YANG Jing,XUE Chuan,LIU Kaimin,JIANG Wu,ZHANG Chunbiao,FENG Renhua
(1.State Key Laboratory of Advanced Design and Manufacture for Vehicle Body,Hunan University,Changsha 410082,China;2.Key Laboratory of Advanced Manufacturing Technology for Automobile Parts,Ministry of Education,Chongqing University of Technology,Chongqing 400054,China)