1. College of Aerospace Engineering, Chongqing University, Chongqing 400044, P. R. China
2. State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing 400044, P. R. China
3. State Key Laboratory of Reliability and Intelligence Electrical Equipment, Hebei University of Technology, Tianjin 300130, P. R. China
4. School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, P. R. China
5. Aerospace Engineering, Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates