Specifications

REQUEST FOR PROPOSALS FOR
PURCHASE AND DELIVERY OF HEAVY-DUTY BUSES
RFP SRTA-2014-01
TECHNICAL SPECIFICATIONS
PAGE-5
December 2013
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terminating test speed is sixty-five (65) miles per hour. Observe and
record maximum sound level during this operating mode. The sound
level recorded shall be the average of at least four (4) readings.
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e. Measurements shall be taken where there are no reflecting or absorbing
surfaces to change the sounds emitting from the vehicle.
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4.4 External Noise
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Airborne noise generated by the coach and measured from either side shall not
exceed 83 DBA under full power acceleration when operated at or below 35 mph
at curb weight and just prior to transmission upshift. The maximum noise level
generated by the coach pulling away from a stop at full power shall not exceed
83 DBA. The coach generated noise at curb idle shall not exceed 65 DBA. If the
noise contains an audible discrete frequency, a penalty of 5 DBA shall be added
to the sound level measured. All noise readings shall be taken 50 feet from the
perpendicular to the centerline of the coach with all accessories operating.
Instrumentation, test sites, and other general requirements shall be in
accordance with SAE Standard J366. The pull-away test shall begin with the
front bumper even with the microphone. The curb idle test shall be conducted
with the rear bumper even with the microphone.
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5. CRASHWORTHINESS
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a. The coach body and roof structure shall withstand a static load equal to 150 percent of
the curb weight evenly distributed on the roof with no more than a 6 inch reduction in any
interior dimension. Windows shall remain in place and shall not open under such a load.
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b. The coach shall withstand a 25 mph impact by a 4,000 pound post-1973 American
automobile at any point, excluding doorways, along either side of the coach with no more
than 3 inches of permanent structural deformation at seated passenger hip height. This
impact shall not result in sharp edges or protrusions in the coach interior.
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c. Exterior panels and their supporting members shall withstand a static load of 2,000
pounds applied perpendicular to the coach anywhere by a pad no larger than 5 inches
square. This load shall not result in deformation that prevents installation of new exterior
panels to restore the original appearance of the coach.
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d. The coach, at GVWR and under static conditions, shall not exhibit deformation or
deflection that impairs operation of doors, windows, or other mechanical elements. Static
conditions include the vehicle at rest with any one wheel or dual set of wheels on a 6 inch
curb or in a 6 inch deep hole.
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e. All structure, body, and panel-bending mode frequencies, including vertical, lateral, and
torsional modes, shall be sufficiently removed from all primary excitation frequencies to
minimize audible, visible, or sensible resonant vibrations during normal service.
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f. To protect passengers seated in low floor area, the basic low floor coach structure shall
incorporate a substantial side impact barrier. The barrier shall include steel plate,
continuous between the front wheel arches and the rear suspension (except in the width
of the exit door opening). The impact barrier shall be an integral welded part of the
undercarriage portion of the coach structure, and shall be angled such that vehicles
impacting the coach side will tend to subvert. To further increase both passenger safety