1. School of Mechanical and Electrical Engineering , Putian University , Fujiang Province, Putian 351100 , China ; Email: wuzw1960@126.com
2. Patent Examination Cooperation Tianjin Center of the State Intellectual Property Office , Tianjin 300162 , China
3. School of Automotive and Mechanical Engineering , Changsha University of Science and Technology , Changsha 410114, Hunan Province , China