1. School of Mechatronics Engineering, Northwestern Polytechnical University, Xi’an, P. R. China
2. School of Mechanical & Power Engineering, Zhengzhou University, Zhengzhou, P. R. China
3. China Luoyang Bearing Research Institute Co., Ltd., Luoyang, P. R. China
4. School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang, P. R. China
5. Shanghai Aerospace Control Technology Research Institute, Shanghai, P. R. China