Technical Reports

Transit Car Demonstration Test Program On the Roll Dynamics Unit Volume I

  • 18
  • Mar
  • 1981
AUTHOR: N.K. Cooperrider, E.H. Law, R.H. Fries, I. Haque, G. Arnold, S. Nelson
SUBJECT: Evaluation
KEYWORDS: Analytical Modeling, Creep Forces, Energy Consumption, Rail Dynamics, Spin/Slide, Traction Resistance
ABSTRACT: This report documents two separate studies aimed at verifying and demonstrating the capabilities of the Roll Dynamics Unit (RDU). The RDU is part of the Rail Dynamics Laboratory (RDL), located at the Transportation Test Center (TTC). in Pueblo, Colorado. During testing, the RDU's potential for simulating actual track conditions was explored and results were correlated with measurements taken during in-track testing. Other efforts focused on the RDU's use as a laboratory instrument, by which selected performance parameters can be varied, and the responses of a single rail vehicle measured, under controlled conditions. Sponsored by the Urban Mass Transportation Administration (UMTA), testing involved use of the Number One SOAC (State-of-the-Art Car), one of two such vehicles developed under UMTA's Urban Rail Vehicle and Systems Program (URRVS). The 90,00(}-pound intra-city, rapid transit vehicle, configured as an "A" Car (capable of independent or two-car operation), was operated on the TTC's Transit Test Track (TTT) to provide in-track data. It was then installed on the RDU for the testing described in this report. Information on SOAC technical/historical development and URRVS Program highlights are presented as background for the discussion of the results. The first study was conducted by TTC personnel under the technical counsel of University of Arizona and Clemson University personnel and concerned itself with rail vehicle stability. Test methodology and software requirements were developed and analytical models evaluated. RDU mechanical characteristics were assessed in terms of their influence on measured vehicle responses during studies of hunting, creep forces, and forced sinusoidal responses.