State-Degradation-Oriented Fault Diagnosis for High-Speed Train Running Gears System.

Chao Cheng,Hao Luo,Wanxiu Teng,Bangcheng Zhang,Guoli Cheng,Weijun Wang

doi:10.3390/s20041017

Abstract

As one of the critical components of high-speed trains, the running gears system directly affects the operation performance of the train. This paper proposes a state-degradation-oriented method for fault diagnosis of an actual running gears system based on the Wiener state degradation process and multi-sensor filtering. First of all, for the given measurements of the high-speed train, this paper considers the information acquisition and transfer characteristics of composite sensors, which establish a distributed topology for axle box bearing. Secondly, a distributed filtering is built based on the bilinear system model, and the gain parameters of the filter are designed to minimize the mean square error. For a better presentation of the degradation characteristics in actual operation, this paper constructs an improved nonlinear model. Finally, threshold is determined based on the Chebyshev’s inequality for a reliable fault diagnosis. Open datasets of rotating machinery bearings and the real measurements are utilized in the case studies to demonstrate the effectiveness of the proposed method. Results obtained in this paper are consistent with the actual situation, which validate the proposed methods.

Highlights

Nowadays, railway construction and operation are high-speed, which considerably affects the sustainability and the rapid progress of the national economy
Aiming at solving the above problems, this paper proposes a distributed state estimation filter, which is combined with system state degradation characteristics to achieve fault diagnosis
This paper proposes a method based on the Wiener state degradation process and multi-sensor filtering for running gears system diagnosis

Summary

Introduction

Railway construction and operation are high-speed, which considerably affects the sustainability and the rapid progress of the national economy. As a core system that directly affects the smooth running of high-speed trains, the running gears system is a key component of the train in providing dynamics and traction performance and has the functions of buffering, vibration isolation, generating power and supporting the vehicle body. As a matter of fact, the running gears system is a complex system that is coupled with many components. Among those components, the corrosion, shedding and degradation of one component may spread the local fault and propagate into a major fault in the system level, which may cause unexpected losses. The timely diagnosis of a running gears system plays a key role in ensuring the safe operation of trains

Objectives

Results

Conclusion