1. College of Electrical and Control Engineering, College of Mechanical Engineering, Xi'an Key Laboratory of Electrical Equipment Condition Monitoring and Power Supply Security, Xi'an University of Science and Technology, Xi'an, China
2. College of Electrical and Control Engineering, Xi'an Key Laboratory of Electrical Equipment Condition Monitoring and Power Supply Security, Xi'an University of Science and Technology, Xi'an, China
3. School of Automation Science and Engineering, Faculty of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, China