1. Research Associate, State Key Laboratory of Mechanical Transmission, Chongqing Univ., Chongqing 400044, China.
2. Professor, School of Mechanical and Electrical Engineering, Center for System Reliability and Safety, Univ. of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China (corresponding author).
3. Professor, State Key Laboratory of Mechanical Transmission, Chongqing Univ., Chongqing 400044, China.