1. State Key Laboratory of Performance Monitoring Protecting of Rail Transit Infrastructure, East China Jiaotong University, Nanchang 330013, China
2. School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang 330013, China
3. State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300401, China
4. Key Laboratory of Nondestructive Testing, Fujian Polytechnic Normal University, Fuqing 350300, China