YANG Ji-kuang1,2, QIN Zhen-yuan1,3,WANG Si-wen1,GU Guo-rong1
(1. State Key Laboratory of Advanced Design and Manufacture for Vehicle Body, Hunan Univ, Changsha, Hunan 410082, China;2. Dept of Applied Mechanics, Chalmers Univ of Technology, Sweden;3.National Coach Quality Supervision and Test Center, Chongqing 401122,China)