State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China;
State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China;
School of Mechanical Engineering, Sichuan University of Science & Engineering, Zigong 643000, China;
State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China;