1. Yanshan University,Hebei Provincial Key Laboratory of Parallel Robot and Mechatronic System,Qinhuangdao,China,066004
2. Fudan University,Academy for Engineering & Technology,Shanghai,China,200433
3. Yanshan University,Hebei Provincial Key Laboratory of Parallel Robot and Mechatronic System and Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education of China,Qinhuangdao,China,066004