1. School of Automobile and Traffic Engineering, Hefei University of Technology, Hefei, Anhui, PR China;
2. Ministry of Education, Key Laboratory of Advanced Manufacture Technology for Automobile Parts, Chongqing University of Technology, Chongqing, PR China;
3. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha, PR China