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Shock and Vibration
Volume 2017 (2017), Article ID 1526373, 9 pages
https://doi.org/10.1155/2017/1526373
Research Article

On the Critical Speed, Supercritical Bifurcation, and Stability Problems of Certain Type of High-Speed Rail Vehicle

1Department of Mechanical Engineering, Chengdu University, Chengdu, China
2Traction Power State Key Laboratory, Southwest Jiaotong University, Chengdu, China

Correspondence should be addressed to Hao Dong

Received 8 February 2017; Revised 3 May 2017; Accepted 18 June 2017; Published 19 July 2017

Academic Editor: Longjun Dong

Copyright © 2017 Hao Dong and Qunsheng Wang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Recently, Chinese engineers have proposed a simple way to find the vehicles’ critical speed, which is similar to the ramping method. In this article, through an example of vehicle of supercritical properties, it is proved that the new easier way is not scientifically justified and should not be used in engineering practice. In addition, the ramping way also yields inaccurate critical speed. Then one abnormal vibration phenomenon which appears on Beijing-Shanghai high-speed line is studied. The results demonstrate that it is car body hunting but not bogie hunting. Finally, through the computation and comparison of the lateral ride indices under different conditions, one stability problem about stochastic limit cycle banding is tentatively discussed.