1. School of Mechanical and Electrical Engineering, China University of Mining and Technology, Xuzhou, China
2. School of Electrical and Control Engineering, Xuzhou University of Technology, Xuzhou, China
3. State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin, China
4. School of Mechatronic Engineering, Xuzhou College of Industrial Technology, Xuzhou, China