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Mathematical Problems in Engineering
Volume 2014, Article ID 324743, 13 pages
http://dx.doi.org/10.1155/2014/324743
Research Article

Fault Diagnosis for Compensating Capacitors of Jointless Track Circuit Based on Dynamic Time Warping

1Tsinghua National Laboratory for Information Science and Technology, Beijing 100084, China
2Department of Automation, Tsinghua University, Beijing 100084, China

Received 31 January 2014; Accepted 17 February 2014; Published 25 March 2014

Academic Editor: Hamid R. Karimi

Copyright © 2014 Wei Dong. 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

Aiming at the problem of online fault diagnosis for compensating capacitors of jointless track circuit, a dynamic time warping (DTW) based diagnosis method is proposed in this paper. Different from the existing related works, this method only uses the ground indoor monitoring signals of track circuit to locate the faulty compensating capacitor, not depending on the shunt current of inspection train, which is an indispensable condition for existing methods. So, it can be used for online diagnosis of compensating capacitor, which has not yet been realized by existing methods. To overcome the key problem that track circuit cannot obtain the precise position of the train, the DTW method is used for the first time in this situation to recover the function relationship between receiver’s peak voltage and shunt position. The necessity, thinking, and procedure of the method are described in detail. Besides the classical DTW based method, two improved methods for improving classification quality and reducing computation complexity are proposed. Finally, the diagnosis experiments based on the simulation model of track circuit show the effectiveness of the proposed methods.