00367866

Monograph

http://onlinepubs.trb.org/Onlinepubs/nctrp/rpt1/1.pdf

In the specification of a bus, transit properties are concerned with both cost and performance considerations. One of the major cost components is fuel, and the tradeoffs between fuel savings and performance are often difficult to determine. The objective of this research was to develop a handbook suitable for use by transit property managers in specifying a new bus, giving appropriate attention to the energy efficiency and productivity of different bus types, equipment, and options. Bus equipment and options that were considered in this research included power train features (e.g., transmission shift schedule and converters, axle gear ratios, engine size and power rating); standard component options (e.g., type of heating/air conditioning systems, tire size and type); and basic design and safety features (e.g. overall weight, seating plan, weight of wheelchair lifts and safety bumpers). Estimates of the relative energy consumption levels of the various itmes of equipment and options were developed. A baseline equipment configuration was specified for each bus type and size, and the energy-consumption characteristics of each option were related to this baseline. An approach was developed for estimating energy-efficiency characteristics of standard and articulated buses over the full range of operating environments (e.g., terrain, maximum operating speed, number of stops per mile). Information provided in the handbook (included in the Appendix to this report) was developed through computer simulation using a model that had been developed previously Booz, Allen & Hamilton, Inc. Simulations were run on three different types of bus routes, using sample data on bus characteristics collected from several manufacturers, to compare energy efficiency vs. performance under various operating conditions. The results of the simulation runs are provided in the handbook to illustrate the tradeoffs that need to be considered in selecting a bus. Those involved in the selection and specification of buses for transit properties will find this report of special interest. Bus manufacturers can also use the research results to develop information that will be applicable to the specific needs of a property. The handbook is designed as a guide for the comparison of bus equipment and components with primary emphasis on fuel consumption and performance considerations.

Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

55 p.

1982-7

NCTRP Report

Digital/other

Appendices (1) ; Figures; Tables

Axles; Buses; Diesel engines; Fuel consumption; Performance evaluations; Power trains; Simulation; Specifications; Torque converters; Transmissions; Vehicle design

Duty cycles

Design; Energy; Highways; Public Transportation; Society; Vehicles and Equipment; I91: Vehicle Design and Safety

TRIS, TRB

Oct 30 1982 12:00AM