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Users' Manual for Asymmetric Wheel/Rail Contact Characterization Program

Report Number: FRA/ORD-78/05
Author(s): Hell, R. and N. K. Cooperrider
Corporate Author: Clemson University and Arizona State University
Date of Publication: 1977-12
Pages: 103
Contract: DOT-OS-40018
PB Number: PB279707

Abstract:
Wheel/rail geometric constraint relationships, such as the effective conicity and gravitational stiffness, strongly influence the lateral dynamics of railway vehicles. The principal curvatures of wheel and rail profiles are important parameters in the determination of creep coefficients used in rail vehicle models. In general, these geometric constraints and profile curvatures are nonlinear functions of the wheelset lateral displacement. This report is a users' manual for a computer program written in FORTRAN IV that uses iterative procedures to determine these nonlinear functions for arbitrary wheel and rail profiles. The program computes the wheel/rail contact positions, geometric constraint functions, and profile curvatures for any given wheel profile, rail profiIe, rail cant angle, and rail gauge for an asymmetric wheelset on asymmetric rails. Analytical methods used and program input and output are described. Results are in the form of printout, punched cards and drum plotter plots. The users' manual includes program listings, sample deck set-ups, and sample run output.

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