LIU Zhi-wen1,2, LI Luo-xing1,2, XIAO Gang1,2, YAO Zai-qi3
(1.State Key Laboratory of Advanced Design and Manufacture for Vehicle Body, Hunan Univ, Changsha, Hunan410082, China; 2. College of Mechanical and Vehicle Engineering, Hunan Univ, Changsha, Hunan410082, China; 3. Zhejiang Geely Automobile Research Institute Co, Ltd, Hangzhou, Zhejiang311228, China)