1. State Key Laborotary of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu, People's Republic of China
2. National Rail Transit Electrification and Automation Engineering Technique Research Centre, Southwest Jiaotong University, Chengdu, People's Republic of China
3. SWJTU-Leeds joint school, Southwest Jiaotong University, Chengdu, People’s Republic of China