1. School of Electro-Mechanical Engineering, Shaanxi University of Science and Technology, Xi’an, China
2. School of Electrical and Control Engineering, Shaanxi University of Science and Technology, Xi’an, China
3. School of Electro-Mechanical Engineering, Xidian University, Xi’an, China
4. College of Electronic and Information Engineering, Heibei University, Baoding, China
5. Department of Automation and Key Laboratory of System Control and Information Processing, Shanghai Jiao Tong University, Shanghai, China