1. School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China
2. CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China
3. Department of Mechanical and Electronic Engineering, Hefei University of Technology, Hefei 230009, China
4. Key Laboratory of Testing Technology for Manufacturing Process of Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China