Standard Bus Procurement Guidelines - APTAStandards.com

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Standard Bus Procurement Guidelines (11) Heavy Heavy-Duty Diesel Engine (HHDD). Heavy heavy-duty diesel engines have sleeved cylinder liners, are designed for multiple rebuilds, and a rated horsepower that generally exceeds 250. (12) Operator's Eye Range. The 95th-percentile ellipse defined in SAE Recommended Practice J941, except that the height of the ellipse shall be determined from the seat at its reference height. (13) Fireproof. Materials that will not burn or melt at temperatures less than 2,000Ε F. (14) Fire-Resistant. Materials that have a flame spread index less than 150 as measured in a radiant panel flame test per ASTM-E 162-75. (15) Human Dimensions. The human dimensions used in Part 5: Technical Specifications are defined in SAE Recommended Practice J833. (16) HIC (Head Injury Criteria). The following equation presents the definition of head injury criteria: where: ⎡ ⎣ ⎢ t 1 − t 1 2 ∫ t t 2 1 ⎤ ⎦ ⎥ 2 . 5 ( a ) d t ( t 2 − t 1) a = the resultant acceleration at the center of gravity of the head form expressed as a multiple of g, the acceleration of gravity. t1 and t2 = any two points in time during the impact. (17) Baseline Configuration Bus. The bus described by Part 5: Technical Specifications if no alternatives are selected. Signing, colors, the destination sign reading list and other information must be provided by the Procuring Agency in attachments to Part 5: Technical Specifications. (18) Alternative. An alternative specification condition to the standard configuration bus. The Procuring Agency may define alternatives to the standard configuration to satisfy local operating requirements. Alternatives for the standard configuration will be clearly identified. (19) Design Operating Profile. The operating profile for design purposes shall consist of simulated transit type service. The duty cycle is described in the figure “Transit Coach Duty Technical Specifications 120 10/18/07
Standard Bus Procurement Guidelines Cycle.” The duty cycle consists of three phases to be repeated in sequence: a central business district (CBD) phase of 2 miles with 7 stops per mile and a top speed of 20 mph, an arterial route 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 55 mph and an idle phase. Transit Coach Duty Cycle The bus shall be loaded to SLW and shall average approximately 18 mph while operating on this duty cycle. Operation shall continue regardless of the ambient temperature or weather conditions. The passenger doors shall be opened and closed at each stop, and the bus shall be knelt at each stop during the CBD phase. The braking profile shall be: 16 percent of the stops at 3 ft/sec/sec 50 percent of the stops at 6 ft/sec/sec 26 percent of the stops at 9 ft/sec/sec 8 percent of the stops at 12 ft/sec/sec These percentages of stops shall be evenly distributed over the three phases of the duty cycle. For scheduling purposes, the average deceleration rate is assumed. (20) Class of Failures. Classes of failures are described below. Technical Specifications 121 10/18/07
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American Public Transit Association
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