of 7
TRANSMISSION
Transmission Type
□ Manual
□ Automatic
□ Mechanical
□ Electrical
□ Independent
□ Beam Axle
□ Air
□ Spring
□ Independent
□ Beam Axle
□ Air
□ Spring
□ Independent
□ Beam Axle
□ Air
□ Spring
Mfr. / Model No.
Control Type
□ Other
Torque Converter Mfr. / Model No.
Integral Retarder Mfr. / Model No.
SUSPENSION
Number of Axles
Front Axle Type
Mfr. / Model No.
Axle Ratio (if driven)
Suspension Type
□ Other
(explain)
No. of Shock Absorbers
Mfr. / Model No.
Middle Axle Type
Mfr. / Model No.
Axle Ratio (if driven)
Suspension Type
□ Other
(explain)
No. of Shock Absorbers
Mfr. / Model No.
Rear Axle Type
Mfr. / Model No.
Axle Ratio (if driven)
Suspension Type
No. of Shock Absorbers
Mfr. / Model No.
Page 11 of 112
□ Other
(explain)
VEHICLE DATA FORM
Page 5 of 7
Bus Number:
Date:
WHEELS & TIRES
Front
Wheel Mfr./ Model No.
Tire Mfr./ Model No.
Rear
Wheel Mfr./ Model No.
Tire Mfr./ Model No.
BRAKES
Front Axle Brakes Type
□ Cam
□ Disc
□ Other (explain)
□ Cam
□ Disc
□ Other (explain)
□ Cam
□ Disc
□ Other (explain)
Mfr. / Model No.
Middle Axle Brakes Type
Mfr. / Model No.
Rear Axle Brakes Type
Mfr. / Model No.
Retarder Type
Mfr. / Model No.
HVAC
Heating System Type
□ Air
□ Water
□ Yes
□ No
Capacity (Btu/hr)
Mfr. / Model No.
Air Conditioner
Location
Capacity (Btu/hr)
A/C Compressor Mfr. / Model No.
STEERING
Steering Gear Box Type
Mfr. / Model No.
Steering Wheel Diameter
Number of turns (lock to lock)
Page 12 of 112
□ Other
VEHICLE DATA FORM
Page 6 of 7
Bus Number:
Date:
OTHERS
Wheel Chair Ramps
Location:
Type:
Wheel Chair Lifts
Location:
Type:
Location:
Number:
Mfr. / Model No.
Emergency Exit
CAPACITIES
Fuel Tank Capacity (units)
Engine Crankcase Capacity (gallons)
Transmission Capacity (gallons)
Differential Capacity (gallons)
Cooling System Capacity (quarts)
Power Steering Fluid Capacity
(quarts)
Page 13 of 112
VEHICLE DATA FORM
Page 7 of 7
Bus Number:
Date:
List all spare parts, tools and manuals delivered with the bus.
Part Number
Description
Page 14 of 112
Qty.
COMPONENT/SUBSYSTEM INSPECTION FORM
Page 1 of 1
Bus Number:
Subsystem
Date:
Checked
Air Conditioning Heating
and Ventilation
Body and Sheet Metal
Frame
Steering
Suspension
Interior/Seating
Axles
Brakes
Tires/Wheels
Exhaust
Fuel System
Power Plant
Accessories
Lift System
Interior Fasteners
Batteries
Initials
Page 15 of 112
Comments
CHECK - IN
???? INDUSTRIES INC.
MODEL ????
Page 16 of 112
CHECK - IN CONT.
???? INDUSTRIES INC.
MODEL ???? EQUIPPED WITH A ???? MODEL ????
HANDICAP LIFT
Page 17 of 112
1. MAINTAINABILITY
1.1 ACCESSIBILITY OF COMPONENTS AND SUBSYSTEMS
1.1-I. TEST OBJECTIVE
The objective of this test is to check the accessibility of components and
subsystems.
1.1-II. TEST DESCRIPTION
Accessibility of components and subsystems is checked, and where accessibility
is restricted the subsystem is noted along with the reason for the restriction.
1.1-III. DISCUSSION
Accessibility, in general, was adequate. Components covered in Section 1.3
(repair and/or replacement of selected subsystems), along with all other components
encountered during testing, were found to be readily accessible and no restrictions were
noted.
Page 18 of 112
ACCESSIBILITY DATA FORM
Page 1 of 2
Bus Number:
Date:
Component
Checked
ENGINE :
Oil Dipstick
Oil Filler Hole
Oil Drain Plug
Oil Filter
Fuel Filter
Air Filter
Belts
Coolant Level
Coolant Filler Hole
Coolant Drain
Spark / Glow Plugs
Alternator
Diagnostic Interface Connector
TRANSMISSION :
Fluid Dip-Stick
Filler Hole
Drain Plug
SUSPENSION :
Bushings
Shock Absorbers
Air Springs
Leveling Valves
Grease Fittings
Page 19 of 112
Initials
Comments
ACCESSIBILITY DATA FORM
Page 2 of 2
Bus Number:
Date:
Component
HVAC :
Checked
A/C Compressor
Filters
Fans
ELECTRICAL SYSTEM :
Fuses
Batteries
Voltage regulator
Voltage Converters
Lighting
MISCELLANEOUS :
Brakes
Handicap Lifts/Ramps
Instruments
Axles
Exhaust
Fuel System
OTHERS :
Page 20 of 112
Initials
Comments
1.2 SERVICING, PREVENTIVE MAINTENANCE, AND
REPAIR AND MAINTENANCE DURING TESTING
1.2-I. TEST OBJECTIVE
The objective of this test is to collect maintenance data about the servicing,
preventive maintenance, and repair.
1.2.-II. TEST DESCRIPTION
The test will be conducted by operating the NBM and collecting the following data
on work order forms and a driver log.
1. Unscheduled Maintenance
a. Bus number
b. Date
c. Mileage
d. Description of malfunction
e. Location of malfunction (e.g., in service or undergoing inspection)
f. Repair action and parts used
g. Man-hours required
2. Scheduled Maintenance
a. Bus number
b. Date
c. Mileage
d. Engine running time (if available)
e. Results of scheduled inspections
f. Description of malfunction (if any)
g. Repair action and parts used (if any)
h. Man-hours required
The buses will be operated in accelerated durability service. While typical items
are given below, the specific service schedule will be that specified by the manufacturer.
A. Service
1. Fueling
2. Consumable checks
3. Interior cleaning
B. Preventive Maintenance
4. Brake adjustments
5. Lubrication
6. 3,000 mi (or equivalent) inspection
Page 21 of 112
7. Oil and filter change inspection
8. Major inspection
9. Tune-up
C. Periodic Repairs
1. Brake reline
2. Transmission change
3. Engine change
4. Windshield wiper motor change
5. Stoplight bulb change
6. Towing operations
7. Hoisting operations
1.2-III. DISCUSSION
Servicing and preventive maintenance were performed at manufacturer-specified
intervals. The following Scheduled Maintenance Form lists the mileage, items serviced,
the service interval, and amount of time required to perform the maintenance. Table 1
is a list of the lubricating products used in servicing. Finally, the Unscheduled
Maintenance List along with Unscheduled Maintenance-related photographs is included
in Section 5.7, Structural Durability. This list supplies information related to failures that
occurred during the durability portion of testing. The Unscheduled Maintenance List
includes the date and mileage at which the malfunction occurred, a description of the
malfunction and repair, and the time required to perform the repair.
Page 22 of 112
SCHEDULED MAINTENANCE
Page 23 of 112
Table 1. STANDARD LUBRICANTS
The following is a list of Texaco lubricant products used in bus testing conducted by the
Penn State University Altoona Bus Testing Center:
ITEM
PRODUCT CODE
TEXACO DESCRIPTION
Engine oil
#2112
URSA Super Plus SAE 30
Transmission oil
#1866
Automatic Trans Fluid
Mercon/Dexron II
Multipurpose
Gear oil
#2316
Multigear Lubricant
EP SAE 80W90
Wheel bearing &
Chassis grease
#1935
Starplex II
Page 24 of 112
1.3 REPLACEMENT AND/OR REPAIR OF
SELECTED SUBSYSTEMS
1.3-I. TEST OBJECTIVE
The objective of this test is to establish the time required to replace and/or repair
selected subsystems.
1.3-II. TEST DESCRIPTION
The test will involve components that may be expected to fail or require
replacement during the service life of the bus. In addition, any component that fails
during the NBM testing is added to this list. Components to be included are:
1.
2.
3.
4.
5.
Transmission
Alternator
Starter
Batteries
Windshield wiper motor
1.3-III. DISCUSSION
During the test, several additional components were removed for repair or
replacement. Following is a list of components and total repair/replacement time.
MAN HOURS
???????????????
?.??
At the end of the test, the remaining items on the list were removed and replaced.
The transmission assembly took ?.?? man-hours (two men ?.?? hrs) to remove and
replace. The time required for repair/replacement of the four remaining components is
given on the following Repair and/or Replacement Form.
Page 25 of 112
REPLACEMENT AND/OR REPAIR FORM
Page 1 of 1
Subsystem
Replacement Time
Transmission
? man hours
Wiper Motor
? man hours
Starter
? man hours
Alternator
? man hours
Batteries
? man hours
Page 26 of 112
1.3 REPLACEMENT AND/OR REPAIR OF
SELECTED SUBSYSTEMS
TRANSMISSION REMOVAL AND REPLACEMENT
(?.? MAN HOURS)
WIPER MOTOR REMOVAL AND REPLACEMENT
(?.? MAN HOURS)
Page 27 of 112
1.3 REPLACEMENT AND/OR REPAIR OF
SELECTED SUBSYSTEMS CONT.
STARTER REMOVAL AND REPLACEMENT
(?.? MAN HOURS)
ALTERNATOR REMOVAL AND REPLACEMENT
(?.? MAN HOURS)
Page 28 of 112
2. RELIABILITY - DOCUMENTATION OF BREAKDOWN
AND REPAIR TIMES DURING TESTING
2-I. TEST OBJECTIVE
The objective of this test is to document unscheduled breakdowns, repairs, down
time, and repair time that occur during testing.
2-II. TEST DESCRIPTION
Using the driver log and unscheduled work order forms, all significant
breakdowns, repairs, man-hours to repair, and hours out of service are recorded on the
Reliability Data Form.
CLASS OF FAILURES
Classes of failures are described below:
(a) Class 1: Physical Safety. A failure that could lead directly to
passenger or driver injury and represents a severe crash situation.
(b) Class 2: Road Call. A failure resulting in an en route interruption
of revenue service. Service is discontinued until the bus is replaced
or repaired at the point of failure.
(c) Class 3: Bus Change. A failure that requires removal of the bus from
service during its assignments. The bus is operable to a rendezvous
point with a replacement bus.
(d) Class 4: Bad Order. A failure that does not require removal of
the bus from service during its assignments but does degrade coach
operation. The failure shall be reported by driver, inspector, or
hostler.
2-III. DISCUSSION
A listing of breakdowns and unscheduled repairs is accumulated during the
Structural Durability Test. The following Reliability Data Form lists all unscheduled
repairs under classes as defined above. These classifications are somewhat subjective
as the test is performed on a test track with careful inspections every two hours.
However, even on the road, there is considerable latitude on deciding how to handle
many failures.
The Unscheduled Repair List is also attached to provide a reference for the
repairs that are included in the Reliability Data Forms.
Page 29 of 112
The classification of repairs according to subsystem is intended to emphasize
those systems which had persistent minor or more serious problems. There were no
Class 1 or 2 failures. Of the ???? Class 3 failures, eleven involved the suspension
system, two involved the engine/transmission, and the remaining two involved the
axle/tires. These, and the remaining ???? Class 4 failures are available for review in
the Unscheduled Maintenance List, located in Section 5.7 Structural Durability.
Page 30 of 112
Reliability
Page 31 of 112
3. SAFETY - A DOUBLE-LANE CHANGE
(OBSTACLE AVOIDANCE)
3-I. TEST OBJECTIVE
The objective of this test is to determine handling and stability of the bus by
measuring speed through a double lane change test.
3-II. TEST DESCRIPTION
The Safety Test is a vehicle handling and stability test. The bus will be operated
at SLW on a smooth and level test track. The bus will be driven through a double lane
change course at increasing speed until the test is considered unsafe or a speed of 45
mph is reached. The lane change course will be set up using pylons to mark off two 12
foot center to center lanes with two 100 foot lane change areas 100 feet apart. The bus
will begin in one lane, change to the other lane in a 100 foot span, travel 100 feet, and
return to the original lane in another 100 foot span. This procedure will be repeated,
starting first in the right-hand and then in the left-hand lane.
3-III. DISCUSSION
The double-lane change was performed in both right-hand and left-hand
directions. The bus was able to safely negotiate the test course in both the right-hand
and left-hand directions up to the maximum test speed of 45 mph.
Page 32 of 112
SAFETY DATA FORM
Page 1 of 1
Bus Number:
Date:
Personnel:
Temperature (°F):
Humidity (%):
Wind Direction:
Wind Speed (mph):
Barometric Pressure (in.Hg):
SAFETY TEST: DOUBLE LANE CHANGE
Maximum safe speed tested for double-lane change to left
45 mph
Maximum safe speed tested for double-lane change to right
45 mph
Comments of the position of the bus during the lane change: A safe profile was
maintained through all portions of testing.
Comments of the tire/ground contact patch: Tire/ground contact was maintained
through all portions of testing.
Page 33 of 112
3. SAFETY
RIGHT - HAND APPROACH
LEFT - HAND APPROACH
Page 34 of 112
4.1 PERFORMANCE - AN ACCELERATION, GRADEABILITY,
AND TOP SPEED TEST
4-I. TEST OBJECTIVE
The objective of this test is to determine the acceleration, gradeability, and top
speed capabilities of the bus.
4-II. TEST DESCRIPTION
In this test, the bus will be operated at SLW on the skid pad at the PSBRTF. The
bus will be accelerated at full throttle from a standstill to a maximum "geared" or "safe"
speed as determined by the test driver. The vehicle speed is measured using a Correvit
non-contacting speed sensor. The times to reach speed between ten mile per hour
increments are measured and recorded using a stopwatch with a lap timer. The time to
speed data will be recorded on the Performance Data Form and later used to generate
a speed vs. time plot and gradeability calculations.
4-III. DISCUSSION
This test consists of three runs in both the clockwise and counterclockwise
directions on the Test Track. Velocity versus time data is obtained for each run and
results are averaged together to minimize any test variability which might be introduced
by wind or other external factors. The test was performed up to a maximum speed of
50 mph. The fitted curve of velocity vs. time is attached, followed by the calculated
gradeability results. The average time to obtain 50 mph was ??.?? seconds.
Page 35 of 112
PERFORMANCE DATA FORM
Page 1 of 1
Bus Number:
Date:
Personnel:
Temperature (°F):
Humidity (%):
Wind Direction:
Wind Speed (mph):
Barometric Pressure (in.Hg):
INITIALS:
Air Conditioning compressor-OFF
Checked
Ventilation fans-ON HIGH
Checked
Heater pump motor-Off
Checked
Defroster-OFF
Checked
Exterior and interior lights-ON
Checked
Windows and doors-CLOSED
Checked
ACCELERATION, GRADEABILITY, TOP SPEED
Counter Clockwise Recorded Interval Times
Speed
Run 1
Run 2
Run 3
10 mph
20 mph
30 mph
40 mph
Top Test
Speed(mph) 50
Clockwise Recorded Interval Times
Speed
Run 1
Run 2
10 mph
20 mph
30 mph
40 mph
Top Test
Speed(mph) 50
Page 36 of 112
Run 3
Performance Summary Sheet
Page 37 of 112
Velocity Curve
Page 38 of 112
4.0 PERFORMANCE
4.2 Performance - Bus Braking
4.2 I.
TEST OBJECTIVE
The objective of this test is to provide, for comparison purposes, braking
performance data on transit buses produced by different manufacturers.
4.2 II.
TEST DESCRIPTION
The testing will be conducted at the PTI Test Track skid pad area. Brake tests
will be conducted after completion of the GVW portion of the vehicle durability test. At
this point in testing the brakes have been subjected to a large number of braking snubs
and will be considered well burnished. Testing will be performed when the bus is fully
loaded at its GVW. All tires on each bus must be representative of the tires on the
production model vehicle
The brake testing procedure comprises three phases:
1.
Stopping distance tests
i.
ii.
2.
3.
Dry surface (high-friction, Skid Number within the range of 70-76)
Wet surface (low-friction, Skid Number within the range of 30-36)
Stability tests
Parking brake test
Stopping Distance Tests
The stopping distance phase will evaluate service brake stops. All stopping
distance tests on dry surface will be performed in a straight line and at the speeds of 20,
30, 40 and 45 mph. All stopping distance tests on wet surface will be performed in
straight line at speed of 20 mph.
The tests will be conducted as follows:
1.
Uniform High Friction Tests: Four maximum deceleration straight-line
brake applications each at 20, 30, 40 and 45 mph, to a full stop on a
uniform high-friction surface in a 3.66-m (12-ft) wide lane.
2.
Uniform Low Friction Tests: Four maximum deceleration straight-line
brake applications from 20 mph on a uniform low friction surface in a 3.66m (12-ft) wide lane.
When performing service brake stops for both cases, the test vehicle is
accelerated on the bus test lane to the speed specified in the test procedure and this
speed is maintained into the skid pad area. Upon entry of the appropriate lane of the
skid pad area, the vehicle's service brake is applied to stop the vehicle as quickly as
possible. The stopping distance is measured and recorded for both cases on the test
Page 39 of 112
data form. Stopping distance results on dry and wet surfaces will be recorded and the
average of the four measured stopping distances will be considered as the measured
stopping distance. Any deviation from the test lane will be recorded.
Stability Tests
This test will be conducted in both directions on the test track. The test consists
of four maximum deceleration, straight-line brake applications on a surface with split
coefficients of friction (i.e., the wheels on one side run on high-friction SN 70-76 or more
and the other side on low-friction [where the lower coefficient of friction should be less
than half of the high one] at initial speed of 30 mph).
(I)
The performance of the vehicle will be evaluated to determine if it is
possible to keep the vehicle within a 3.66m (12 ft) wide lane, with the dividing line
between the two surfaces in the lane’s center. The steering wheel input angle required
to keep the vehicle in the lane during the maneuver will be reported.
Parking Brake Test
The parking brake phase utilizes the brake slope, which has a 20% grade. The
test vehicle, at its GVW, is driven onto the brake slope and stopped. With the
transmission in neutral, the parking brake is applied and the service brake is released.
The test vehicle is required to remain stationary for five minutes. The parking brake test
is performed with the vehicle facing uphill and downhill.
4.2-III. DISCUSSION
The Stopping Distance phase of the Brake Test was completed with the following
results; for the Uniform High Friction Test average stopping distances were ??.??’ at 20
mph, ??.??’ at 30 mph, ??.??’ at 40 mph and ??.??’ at 45 mph. The average stopping
distance for the Uniform Low Friction Test was ??.??’ There was no deviation from the
test lane during the performance of the Stopping Distance phase.
During the Stability phase of Brake Testing the test bus experienced no deviation
from the test lane but did experience pull to the left during both approaches to the Split
Friction Road surface.
The Parking Brake phase was completed with the test bus maintaining the parked
position for the full five minute period with no slip or roll observed in both the uphill and
downhill positions.
Page 40 of 112
Table 4.2-6. Braking Test Data Forms
Page 1 of 3
Bus Number:
Date:
Personnel:
Amb. Temperature (oF):
Wind Speed (mph):
Wind Direction:
Pavement Temp (°F) Start:
End:
TIRE INFLATION PRESSURE (psi):
Tire Type: Front:
Rear:
Left Tire(s)
Right Tire(s)
Front
Inner
Outer
Inner
Outer
Rear
Rear
AXLE LOADS (lb)
Left
Right
Front
Rear
FINAL INSPECTION
Bus Number:
Date:
Personnel:
Page 41 of 112
Table 4.2-7. Record of All Braking System Faults/Repairs.
Page 2 of 3
Date
Personnel
Fault/Repair
Page 42 of 112
Description
Table 4.2-8.1. Stopping Distance Test Results Form
Page 3 or 3
Stopping Distance (ft)
Vehicle
Direction
Speed (mph)
CW
Stop 1
CW
Stop 2
CCW
Stop 3
CCW
Stop 4
Average
20 (dry)
30 (dry)
40 (dry)
45 (dry)
20 (wet)
Table 4.2-8.2. Stability Test Results Form
Stability Test Results (Split Friction Road surface)
Vehicle
Direction
Attempt
Did test bus stay in 12’ lane?
(Yes/No)
1
CW
2
1
CCW
2
Table 4.2-8.3. Parking Brake Test Form
PARKING BRAKE (Fully Loaded) – GRADE HOLDING
Vehicle
Direction
Attempt
Hold
Time (min)
Slide
(in)
1
Front up
2
3
1
Front
down
2
3
Page 43 of 112
Roll
(in)
Did
Hold
No
Hold
5.1
STRUCTURAL INTEGRITY
5.1 STRUCTURAL STRENGTH AND DISTORTION TESTS –
STRUCTURAL SHAKEDOWN TEST
5.1-I. DISCUSSION
The objective of this test is to determine certain static characteristics (e.g., bus
floor deflection, permanent structural deformation, etc.) under static loading conditions.
5.1-II. TEST DESCRIPTION
In this test, the bus will be isolated from the suspension by blocking the vehicle
under the suspension points. The bus will then be loaded and unloaded up to a
maximum of three times with a distributed load equal to 2.5 times gross load. Gross
load is 150 lb for every designed passenger seating position, for the driver, and for each
1.5 sq ft of free floor space. For a distributed load equal to 2.5 times gross load, place a
375-lb load on each seat and on every 1.5 sq ft of free floor space. The first loading
and unloading sequence will “settle” the structure. Bus deflection will be measured at
several locations during the loading sequences.
5.1-III. DISCUSSION
This test was performed based on a maximum passenger capacity of ?? people
including the driver. The resulting test load is (?? X 375 lb) = ??,??? lbs. The load is
distributed evenly over the passenger space. Deflection data before and after each
loading and unloading sequence is provided on the Structural Shakedown Data Form.
The unloaded height after each test becomes the original height for the next test.
Some initial settling is expected due to undercoat compression, etc. After each loading
cycle, the deflection of each reference point is determined. The bus is then unloaded
and the residual (permanent) deflection is recorded. On the final test, the maximum
loaded deflection was 0.??? Inches at reference point ?. The maximum permanent
deflection after the final loading sequence ranged from 0.??? Inches at reference points
?, ?, and ? to 0.??? Inches at reference points ? and ??.
Page 44 of 112
STRUCTURAL SHAKEDOWN DATA FORM
Page 1 of 2
Bus Number:
Date:
Personnel:
Temperature (°F):
Loading Sequence:
Test Load (lbs):
■1
□2
□3
(check one)
Indicate Approximate Location of Each Reference Point
Right
Front
of
Bus
Left
Top View
Reference
Point No.
A (in)
Original
Height
1
0
2
0
3
0
4
0
5
0
6
0
7
0
8
0
9
0
10
0
11
0
12
0
B (in)
Loaded
Height
B-A (in)
Loaded
Deflection
Page 45 of 112
C (in)
Unloaded
Height
C-A (in)
Permanent
Deflection
STRUCTURAL SHAKEDOWN DATA FORM
Page 2 of 2
Bus Number:
Date:
Personnel:
Temperature (°F):
Loading Sequence:
Test Load (lbs):
□1
■2
□3
(check one)
Indicate Approximate Location of Each Reference Point
Right
Front
of
Bus
Left
Top View
Reference
Point No.
A (in)
Original
Height
B (in)
Loaded
Height
B-A (in)
Loaded
Deflection
1
2
3
4
5
6
7
8
9
10
11
12
Page 46 of 112
C (in)
Unloaded
Height
C-A (in)
Permanent
Deflection
5.1 STRUCTURAL SHAKEDOWN TEST
DIAL INDICATORS IN POSITION
BUS LOADED TO 2.5 TIMES GVL
(23,250 LBS)
Page 47 of 112
5.2 STRUCTURAL STRENGTH AND DISTORTION
TESTS - STRUCTURAL DISTORTION
5.2-I. TEST OBJECTIVE
The objective of this test is to observe the operation of the bus subsystems when
the bus is placed in a longitudinal twist simulating operation over a curb or through a
pothole.
5.2-II. TEST DESCRIPTION
With the bus loaded to GVWR, each wheel of the bus will be raised (one at a
time) to simulate operation over a curb and the following will be inspected:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Body
Windows
Doors
Roof vents
Special seating
Undercarriage
Engine
Service doors
Escape hatches
Steering mechanism
Each wheel will then be lowered (one at a time) to simulate operation through a pothole
and the same items inspected.
5.2-III. DISCUSSION
The test sequence was repeated ten times. The first and last test is with all
wheels level. The other eight tests are with each wheel 6 inches higher and 6 inches
lower than the other three wheels.
All doors, windows, escape mechanisms, engine, steering and handicapped
devices operated normally throughout the test. The undercarriage and body indicated
no deficiencies. No water leakage was observed during the test. The results of this test
are indicated on the following data forms.
Page 48 of 112
DISTORTION TEST INSPECTION FORM
(Note: Ten copies of this data sheet are required)
Page 1 of 10
Bus Number:
Date:
Personnel:
Temperature(°F):
Wheel Position : (check one)
All wheels level
■
before
□
after
Left front
□
6 in higher
□
6 in lower
Right front
□
6 in higher
□
6 in lower
Right rear
□
6 in higher
□
6 in lower
Left rear
□
6 in higher
□
6 in lower
Right center
□
6 in higher
□
6 in lower
Left center
□
6 in higher
□
6 in lower
Comments
■
Windows
No deficiencies.
■
Front Doors
No deficiencies.
■
Rear Doors
No deficiencies.
■
Escape Mechanisms/ Roof Vents
No deficiencies.
■
Engine
No deficiencies.
■
Handicapped Device/ Special
Seating
No deficiencies.
■
Undercarriage
No deficiencies.
■
Service Doors
No deficiencies.
■
Body
No deficiencies.
■
Windows/ Body Leakage
No deficiencies.
■
Steering Mechanism
No deficiencies.
Page 49 of 112
DISTORTION TEST INSPECTION FORM
(Note: Ten copies of this data sheet are required)
Page 2 of 10
Bus Number:
Date:
Personnel:
Temperature(°F):
Wheel Position : (check one)
All wheels level
□
before
□
after
Left front
■
6 in higher
□
6 in lower
Right front
□
6 in higher
□
6 in lower
Right rear
□
6 in higher
□
6 in lower
Left rear
□
6 in higher
□
6 in lower
Right center
□
6 in higher
□
6 in lower
Left center
□
6 in higher
□
6 in lower
Comments
■
Windows
No deficiencies.
■
Front Doors
No deficiencies.
■
Rear Doors
No deficiencies.
■
Escape Mechanisms/ Roof Vents
No deficiencies.
■
Engine
No deficiencies.
■
Handicapped Device/ Special
Seating
No deficiencies.
■
Undercarriage
No deficiencies.
■
Service Doors
No deficiencies.
■
Body
No deficiencies.
■
Windows/ Body Leakage
No deficiencies.
■
Steering Mechanism
No deficiencies.
Page 50 of 112
DISTORTION TEST INSPECTION FORM
(Note: Ten copies of this data sheet are required)
Page 3 of 10
Bus Number:
Date:
Personnel:
Temperature(°F):
Wheel Position : (check one)
All wheels level
□
before
□
after
Left front
□
6 in higher
□
6 in lower
Right front
■
6 in higher
□
6 in lower
Right rear
□
6 in higher
□
6 in lower
Left rear
□
6 in higher
□
6 in lower
Right center
□
6 in higher
□
6 in lower
Left center
□
6 in higher
□
6 in lower
Comments
■
Windows
No deficiencies.
■
Front Doors
No deficiencies.
■
Rear Doors
No deficiencies.
■
Escape Mechanisms/ Roof Vents
No deficiencies.
■
Engine
No deficiencies.
■
Handicapped Device/ Special
Seating
No deficiencies.
■
Undercarriage
No deficiencies.
■
Service Doors
No deficiencies.
■
Body
No deficiencies.
■
Windows/ Body Leakage
No deficiencies.
■
Steering Mechanism
No deficiencies.
Page 51 of 112
DISTORTION TEST INSPECTION FORM
(Note: Ten copies of this data sheet are required)
Page 4 of 10
Bus Number:
Date:
Personnel:
Temperature(°F):
Wheel Position : (check one)
All wheels level
□
before
□
after
Left front
□
6 in higher
□
6 in lower
Right front
□
6 in higher
□
6 in lower
Right rear
■
6 in higher
□
6 in lower
Left rear
□
6 in higher
□
6 in lower
Right center
□
6 in higher
□
6 in lower
Left center
□
6 in higher
□
6 in lower
Comments
■
Windows
No deficiencies.
■
Front Doors
No deficiencies.
■
Rear Doors
No deficiencies.
■
Escape Mechanisms/ Roof Vents
No deficiencies.
■
Engine
No deficiencies.
■
Handicapped Device/ Special
Seating
No deficiencies.
■
Undercarriage
No deficiencies.
■
Service Doors
No deficiencies.
■
Body
No deficiencies.
■
Windows/ Body Leakage
No deficiencies.
■
Steering Mechanism
No deficiencies.
Page 52 of 112
DISTORTION TEST INSPECTION FORM
(Note: Ten copies of this data sheet are required)
Page 5 of 10
Bus Number:
Date:
Personnel:
Temperature(°F):
Wheel Position : (check one)
All wheels level
□
before
□
after
Left front
□
6 in higher
□
6 in lower
Right front
□
6 in higher
□
6 in lower
Right rear
□
6 in higher
□
6 in lower
Left rear
■
6 in higher
□
6 in lower
Right center
□
6 in higher
□
6 in lower
Left center
□
6 in higher
□
6 in lower
Comments
■
Windows
No deficiencies.
■
Front Doors
No deficiencies.
■
Rear Doors
No deficiencies.
■
Escape Mechanisms/ Roof Vents
No deficiencies.
■
Engine
No deficiencies.
■
Handicapped Device/ Special
Seating
No deficiencies.
■
Undercarriage
No deficiencies.
■
Service Doors
No deficiencies.
■
Body
No deficiencies.
■
Windows/ Body Leakage
No deficiencies.
■
Steering Mechanism
No deficiencies.
Page 53 of 112
DISTORTION TEST INSPECTION FORM
(Note: Ten copies of this data sheet are required)
Page 6 of 10
Bus Number:
Date:
Personnel:
Temperature(°F):
Wheel Position : (check one)
All wheels level
□
before
□
after
Left front
□
6 in higher
■
6 in lower
Right front
□
6 in higher
□
6 in lower
Right rear
□
6 in higher
□
6 in lower
Left rear
□
6 in higher
□
6 in lower
Right center
□
6 in higher
□
6 in lower
Left center
□
6 in higher
□
6 in lower
Comments
■
Windows
No deficiencies.
■
Front Doors
No deficiencies.
■
Rear Doors
No deficiencies.
■
Escape Mechanisms/ Roof Vents
No deficiencies.
■
Engine
No deficiencies.
■
Handicapped Device/ Special
Seating
No deficiencies.
■
Undercarriage
No deficiencies.
■
Service Doors
No deficiencies.
■
Body
No deficiencies.
■
Windows/ Body Leakage
No deficiencies.
■
Steering Mechanism
No deficiencies.
Page 54 of 112
DISTORTION TEST INSPECTION FORM
(Note: Ten copies of this data sheet are required)
Page 7 of 10
Bus Number:
Date:
Personnel:
Temperature(°F):
Wheel Position : (check one)
All wheels level
□
before
□
after
Left front
□
6 in higher
□
6 in lower
Right front
□
6 in higher
■
6 in lower
Right rear
□
6 in higher
□
6 in lower
Left rear
□
6 in higher
□
6 in lower
Right center
□
6 in higher
□
6 in lower
Left center
□
6 in higher
□
6 in lower
Comments
■
Windows
No deficiencies.
■
Front Doors
No deficiencies.
■
Rear Doors
No deficiencies.
■
Escape Mechanisms/ Roof Vents
No deficiencies.
■
Engine
No deficiencies.
■
Handicapped Device/ Special
Seating
No deficiencies.
■
Undercarriage
No deficiencies.
■
Service Doors
No deficiencies.
■
Body
No deficiencies.
■
Windows/ Body Leakage
No deficiencies.
■
Steering Mechanism
No deficiencies.
Page 55 of 112
DISTORTION TEST INSPECTION FORM
(Note: Ten copies of this data sheet are required)
Page 8 of 10
Bus Number:
Date:
Personnel:
Temperature(°F):
Wheel Position : (check one)
All wheels level
□
before
□
after
Left front
□
6 in higher
□
6 in lower
Right front
□
6 in higher
□
6 in lower
Right rear
□
6 in higher
■
6 in lower
Left rear
□
6 in higher
□
6 in lower
Right center
□
6 in higher
□
6 in lower
Left center
□
6 in higher
□
6 in lower
Comments
■
Windows
No deficiencies.
■
Front Doors
No deficiencies.
■
Rear Doors
No deficiencies.
■
Escape Mechanisms/ Roof Vents
No deficiencies.
■
Engine
No deficiencies.
■
Handicapped Device/ Special
Seating
No deficiencies.
■
Undercarriage
No deficiencies.
■
Service Doors
No deficiencies.
■
Body
No deficiencies.
■
Windows/ Body Leakage
No deficiencies.
■
Steering Mechanism
No deficiencies.
Page 56 of 112
DISTORTION TEST INSPECTION FORM
(Note: Ten copies of this data sheet are required)
Page 9 of 10
Bus Number:
Date:
Personnel:
Temperature(°F):
Wheel Position : (check one)
All wheels level
□
before
□
after
Left front
□
6 in higher
□
6 in lower
Right front
□
6 in higher
□
6 in lower
Right rear
□
6 in higher
□
6 in lower
Left rear
□
6 in higher
■
6 in lower
Right center
□
6 in higher
□
6 in lower
Left center
□
6 in higher
□
6 in lower
Comments
■
Windows
No deficiencies.
■
Front Doors
No deficiencies.
■
Rear Doors
No deficiencies.
■
Escape Mechanisms/ Roof Vents
No deficiencies.
■
Engine
No deficiencies.
■
Handicapped Device/ Special
Seating
No deficiencies.
■
Undercarriage
No deficiencies.
■
Service Doors
No deficiencies.
■
Body
No deficiencies.
■
Windows/ Body Leakage
No deficiencies.
■
Steering Mechanism
No deficiencies.
Page 57 of 112
DISTORTION TEST INSPECTION FORM
(Note: Ten copies of this data sheet are required)
Page 10 of 10
Bus Number:
Date:
Personnel:
Temperature(°F):
Wheel Position : (check one)
All wheels level
□
before
■
after
Left front
□
6 in higher
□
6 in lower
Right front
□
6 in higher
□
6 in lower
Right rear
□
6 in higher
□
6 in lower
Left rear
□
6 in higher
□
6 in lower
Right center
□
6 in higher
□
6 in lower
Left center
□
6 in higher
□
6 in lower
Comments
■
Windows
No deficiencies.
■
Front Doors
No deficiencies.
■
Rear Doors
No deficiencies.
■
Escape Mechanisms/ Roof Vents
No deficiencies.
■
Engine
No deficiencies.
■
Handicapped Device/ Special
Seating
No deficiencies.
■
Undercarriage
No deficiencies
■
Service Doors
No deficiencies.
■
Body
No deficiencies.
■
Windows/ Body Leakage
No deficiencies.
■
Steering Mechanism
No deficiencies.
Page 58 of 112
5.2 STRUCTURAL DISTORTION TEST
RIGHT FRONT WHEEL SIX INCHES HIGHER
LEFT FRONT WHEEL SIX INCHES LOWER
Page 59 of 112
5.3 STRUCTURAL STRENGTH AND DISTORTION
TESTS - STATIC TOWING TEST
5.3-I. TEST OBJECTIVE
The objective of this test is to determine the characteristics of the bus towing
mechanisms under static loading conditions.
5.3-II. TEST DESCRIPTION
Utilizing a load-distributing yoke, a hydraulic cylinder is used to apply a static
tension load equal to 1.2 times the bus curb weight. The load will be applied to both the
front and rear, if applicable, towing fixtures at an angle of 20 degrees with the
longitudinal axis of the bus, first to one side then the other in the horizontal plane, and
then upward and downward in the vertical plane. Any permanent deformation or
damage to the tow eyes or adjoining structure will be recorded.
5.3-III. DISCUSSION
The load-distributing yoke was incorporated as the interface between the Static
Tow apparatus and the test bus tow hook/eyes. The test was performed to the full
target test weight of ??,??? lbs (1.2 x ??,??? lbs CW). No damage or deformation was
observed during all four pulls of the test.
Page 60 of 112
STATIC TOWING TEST DATA FORM
Page 1 of 1
Bus Number:
Date:
Personnel:
Temperature (°F):
Digital read-out
Start:
End:
Inspect right front tow eye and adjoining structure.
Comments:
Check the torque of all bolts attaching tow eye and surrounding structure.
Comments:
Inspect left tow eye and adjoining structure.
Comments:
Check the torque of all bolts attaching tow eye and surrounding structure.
Comments:
Inspect right rear tow eye and adjoining structure.
Comments:
Check the torque of all bolts attaching tow eye and surrounding structure.
Comments:
Inspect left rear tow eye and adjoining structure.
Comments:
Check the torque of all bolts attaching tow eye and surrounding structure.
Comments:
General comments of any other structure deformation or failure:
Page 61 of 112
5.3 STATIC TOWING TEST
FRONT 20° UPWARD PULL
TEST TERMINATED AT APPROXIMATELY 10,000 LBS
WHEN THE SUPPORT STRUCTURE BENT DOWN AND
FORWARD
Page 62 of 112
5.3 STATIC TOWING TEST CONT.
REAR 20° UPWARD PULL
TEST TERMINATED AT APPROXIMATELY 9,000 LBS
WHEN THE REAR BUMPER ASSEMBLY DEFORMED
UPWARD
Page 63 of 112
5.4 STRUCTURAL STRENGTH AND DISTORTION TESTS DYNAMIC TOWING TEST
5.4-I. TEST OBJECTIVE
The objective of this test is to verify the integrity of the towing fixtures and
determine the feasibility of towing the bus under manufacturer specified procedures.
5.4-II. TEST DESCRIPTION
This test requires the bus be towed at curb weight using the specified equipment
and instructions provided by the manufacturer and a heavy-duty wrecker. The bus will
be towed for 5 miles at a speed of 20 mph for each recommended towing configuration.
After releasing the bus from the wrecker, the bus will be visually inspected for any
structural damage or permanent deformation. All doors, windows and passenger
escape mechanisms will be inspected for proper operation.
5.4-III. DISCUSSION
The bus was towed using a heavy-duty wrecker. The towing interface was
accomplished by incorporating a hydraulic under lift. A front lift tow was performed.
Rear towing is not recommended. No problems, deformation, or damage was noted
during testing.
Page 64 of 112
DYNAMIC TOWING TEST DATA FORM
Page 1 of 1
Bus Number:
Date:
Personnel:
Temperature (°F):
Humidity (%):
Wind Direction:
Wind Speed (mph):
Barometric Pressure (in.Hg):
Inspect tow equipment-bus interface.
Comments:
Inspect tow equipment-wrecker interface.
Comments:
Towing Comments:
Description and location of any structural damage:
General Comments:
Page 65 of 112
5.4 DYNAMIC TOWING TEST
TOWING INTERFACE
TEST BUS IN TOW
Page 66 of 112
5.5 STRUCTURAL STRENGTH AND DISTORTION
TESTS – JACKING TEST
5.5-I. TEST OBJECTIVE
The objective of this test is to inspect for damage due to the deflated tire, and
determine the feasibility of jacking the bus with a portable hydraulic jack to a height
sufficient to replace a deflated tire.
5.5-II. TEST DESCRIPTION
With the bus at curb weight, the tire(s) at one corner of the bus are replaced with
deflated tire(s) of the appropriate type. A portable hydraulic floor jack is then positioned
in a manner and location specified by the manufacturer and used to raise the bus to a
height sufficient to provide 3-in clearance between the floor and an inflated tire. The
deflated tire(s) are replaced with the original tire(s) and the jack is lowered. Any
structural damage or permanent deformation is recorded on the test data sheet. This
procedure is repeated for each corner of the bus.
5.5-III. DISCUSSION
The jack used for this test has a minimum height of 8.75 inches. During the
deflated portion of the test, the jacking point clearances ranged from ?.? inches to ??.?
inches. No deformation or damage was observed during testing. A complete listing of
jacking point clearances is provided in the Jacking Test Data Form.
JACKING CLEARANCE SUMMARY
Condition
Frame Point Clearance
Front axle – one tire flat
??.?”
Rear axle – one tire flat
??.?”
Rear axle – two tires flat
??.?”
Page 67 of 112
JACKING TEST DATA FORM
Page 1 of 1
Bus Number:
Date:
Personnel:
Temperature (°F):
Record any permanent deformation or damage to bus as well as any difficulty
encountered during jacking procedure.
Deflated
Tire
Right front
Jacking Pad
Clearance
Body/Frame
(in)
??.??“ I
??.??“ D
Jacking Pad
Clearance
Axle/Suspension
(in)
??.??“ I
??.??” D
Left front
??.??“ I
??.??“ D
??.??“ I
??.??“ D
Right rear—outside
??.??“ I
??.??“ D
??.??“ I
??.??“ D
Right rear—both
??.??“ I
??.??“ D
??.??“ I
??.??“ D
Left rear—outside
??.??“ I
??.??“ D
??.??“ I
??.??“ D
Left rear—both
??.??“ I
??.??“ D
??.??“ I
??.??“ D
Right middle or
tag—outside
NA
NA
Right middle or
tag—both
NA
NA
Left middle or tag—
outside
NA
NA
Left middle or tag—
both
NA
NA
Comments
Additional comments of any deformation or difficulty during jacking:
Page 68 of 112
5.6 STRUCTURAL STRENGTH AND DISTORTION
TESTS - HOISTING TEST
5.6-I. TEST OBJECTIVE
The objective of this test is to determine possible damage or deformation caused
by the jack/stands.
5.6-II. TEST DESCRIPTION
With the bus at curb weight, the front end of the bus is raised to a height sufficient
to allow manufacturer-specified placement of jack stands under the axles or jacking
pads independent of the hoist system. The bus will be checked for stability on the jack
stands and for any damage to the jacking pads or bulkheads. The procedure is
repeated for the rear end of the bus. The procedure is then repeated for the front and
rear simultaneously.
5.6-III. DISCUSSION
The test was conducted using four posts of a six-post electric lift and standard 19
inch jack stands. The bus was hoisted from the front wheel, rear wheel, and then the
front and rear wheels simultaneously and placed on jack stands.
The bus easily accommodated the placement of the vehicle lifts and jack stands
and the procedure was performed without any instability noted.
Page 69 of 112
HOISTING TEST DATA FORM
Page 1 of 1
Bus Number:
Date:
Personnel:
Temperature (°F):
Comments of any structural damage to the jacking pads or axles while both
the front wheels are supported by the jack stands:
None noted.
Comments of any structural damage to the jacking pads or axles while both
the rear wheels are supported by the jack stands:
None noted.
Comments of any structural damage to the jacking pads or axles while both
the front and rear wheels are supported by the jack stands:
None noted.
Page 70 of 112
5.7 STRUCTURAL DURABILITY TEST
5.7-I. TEST OBJECTIVE
The objective of this test is to perform an accelerated durability test that
approximates up to 25 percent of the service life of the vehicle.
5.7-II. TEST DESCRIPTION
The test vehicle is driven a total of ??,??? miles; approximately ??,??? miles on the
PSBRTF Durability Test Track and approximately ?,??? miscellaneous other miles. The
test will be conducted with the bus operated under three different loading conditions. The
first segment will consist of approximately ?,??? miles with the bus operated at GVW. The
second segment will consist of approximately ?,??? miles with the bus operated at SLW.
The remainder of the test, approximately ?,??? miles, will be conducted with the bus loaded
to CW. If GVW exceeds the axle design weights, then the load will be adjusted to the axle
design weights and the change will be recorded. All subsystems are run during these tests
in their normal operating modes. All recommended manufacturers servicing is to be
followed and noted on the vehicle maintainability log. Servicing items accelerated by the
durability tests will be compressed by 10:1; all others will be done on a 1:1 mi/mi basis.
Unscheduled breakdowns and repairs are recorded on the same log as are any unusual
occurrences as noted by the driver. Once a week the test vehicle shall be washed down
and thoroughly inspected for any signs of failure.
5.7-III. DISCUSSION
The Structural Durability Test was started on ???? ??, 2002 and was conducted until
???? ??, 2002. The first ?,??? miles were performed at a GVW of ??,??? lbs. and
completed on ???? ??, 2002. The next ?,??? mile SLW segment was performed at ??,???
lbs and completed on ???? ??, 2002, and the final ?,??? mile segment was performed at a
CW of ??,??? lbs and completed on ???? ??, 20021.
The following mileage summary presents the accumulation of miles during the
Structural Durability Test. The driving schedule is included, showing the operating duty
cycle. A detailed plan view of the Test Track Facility and Durability Test Track are attached
for reference. Also, a durability element profile detail shows all the measurements of the
different conditions. Finally, photographs illustrating some of the failures that were
encountered during the Structural Durability Test are included.
Page 71 of 112
Drivers Log Mileage
Page 72 of 112
Page 73 of 112
Page 74 of 112
Page 75 of 112
Page 76 of 112
UNSCHEDULED MAINTENANCE
?
Page 77 of 112
UNSCHEDULED MAINTENANCE
?
Page 78 of 112
UNSCHEDULED MAINTENANCE
BROKEN AND LOOSE FRONT AXLE BOLTS
(2,645 TEST MILES)
FRAYED ENGINE ACCESSORY BELT
(2,645 TEST MILES)
Page 79 of 112
UNSCHEDULED MAINTENANCE CONT.
CRACKED LEFT REAR SPRING HANGER PAD
(6,505 TEST MILES)
BROKEN RIGHT FRONT SPRING BEAM
(6,534 TEST MILES)
Page 80 of 112
UNSCHEDULED MAINTENANCE CONT.
CRACKED RIGHT REAR SUSPENSION SUPPORT
BRACKET
(6,649 TEST MILES)
BROKEN REAR LEVELING VALVE
(8,395 TEST MILES)
Page 81 of 112
UNSCHEDULED MAINTENANCE CONT.
NEW AXLE ALIGNMENT BLOCKS REQUESTED BY
MANUFACTURER
(11,502 TEST MILES)
Page 82 of 112
6. FUEL ECONOMY TEST - A FUEL CONSUMPTION
TEST USING AN APPROPRIATE OPERATING CYCLE
6-I. TEST OBJECTIVE
The objective of this test is to provide accurate comparable fuel consumption data
on transit buses produced by different manufacturers. This fuel economy test bears no
relation to the calculations done by the Environmental Protection Agency (EPA) to
determine levels for the Corporate Average Fuel Economy Program. EPA's calculations
are based on tests conducted under laboratory conditions intended to simulate city and
highway driving. This fuel economy test, as designated here, is a measurement of the
fuel expended by a vehicle traveling a specified test loop under specified operating
conditions. The results of this test will not represent actual mileage but will provide data
that can be used by recipients to compare buses tested by this procedure.
6-II. TEST DESCRIPTION
This test requires operation of the bus over a course based on the Transit Coach
Operating Duty Cycle (ADB Cycle) at seated load weight using a procedure based on
the Fuel Economy Measurement Test (Engineering Type) For Trucks and Buses: SAE
1376 July 82. The procedure has been modified by elimination of the control vehicle
and by modifications as described below. The inherent uncertainty and expense of
utilizing a control vehicle over the operating life of the facility is impractical.
The fuel economy test will be performed as soon as possible (weather permitting)
after the completion of the GVW portion of the structural durability test. It will be
conducted on the bus test lane at the Penn State Test Facility. Signs are erected at
carefully measured points which delineate the test course. A test run will comprise 3
CBD phases, 2 Arterial phases, and 1 Commuter phase. An electronic fuel measuring
system will indicate the amount of fuel consumed during each phase of the test. The
test runs will be repeated until there are at least two runs in both the clockwise and
counterclockwise directions in which the fuel consumed for each run is within ± 4
percent of the average total fuel used over the 4 runs. A 20-minute idle consumption
test is performed just prior to and immediately after the driven portion of the fuel
economy test. The amount of fuel consumed while operating at normal/low idle is
recorded on the Fuel Economy Data Form. This set of four valid runs along with idle
consumption data comprise a valid test.
Page 83 of 112
The test procedure is the ADB cycle with the following four modifications:
1.
The ADB cycle is structured as a set number of miles in a fixed time in the
following order: CBD, Arterial, CBD, Arterial, CBD, and Commuter. A
separate idle fuel consumption measurement is performed at the beginning
and end of the fuel economy test. This phase sequence permits the reporting
of fuel consumption for each of these phases separately, making the data
more useful to bus manufacturers and transit properties.
2.
The operating profile for testing purposes shall consist of simulated transit
type service at seated load weight. The three test phases (figure 6-1) are: a
central business district (CBD) phase of 2 miles with 7 stops per mile and a
top speed of 20 mph; an arterial phase of 2 miles with 2 stops per mile and a
top speed of 40 mph; and a commuter phase of 4 miles with 1 stop and a
maximum speed of 40 mph. At each designated stop the bus will remain
stationary for seven seconds. During this time, the passenger doors shall be
opened and closed.
3.
The individual ADB phases remain unaltered with the exception that 1 mile
has been changed to 1 lap on the Penn State Test Track. One lap is equal to
5,042 feet. This change is accommodated by adjusting the cruise distance
and time.
4.
The acceleration profile, for practical purposes and to achieve better
repeatability, has been changed to "full throttle acceleration to cruise
speed".
Several changes were made to the Fuel Economy Measurement Test
(Engineering Type) For Trucks and Buses: SAE 1376 July 82:
1. Sections 1.1, and 1.2 only apply to diesel, gasoline, methanol, and any other
fuel in the liquid state (excluding cryogenic fuels).
1.1
SAE 1376 July 82 requires the use of at least a 16-gal fuel tank. Such
a fuel tank when full would weigh approximately 160 lb. It is judged that a 12-gal tank
weighing approximately 120 lb will be sufficient for this test and much easier for the
technician and test personnel to handle.
Page 84 of 112
1.2
SAE 1376 July 82 mentions the use of a mechanical scale or a flow
meter system. This test procedure uses a load cell readout combination that provides
an accuracy of 0.5 percent in weight and permits on-board weighing of the gravimetric
tanks at the end of each phase. This modification permits the determination of a fuel
economy value for each phase as well as the overall cycle.
2. Section 2.1 applies to compressed natural gas (CNG), liquefied natural gas
(LNG), cryogenic fuels, and other fuels in the vapor state.
2.1
A laminar type flow meter will be used to determine the fuel
consumption. The pressure and temperature across the flow element will be monitored
by the flow computer. The flow computer will use this data to calculate the gas flow
rate. The flow computer will also display the flow rate (scfm) as well as the total fuel
used (scf). The total fuel used (scf) for each phase will be recorded on the Fuel
Economy Data Form.
3. Use both Sections 1 and 2 for dual fuel systems.
FUEL ECONOMY CALCULATION PROCEDURE
A. For diesel, gasoline, methanol and fuels in the liquid state.
The reported fuel economy is based on the following: measured test quantities-distance traveled (miles) and fuel consumed (pounds); standard reference values-density of water at 60°F (8.3373 lbs/gal) and volumetric heating value of standard fuel;
and test fuel specific gravity (unitless) and volumetric heating value (BTU/gal). These
combine to give a fuel economy in miles per gallon (mpg) which is corrected to a
standard gallon of fuel referenced to water at 60°F. This eliminates fluctuations in fuel
economy due to fluctuations in fuel quality. This calculation has been programmed into
a computer and the data processing is performed automatically.
The fuel economy correction consists of three steps:
1.)
Divide the number of miles of the phase by the number of pounds of fuel
consumed
total miles
phase
miles per phase
per run
CBD
1.9097
5.7291
ART
1.9097
3.8193
COM
3.8193
3.8193
FEomi/lb = Observed fuel economy =
miles
lb of fuel
Page 85 of 112
2.)
Convert the observed fuel economy to miles per gallon [mpg] by multiplying
by the specific gravity of the test fuel Gs (referred to water) at 60°F and
multiply by the density of water at 60°F
FEompg = FEcmi/lb x Gs x Gw
where
3.)
Gs = Specific gravity of test fuel at 60°F (referred to water)
Gw = 8.3373 lb/gal
Correct to a standard gallon of fuel by dividing by the volumetric heating
value of the test fuel (H) and multiplying by the volumetric heating value of
standard reference fuel (Q). Both heating values must have the same units.
FEc = FEompg x Q
H
where
H = Volumetric heating value of test fuel [BTU/gal]
Q = Volumetric heating value of standard reference fuel
Combining steps 1-3 yields
==> FEc = miles x (Gs x Gw) x Q
lbs
H
4.)
Covert the fuel economy from mpg to an energy equivalent of miles per
BTU. Since the number would be extremely small in magnitude, the energy
equivalent will be represented as miles/BTUx106.
Eq = Energy equivalent of converting mpg to mile/BTUx106.
Eq = ((mpg)/(H))x106
B. CNG, LNG, cryogenic and other fuels in the vapor state.
The reported fuel economy is based on the following: measured test quantities-distance traveled (miles) and fuel consumed (scf); density of test fuel, and volumetric
heating value (BTU/lb) of test fuel at standard conditions (P=14.73 psia and T=60 ΕF).
These combine to give a fuel economy in miles per lb. The energy equivalent
Page 86 of 112
(mile/BTUx106) will also be provided so that the results can be compared to buses that
use other fuels.
1.)
Divide the number of miles of the phase by the number of standard cubic
feet (scf) of fuel consumed.
total miles
phase
miles per phase
per run
CBD
1.9097
5.7291
ART
1.9097
3.8193
COM
3.8193
3.8193
FEomi/scf = Observed fuel economy =
2.)
miles
scf of fuel
Convert the observed fuel economy to miles per lb by dividing FEo by the
density of the test fuel at standard conditions (Lb/ft3).
Note: The density of test fuel must be determined at standard
conditions as described above. If the density is not defined at the
above standard conditions, then a correction will be needed before the
fuel economy can be calculated.
FEomi/lb = FEo / Gm
where Gm = Density of test fuel at standard conditions
3.)
Convert the observed fuel economy (FEomi/lb) to an energy equivalent of
(miles/BTUx106) by dividing the observed fuel economy (FEomi/lb) by the
heating value of the test fuel at standard conditions.
Eq = ((FEomi/lb)/H)x106
where
Eq = Energy equivalent of miles/lb to mile/BTUx106
H = Volumetric heating value of test fuel at standard conditions
Page 87 of 112
6-III. DISCUSSION
This is a comparative test of fuel economy using ??? fuel with a heating value of
1,008.1 btu/lb. The driving cycle consists of Central Business District (CBD), Arterial
(ART), and Commuter (COM) phases as described in 6-II. The fuel consumption for
each driving cycle and for idle is measured separately. The results are corrected to a
reference fuel with a volumetric heating value of 126,700.0 btu/gal.
An extensive pretest maintenance check is made including the replacement of all
lubrication fluids. The details of the pretest maintenance are given in the first three
Pretest Maintenance Forms. The fourth sheet shows the Pretest Inspection. The next
sheet shows the correction calculation for the test fuel. The next four Fuel Economy
Forms provide the data from the four test runs. Finally, the summary sheet provides the
average fuel consumption. The overall average is based on total fuel and total mileage
for each phase. The overall average fuel consumption values were; CBD - ? M/lb, ART
- ? M/lb, and COM - ? M/lb. Average fuel consumption at idle was ?.?? lb/hr (?.??
scf/hr).
Page 88 of 112
FUEL ECONOMY PRE-TEST MAINTENANCE FORM
Page 1 of 3
Bus Number:
Date:
SLW (lbs):
Personnel:
FUEL SYSTEM
OK
Install fuel measurement system
Replace fuel filter
Check for fuel leaks
Date
Initials
Date
Initials
Date
Initials
Specify fuel type (refer to fuel analysis)
Remarks:
BRAKES/TIRES
OK
Inspect hoses
Inspect brakes
Relube wheel bearings
Check tire inflation pressures (mfg. specs.)
Remarks:
COOLING SYSTEM
OK
Check hoses and connections
Check system for coolant leaks
Remarks:
Page 89 of 112
FUEL ECONOMY PRE-TEST MAINTENANCE FORM
Page 2 of 3
Bus Number:
Date:
Personnel:
ELECTRICAL SYSTEMS
OK
Check battery
Inspect wiring
Inspect terminals
Check lighting
Date
Initials
Date
Initials
Date
Initials
Remarks:
DRIVE SYSTEM
OK
Drain transmission fluid
Replace filter/gasket
Check hoses and connections
Replace transmission fluid
Check for fluid leaks
Remarks:
LUBRICATION
OK
Drain crankcase oil
Replace filters
Replace crankcase oil
Check for oil leaks
Check oil level
Lube all chassis grease fittings
Lube universal joints
Replace differential lube including axles
Remarks:
Page 90 of 112
FUEL ECONOMY PRE-TEST MAINTENANCE FORM
Page 3 of 3
Bus Number:
Date:
Personnel:
EXHAUST/EMISSION SYSTEM
OK
Date
Initials
Date
Initials
Date
Initials
Date
Initials
Date
Initials
Check for exhaust leaks
Remarks:
ENGINE
OK
Replace air filter
Inspect air compressor and air system
Inspect vacuum system, if applicable
Check and adjust all drive belts
Check cold start assist, if applicable
Remarks:
STEERING SYSTEM
OK
Check power steering hoses and connectors
Service fluid level
Check power steering operation
Remarks:
OK
Ballast bus to seated load weight
TEST DRIVE
OK
Check brake operation
Check transmission operation
Remarks:
Page 91 of 112
FUEL ECONOMY PRE-TEST INSPECTION FORM
Page 1 of 1
Bus Number:
Date:
Personnel:
PRE WARM-UP
If OK, Initial
Fuel Economy Pre-Test Maintenance Form is complete
Cold tire pressure (psi): Front ? Middle N/A Rear ?
Tire wear:
Engine oil level
Engine coolant level
Interior and exterior lights on, evaporator fan on
Fuel economy instrumentation installed and working properly.
Fuel line -- no leaks or kinks
Speed measuring system installed on bus. Speed indicator
installed in front of bus and accessible to TECH and Driver.
Bus is loaded to SLW
WARM-UP
If OK, Initial
Bus driven for at least one hour warm-up
No extensive or black smoke from exhaust
POST WARM-UP
Warm tire pressure (psi): Front ? Middle N/A Rear ?
Environmental conditions
Average wind speed <12 mph and maximum gusts <15 mph
Ambient temperature between 30°(-1°) and 90°F(32°C)
Track surface is dry
Track is free of extraneous material and clear of
interfering traffic
Page 92 of 112
If OK, Initial
FUEL ECONOMY DATA FORM (Gaseous Fuels)
Page 1 of 4
Bus Number:
Manufacturer:
Date:
Run Number: 1
Personnel:
Test Direction: □CW or □CCW
Ambient Temperature (°F):
Humidity (%):
SLW (lbs):
Wind Speed (mph) & Direction:
Barometric Pressure (in.Hg):
Run Time (min:sec)
Cycle Type
Cycle Time
(min:sec)
Start
Finish
Fuel
Temperature
(°F)
Total Fuel
Used (SCF)
Start
CBD #1
ART #1
CBD #2
ART #2
CBD #3
COMMUTER
Total Fuel: ???.? SCF
20 minute idle : Total Fuel Used = SCF
No Load Flow Rate at Idle = SCFM
Heating Value =
BTU/LB
Comments:
Page 93 of 112
No Load Flow Rate at Full Throttle =
SCFM
FUEL ECONOMY DATA FORM (Gaseous Fuels)
Page 2 of 4
Bus Number:
Manufacturer:
Date:
Run Number: 2
Personnel:
Test Direction: □CW or □CCW
Ambient Temperature (°F):
Humidity (%):
SLW (lbs):
Wind Speed (mph) & Direction:
Barometric Pressure (in.Hg):
Run Time (min:sec)
Cycle Type
Cycle Time
(min:sec)
Start
Finish
Fuel
Temperature
(°F)
Total Fuel
Used (SCF)
Start
CBD #1
ART #1
CBD #2
ART #2
CBD #3
COMMUTER
Total Fuel: ???.? SCF
20 minute idle : Total Fuel Used = SCF
No Load Flow Rate at Idle = SCFM
Heating Value =
BTU/LB
Remarks/comments/recommended changes:
Page 94 of 112
No Load Flow Rate at Full Throttle =
SCFM
FUEL ECONOMY DATA FORM (Gaseous Fuels)
Page 3 of 4
Bus Number:
Manufacturer:
Date:
Run Number: 3
Personnel:
Test Direction: □CW or □CCW
Ambient Temperature (°F):
Humidity (%):
SLW (lbs):
Wind Speed (mph) & Direction:
Barometric Pressure (in.Hg):
Run Time (min:sec)
Cycle Type
Cycle Time
(min:sec)
Start
Finish
Fuel
Temperature
(°F)
Total Fuel
Used (SCF)
Start
CBD #1
ART #1
CBD #2
ART #2
CBD #3
COMMUTER
Total Fuel: ???.? SCF
20 minute idle : Total Fuel Used = SCF
No Load Flow Rate at Idle = SCFM
Heating Value =
No Load Flow Rate at Full Throttle =
BTU/LB
Remarks/comments/recommended changes:
FUEL ECONOMY DATA FORM (Gaseous Fuels)
Page 95 of 112
SCFM
Page 4 of 4
Bus Number:
Manufacturer:
Date:
Run Number: 4
Personnel:
Test Direction: □CW or □CCW
Ambient Temperature (°F):
Humidity (%):
SLW (lbs):
Wind Speed (mph) & Direction:
Barometric Pressure (in.Hg):
Run Time (min:sec)
Cycle Type
Cycle Time
(min:sec)
Start
Finish
Fuel
Temperature
(°F)
Total Fuel
Used (SCF)
Start
CBD #1
ART #1
CBD #2
ART #2
CBD #3
COMMUTER
Total Fuel: ???.? SCF
20 minute idle : Total Fuel Used = SCF
No Load Flow Rate at Idle = SCFM
Heating Value =
BTU/LB
Remarks/comments/recommended changes:
Page 96 of 112
No Load Flow Rate at Full Throttle =
SCFM
Fuel Economy Summary Sheet
Page 97 of 112
7. NOISE
7.1 INTERIOR NOISE AND VIBRATION TESTS
7.1-I. TEST OBJECTIVE
The objective of these tests is to measure and record interior noise levels and
check for audible vibration under various operating conditions.
7.1-II. TEST DESCRIPTION
During this series of tests, the interior noise level will be measured at several
locations with the bus operating under the following three conditions:
1. With the bus stationary, a white noise generating system shall provide a uniform
sound pressure level equal to 80 dB(A) on the left, exterior side of the bus. The
engine and all accessories will be switched off and all openings including doors
and windows will be closed. This test will be performed at the ABTC.
2. The bus accelerating at full throttle from a standing start to 35 mph on a level
pavement. All openings will be closed and all accessories will be operating
during the test. This test will be performed on the track at the Test Track Facility.
3. The bus will be operated at various speeds from 0 to 55 mph with and without the
air conditioning and accessories on. Any audible vibration or rattles will be
noted. This test will be performed on the test segment between the Test Track
and the Bus Testing Center.
All tests will be performed in an area free from extraneous sound-making sources
or reflecting surfaces. The ambient sound level as well as the surrounding weather
conditions will be recorded in the test data.
7.1-III. DISCUSSION
This test is performed in three parts. The first part exposes the exterior of the
vehicle to 80.0 dB(A) on the left side of the bus and the noise transmitted to the interior
is measured. The overall average of the six measurements was ??.? dB(A); ranging
from ??.? dB(A) at the driver=s seat to ??.? dB(A) in line with the middle speaker. The
interior ambient noise level for this test was ??.? dB(A).
The second test measures interior noise during acceleration from 0 to 35 mph.
This noise level ranged from ??.? dB(A) at the driver=s seat to ??.? dB(A) at the rear
passenger seats. The overall average was ??.? dB(A). The interior ambient noise level
for this test was ??.? dB(A).
The third part of the test is to listen for resonant vibrations, rattles, and other noise
sources while operating over the road. No vibrations or rattles were noted.
Page 98 of 112
INTERIOR NOISE TEST DATA FORM
Test Condition 1: 80 dB(A) Stationary White Noise
Page 1 of 3
Bus Number:
Date:
Personnel:
Temperature (°F):
Humidity (%):
Wind Speed (mph):
Wind Direction:
Barometric Pressure (in.Hg):
Initial Sound Level Meter Calibration: ■ checked by:
Interior Ambient
Noise Level dB(A):
Exterior Ambient
Noise Level dB(A):
Microphone Height During Testing (in):
Measurement Location
Measured Sound Level dB(A)
Driver's Seat
Front Passenger Seats
In Line with Front Speaker
In Line with Middle Speaker
In Line with Rear Speaker
Rear Passenger Seats
Final Sound Level Meter Calibration: ■ checked by:
Comments: All readings taken in the center aisle.
Remarks/comments/recommended changes:
Note: Actual sound level is corrected for ambient inside sound level.
Page 99 of 112
INTERIOR NOISE TEST DATA FORM
Test Condition 2: 0 to 35 mph Acceleration Test
Page 2 of 3
Bus Number:
Date:
Personnel:
Temperature (°F):
Humidity (%):
Wind Speed (mph):
Wind Direction:
Barometric Pressure (in.Hg):
Initial Sound Level Meter Calibration: ■ checked by:
Interior Ambient
Noise Level dB(A):
Exterior Ambient
Noise Level dB(A):
Microphone Height During Testing (in):
Measurement Location
Measured Sound Level dB(A)
Driver’s Seat
Front Passenger Seats
Middle Passenger Seats
Rear Passenger Seats
Final Sound Level Meter Calibration: ■ checked by:
Comments: All readings taken in the center aisle.
Remarks/comments/recommended changes:
Note: Actual sound level is corrected for ambient inside sound level.
Page 100 of 112
INTERIOR NOISE TEST DATA FORM
Test Condition 3: Audible Vibration Test
Page 3 of 3
Bus Number:
Date:
Personnel:
Temperature (°F):
Humidity (%):
Wind Speed (mph):
Wind Direction:
Barometric Pressure (in.Hg):
Describe the following possible sources of noise and give the relative location on the
bus.
Source of Noise
Location
Engine and Accessories
Windows and Doors
Seats and Wheel Chair lifts
Comment on any other vibration or noise source which may have occurred
that is not described above:
Remarks/comments/recommended changes:
Note: Actual sound level is corrected for ambient inside sound level.
Page 101 of 112
7.1 INTERIOR NOISE TEST
TEST BUS SET-UP FOR 80 dB(A)
INTERIOR NOISE TEST
Page 102 of 112
7.2 EXTERIOR NOISE TESTS
7.2-I. TEST OBJECTIVE
The objective of this test is to record exterior noise levels when a bus is operated
under various conditions.
7.2-II. TEST DESCRIPTION
In the exterior noise tests, the bus will be operated at a SLW in three different
conditions using a smooth, straight and level roadway:
1.
2.
3.
Accelerating at full throttle from a constant speed at or below 35 mph and just
prior to transmission upshift.
Accelerating at full throttle from standstill.
Stationary, with the engine at low idle, high idle, and wide open throttle.
In addition, the buses will be tested with and without the air conditioning and all
accessories operating. The exterior noise levels will be recorded.
The test site is at the PSBRTF and the test procedures will be in accordance with
SAE Standards SAE J366b, Exterior Sound Level for Heavy Trucks and Buses. The test
site is an open space free of large reflecting surfaces. A noise meter placed at a
specified location outside the bus will measure the noise level.
During the test, special attention should be paid to:
1.
2.
3.
The test site characteristics regarding parked vehicles, signboards, buildings,
or other sound-reflecting surfaces
Proper usage of all test equipment including set-up and calibration
The ambient sound level
7.2-III. DISCUSSION
The Exterior Noise Test determines the noise level generated by the vehicle under
different driving conditions and at stationary low and high idle, with and without air
conditioning and accessories operating. The test site is a large, level, bituminous paved
area with no reflecting surfaces nearby.
With an outside ambient noise level of ??.? dB(A), the average test result obtained
while accelerating from a constant speed was ??.? dB(A) on the right side and ??.?
dB(A) on the left side.
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When accelerating from a standstill with an exterior ambient noise level of ??.?
dB(A), the average of the results obtained were ??.? dB(A) on the right side and ??.?
dB(A) on the left side.
With the vehicle stationary and the engine, accessories, and air conditioning on,
the measurements averaged ??.? dB(A) at low idle, ??.? dB(A) at high idle, and ??.?
dB(A) at wide open throttle. With the accessories and air conditioning off, the readings
averaged ??.? dB(A) lower at low idle, ??.? dB(A) lower at high idle, and ??.? dB(A)
lower at wide open throttle. The exterior ambient noise level measured during this test
was ??.? dB(A).
Page 104 of 112
EXTERIOR NOISE TEST DATA FORM
Accelerating from Constant Speed
Page 1 of 3
Bus Number:
Date:
Personnel:
Temperature (°F):
Humidity (%):
Wind Speed (mph):
Wind Direction:
Barometric Pressure (in.Hg):
Verify that microphone height is 4 feet, wind speed is less than 12 mph and ambient
temperature is between 30°F and 90°F: ■ checked by:
Initial Sound Level Meter Calibration: ■ checked by:
Exterior Ambient Noise Level dB(A):
Accelerating from Constant Speed
Curb (Right) Side
Run #
Accelerating from Constant Speed
Street (Left) Side
Measured Noise
Level dB(A)
Run #
1
1
2
2
3
3
4
4
5
5
Average of two highest actual
noise levels = dB(A)
Measured Noise Level
dB(A)
Average of two highest actual
noise levels = dB(A)
Final Sound Level Meter Calibration Check: ■ checked by:
Remarks/comments/recommended changes:
Page 105 of 112
EXTERIOR NOISE TEST DATA FORM
Accelerating from Standstill
Page 2 of 3
Bus Number:
Date:
Personnel:
Temperature (°F):
Humidity (%):
Wind Speed (mph):
Wind Direction:
Barometric Pressure (in.Hg):
Verify that microphone height is 4 feet, wind speed is less than 12 mph and ambient
temperature is between 30°F and 90°F: ■ checked by:
Initial Sound Level Meter Calibration: ■ checked by:
Exterior Ambient Noise Level dB(A):
Accelerating from Standstill
Curb (Right) Side
Run #
Accelerating from Standstill
Street (Left) Side
Measured Noise
Level dB(A)
Run #
1
1
2
2
3
3
4
4
5
5
Average of two highest actual noise
levels =
dB(A)
Measured
Noise Level
dB(A)
Average of two highest actual noise
levels =
dB(A)
Final Sound Level Meter Calibration Check: ■ checked by:
Remarks/comments/recommended changes:
Page 106 of 112
EXTERIOR NOISE TEST DATA FORM
Stationary
Page 3 of 3
Bus Number:
Date:
Personnel:
Temperature (°F):
Humidity (%):
Wind Speed (mph):
Wind Direction:
Barometric Pressure (in.Hg):
Verify that microphone height is 4 feet, wind speed is less than 12 mph and ambient
temperature is between 30°F and 90°F: ■ checked by:
Initial Sound Level Meter Calibration: ■ checked by:
Exterior Ambient Noise Level dB(A):
Accessories and Air Conditioning ON
Throttle Position
Engine RPM
Curb (Right) Side
dB(A)
Street (Left) Side
db(A)
Measured
Measured
Low Idle
High Idle
Wide Open Throttle
Accessories and Air Conditioning OFF
Throttle Position
Engine RPM
Curb (Right) Side
dB(A)
Street (Left) Side
db(A)
Measured
Measured
Low Idle
High Idle
Wide Open Throttle
Final Sound Level Meter Calibration Check: ■ checked by:
Remarks/comments/recommended changes:
Page 107 of 112
8. EMISSIONS TEST – DYNAMOMETER-BASED
EMISSIONS TEST USING TRANSIT DRIVING CYCLES
8-I. TEST OBJECTIVE
The objective of this test is to provide comparable emissions data on transit
buses produced by different manufacturers. This chassis-based emissions test
bears no relation to engine certification testing performed for compliance with the
Environmental Protection Agency (EPA) regulation. EPA's certification tests are
performed using an engine dynamometer operating under the Federal Test
Protocol. This emissions test is a measurement of the gaseous engine emissions
CO, CO2, NOx, HC and particulates (diesel vehicles) produced by a vehicle
operating on a large-roll chassis dynamometer. The test is performed for three
differed driving cycles intended to simulate a range of transit operating
environments. The cycles consist of Manhattan Cycle, the Orange County Bus
driving cycle, and the Urban Dynamometer Driving Cycle (UDDS). The test is
performed under laboratory conditions in compliance with EPA 1065 and SAE
J2711. The results of this test may not represent actual in-service vehicle
emissions but will provide data that can be used by recipients to compare buses
tested under different operating conditions.
8-II. TEST DESCRIPTION
This test is performed in the emissions bay of the LTI Vehicle Testing
Laboratory. The Laboratory is equipped with a Schenk Pegasus 300 HP, largeroll (72 inch diameter) chassis dynamometer suitable for heavy-vehicle emissions
testing. The dynamometer is located in the end test bay and is adjacent to the
control room and emissions analysis area. The emissions laboratory provides
capability for testing heavy-duty diesel and alternative-fueled buses for a variety
of tailpipe emissions including particulate matter, oxides of nitrogen, carbon
monoxide, carbon dioxide, and hydrocarbons. It is equipped with a Horiba fullscale CVS dilution tunnel and emissions sampling system. The system includes
Horiba Mexa 7400 Series gas analyzers and a Horiba HF47 Particulate Sampling
System. Test operation is automated using Horiba CDTCS software. The
computer controlled dynamometer is capable of simulating over-the-road
operation for a variety of vehicles and driving cycles.
The emissions test will be performed as soon as permissible after the
completion of the GVW portion of the structural durability test. The driving cycles
are the Manhattan cycle, a low average speed, highly transient urban cycle
(Figure 1), the Orange County Bus Cycle which consists of urban and highway
driving segments (Figure 2), and the EPA UDDS Cycle (Figure 3). An emissions
test will comprise of two runs for the three different driving cycles, and the
Page 108 of 112
average value will be reported. Test results reported will include the average
grams per mile value for each of the gaseous emissions for gasoline buses, for
all the three driving cycles. In addition, the particulate matter emissions are
included for diesel buses, and non-methane hydrocarbon emissions (NMHC) are
included for CNG buses. Testing is performed in accordance with EPA CFR49,
Part 1065 and SAE J2711 as practically determined by the FTA Emissions
Testing Protocol developed by West Virginia University and Penn State
University.
Figure 1. Manhattan Driving Cycle (duration 1089 sec, Maximum speed
25.4mph, average speed 6.8mph)
Figure 2. Orange County Bus Cycle (Duration 1909 Sec, Maximum Speed
41mph, Average Speed 12mph)
Page 109 of 112
Figure 3. HD-UDDS Cycle (duration 1060seconds, Maximum Speed 58mph,
Average Speed 18.86mph)
8-III. TEST ARTICLE
The test article is a XXXX model transit bus equipped with XXXX(fuel type)
fueled XXXX (engine mfgr and model). The bus was tested on (date) with the
odometer reading XXXX miles.
8-IV. TEST EQUIPMENT
Testing is performed in the LTI Vehicle Testing Laboratory emissions
testing bay. The test bay is equipped with a Schenk Pegasus 72-inch, large-roll
chassis dynamometer. The dynamometer is electronically controlled to account
for vehicle road-load characteristics and for simulating the inertia characteristics
of the vehicle. Power to the roller is supplied and absorbed through an
electronically controlled 3-phase ac motor. Absorbed power is dumped back
onto the electrical grid.
Vehicle exhaust is collected by a Horiba CVS, full-flow dilution tunnel. The
system has separate tunnels for diesel and gasoline/natural gas fueled vehicles.
In the case of diesel vehicles, particulate emissions are measured gravimetrically
using 47mm Teflon filters. These filters are housed in a Horiba HF47 particulate
sampler, per EPA 1065 test procedures.. Heated gaseous emissions of
hydrocarbons and NOx are sampled by Horiba heated oven analyzers. Gaseous
Page 110 of 112
emissions for CO, CO2 and cold NOx are measured using a Horiba Mexa 7400
series gas analyzer. System operation, including the operation of the chassis
dynamometer, and all calculations are controlled by a Dell workstation running
Horiba CDCTS test control software. Particulate Filters are weighed in a glove
box using a Sartorius microbalance accurate to 1 microgram.
8-V. TEST PREPARATION AND PROCEDURES
All vehicles are prepared for emissions testing in accordance with the Fuel
Economy Pre-Test Maintenance Form. (In the event that fuel economy test was
performed immediately prior to emissions testing this step does not have to be
repeated) This is done to ensure that the bus is tested in optimum operating
condition. The manufacturer-specified preventive maintenance shall be
performed before this test. The ABS system and when applicable, the
regenerative braking system are disabled for operation on the chassis
dynamometer. Any manufacturer-recommended changes to the pre-test
maintenance procedure must be noted on the revision sheet. The Fuel Economy
Pre-Test Inspection Form will also be completed before performing. Both the
Fuel Economy Pre-Test Maintenance Form and the Fuel Economy Pre-Test
Inspection Form are found on the following pages.
Prior to performing the emissions test, each bus is evaluated to determine
its road-load characteristics using coast-down techniques in accordance with
SAE J1263. This data is used to program the chassis dynamometer to
accurately simulate over-the-road operation of the bus.
Warm-up consists of driving the bus for 20 minutes at approximately 40
mph on the chassis dynamometer. The test driver follows the prescribed driving
cycle watching the speed trace and instructions on the Horiba Drivers-Aid
monitor which is placed in front of the windshield. The CDCTS computer
monitors driver performance and reports any errors that could potentially
invalidate the test.
All buses are tested at half seated load weight. The base line emissions
data are obtained at the following conditions:
1.
2.
3.
4.
5.
6.
7.
8.
Air conditioning off
Evaporator fan or ventilation fan on
One Half Seated load weight
Appropriate test fuel with energy content (BTU/LB) noted in CDTCS
software
Exterior and interior lights on
Heater Pump Motor off
Defroster off
Windows and Doors closed
Page 111 of 112
The test tanks or the bus fuel tank(s) will be filled prior to the fuel economy
test with the appropriate grade of test fuel.
8-VI DISCUSSION
The following Table 1 provides the emissions testing results on a grams per
mile basis for each of the exhaust constituents measured and for each driving
cycle performed.
TABLE 1 Emissions Test Results
Test Completed at Half SLW: _________
Driving Cycle
Manhattan
Orange County
Bus
CO2, gm/mi
CO, gm/mi
THC, gm/mi
NMHC, gm/mi
NOx, gm/mi
Particulates.
gm/mi
Fuel
consumption
mpg
Page 112 of 112
UDDS
| File Type | application/pdf |
| File Title | reportblank.gas.sharepoint |
| Author | Sondra Hoover |
| File Modified | 2014-09-24 |
| File Created | 2014-09-24 |