1. State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, People’s Republic of China
2. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, People’s Republic of China
3. School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu, People’s Republic of China
4. Center for System Reliability and Safety, University of Electronic Science and Technology of China, Chengdu, People’s Republic of China