Technical Reports

Massachusetts Bay Transportation Authority No. 12 Orange Line Vehicle Evaluation

  • 01
  • Oct
  • 1981
AUTHOR: K. J. Simmonds, G. R. Arnold
SUBJECT: High-Speed Passenger Rail, Evaluation
KEYWORDS: Rapid Transit Vehicles, Performance, Ride Quality, Interior Noise, Brake Squeal
ABSTRACT: This report presents the results of an engineering evaluation of the Massachusetts Bay Transportation Authority's No. 12 Orange Line rapid transit cars, accomplished at the Transportation Test Center, Pueblo, Colorado. The test program was carried out from February through April, 1981. The scope of the program included vehicle performance, ride quality, acoustic transmissibility and absorptivity tests, and an evaluation of the squeal properties of several brake shoe types. Wherever appropriate, test data were compared to the vehicle specifications criteria; ride quality data were compared to International Organization for Standardization (ISO) guidelines for ride comfort. The test data show that the vehicles generally met the requirements of their specification criteria; deficiencies were noted in the friction-only and emergency braking performance. The vehicle ride quality was dominated by a vertical vibration at the carbody center, thought to be due to excitation of the first vertical bending mode. The phenomenon was aggravated by passenger load and by speed. At higher passenger loads and speeds the vertical vibration approached the 25-minute reduced comfort boundary of the ISO guidelines. The contribution of the vehicle doors to the transmissibility of noise to the vehicle interior was defined, together with the effectiveness of acoustic ceiling panels in attenuating interior noise. The brake squeal tests identified a type of lead- and asbestos- free shoe which did not squeal, but which exhibited a braking performance decrement compared to the standard brake shoes.
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