Technical Reports

Rail Garrison - Vehicle Stationary Vibration Tests

  • 22
  • Mar
  • 1988
AUTHOR: J. A. Hadden, D. R. Ahlbeck, M. Kurre, J. M. Tuten
SUBJECT: Evaluation
KEYWORDS: Railcar Accelerations, Seismic Vibrations, Vibration Enivironment, TTC
ABSTRACT: The United States Air Force (USAF/BMO) requested support from the Federal Railroad Administration (FRA) to assist in technical issues related to the development of the Peacekeeper Rail Garrison Program. During operation of the Rail Garrison train, the consist will stop at various locations to calibrate the missile guidance system. Ground vibrations from the idling locomotive or from trains passing on an adjacent track pose a potential for interference with this operational process. It is critical therefore to characterize the operating and environmental vibration levels, so that conditions which might jeopardize the successful calibration of the missile guidance system are identified. A series of tests were conducted at the Transportation Test Center (TTC) near Pueblo, Colorado to establish environmental vibration levels. These tests utilized a heavily-loaded 8-axle flat car to simulate the missile launch car, plus combinations of other loaded cars to approximate the weight and geometry of other Rail Garrison cars. Background vibration levels were established at the test site both with and without the a.c. power generator in operation. A variety of test conditions was run, including the locomotive coupled and uncoupled (at different separation distances), two-cycle and four-cycle locomotive engines, different engine idling speeds, and different positions in the consist of the test car. Orthogonal accelerations were measured on the test car over front and rear truck-pair center- plates, and at the track beneath the test car leading axle or beneath the locomotive trailing axle. Train pass-by vibration levels were also recorded.