Technical Reports

Safety of Railroad Passenger Vehicle Dynamics: OMNISIM Simulation and Test Correlations of Passenger Rail Cars

  • 01
  • Jul
  • 2002
AUTHOR: Federal Railroad Administration; Gopal Samavedam; John Gomes
SUBJECT: Track, Tracks & Structures, Track/Train Interactions
KEYWORDS: Passenger rail vehicles, OMNISIM
ABSTRACT: The purpose of the work is to validate the safety assessment methodology previously developed for passenger rail vehicle dynamics, which requires the application of simulation tools as well as testing of vehicles under different track scenarios. This report specifically addresses the evaluation of the tasks in the methodology related to measurement of vehicle and track parameters, test conduct, and correlation of the test results with computer simulation results. This report presents a summary of the testing and correlation with OMNISIM computer simulation results for two different rail passenger rail car designs. The first design had non-equalized trucks and the second had equalized trucks. The tests and OMNISIM simulation correlations included vehicle response to variations in vertical alignment, steady curving, dynamic curving, yaw and sway, twist and roll, pitch and bounce, and hunting with initial alignment defects. For each dynamic test, a description and correlation re provided. Summary tables are provided for the measured and simulated maximum and RMS force levels of each test. It is concluded that the methodology can be used to adequately evaluate the safety issues involved in the dynamic behavior of the passenger rail vehicles as they negotiate a variety of track conditions.