A nonlinear comprehensive model has been developed in this paper to study the train derailment and hunting in severe braking conditions. The train consists of cars each having 40 dof, connected to each other by couplers and buffers. The car model is nonlinear and three-dimensional and includes nonlinear springs and dampers of primary and secondary suspensions, dry friction between different parts such as car body and side bearers, center-plate parts, wheelset bearings and bogie frames, and also clearances and mechanical stops. Nonlinearities of wheel and rail profiles, pressure build-up delay in brake circuit, and nonlinearities of connecting parts have also been included in the model. A complete set of equations has been derived for the train. The equations are solved numerically for different car weight configurations when severe brake is applied. Derailment coefficient is determined for several train make-ups and tendency of the wheels towards derailment is investigated. Optimum configuration of cars in a light-heavy set, and critical derailment velocity can be determined to minimize the tendency of train derailment. The results are in excellent agreement with the field experience.
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March 2003
Technical Papers
Nonlinear Analysis of Train Derailment in Severe Braking
Mohammad Durali,
e-mail: durali@sharif.edu
Mohammad Durali
Mechanical Engineering Department, Sharif University of Technology, Box 11365-9567, Tehran, Iran
Search for other works by this author on:
Baabak Shadmehri
Baabak Shadmehri
Mechanical Engineering Department, Sharif University of Technology, Box 11365-9567, Tehran, Iran
Search for other works by this author on:
Mohammad Durali
Mechanical Engineering Department, Sharif University of Technology, Box 11365-9567, Tehran, Iran
e-mail: durali@sharif.edu
Baabak Shadmehri
Mechanical Engineering Department, Sharif University of Technology, Box 11365-9567, Tehran, Iran
Contributed by the Dynamic Systems and Control Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received by the ASME Dynamic Systems and Control Division, May 2001; final revision, August 2002. Associate Editor: S. Sivashankar.
J. Dyn. Sys., Meas., Control. Mar 2003, 125(1): 48-53 (6 pages)
Published Online: March 10, 2003
Article history
Received:
May 1, 2001
Revised:
August 1, 2002
Online:
March 10, 2003
Citation
Durali, M., and Shadmehri, B. (March 10, 2003). "Nonlinear Analysis of Train Derailment in Severe Braking ." ASME. J. Dyn. Sys., Meas., Control. March 2003; 125(1): 48–53. https://doi.org/10.1115/1.1541669
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