1. School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, China
2. Key Laboratory of Service Environment and Intelligent Operation & Maintenance of Rail Transit, Gansu Province (Lanzhou Jiaotong University), Lanzhou, China
3. Train and Track Research Institute, State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu, China
4. School of Mechanical & Electrical Engineering, Xi’an Traffic Engineering Institute, Xi’an, China