Wheelset Mechanics During Wheelclimb Derailment

[+] Author and Article Information
A. Karmel

Mechanical Research Department, General Motors Research Laboratories, Warren, Mich. 48090

L. M. Sweet

Control Theory and Systems Program, General Electric Co., Corporate Research and Development, Schenectady, N.Y. 12345

J. Appl. Mech 51(3), 680-686 (Sep 01, 1984) (7 pages) doi:10.1115/1.3167692 History: Received January 01, 1982; Revised February 01, 1984; Online July 21, 2009


An analysis of the mechanics and dynamics of a railroad vehicle wheelset during flange contact and wheelclimb derailment is presented. The theoretical model includes wheelset lateral, vertical, roll, yaw, and axle rotation degrees of freedom, plus lateral displacement of the truck frame. The equations of motion are based on the kinematics and dynamics of the wheelset subject to constraints imposed by wheel/rail contact geometry. These constraints are used to compute creepages and normal forces at the wheel/rail contact points, needed as inputs to the Kalker Simplified Theory of rolling contact. Computational methods for simulation of the nonlinear dynamic model are discussed. Results of the simulation demonstrate the significance of the various degrees of freedom on wheelset motion and on predicted values of the derailment quotient (Q/P).

Copyright © 1984 by ASME
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