Technical Reports

The Application of Quasi-Linearization Techniques to Rail Vehicle Dynamic Analyses

  • 01
  • Nov
  • 1978
AUTHOR: Federal Railroad Administration
OFFICE: RPD
SUBOFFICE: RPD-30
REPORT NUMBER: DOT/FRA/ORD-78/56
KEYWORDS: The Application of Quasi-Linearization Techniques to Rail Vehicle Dynamic Analyses; Rail Vehicle Dynamics; Quasi-Linearization; Describing Function Analysis
ABSTRACT: The objective of the work reported here was to define methods for applying the describing function technique to realistic models of nonlinear rail cars. The describing function method offers a compromise between the accuracy of nonlinear digital simulation and the computational efficiency of linear methods. This work entailed the development of realistic describing function representations for nonlinearities such as the wheel/ rail contact interaction and the development of algorithms for using these describing functions to predict the occurrence and stability of hunting and the forced response of rail vehicles to sinusoidal and statistical track irregularities. This report explains the describing function technique, demonstrates how it can be applied to nonlinear rail vehicle dynamics problems, describes algorithms that can be used for such problems, and presents results for typical nonlinear problems, including wheel profile and suspension nonlinearities.

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