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Calculation of Critical Speed of Railway Vehicle by Multibody Dynamics Analysis

다물체 동역학 해석방법을 이용한 철도차량의 임계속도 계산

  • Kang, Juseok (Dept. of Railway Vehicle System Engineering, Korea Nat'l Univ. of Transportation)
  • 강주석 (한국교통대학교 철도차량시스템공학과)
  • Received : 2013.04.24
  • Accepted : 2013.09.11
  • Published : 2013.11.01

Abstract

In this analysis, a method is presented to calculate the critical speed of a railway vehicle by using a multibody dynamic model. The contact conditions and contact forces between the wheel and the rail are formularized for the wheelset model. This is combined with the bogie model to obtain a multibody dynamic model of a railway vehicle with constraint conditions. First-order linear dynamic equations with independent coordinates are derived from the constraint equations and dynamic equations of railway vehicles using the QR decomposition method. Critical speeds are calculated for the wheelset and bogie dynamic models through an eigenvalue analysis. The influences of the design parameters on the critical speed are presented.

Keywords

Multibody Dynamic Model;Critical Speed;Railway Vehicle;QR Decomposition Method

Acknowledgement

Supported by : 한국연구재단

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