1. Associate Professor, Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, Shanghai Jiao Tong Univ., No. 800 Dongchuan Rd., Shanghai 200240, P.R. China (corresponding author).
2. School of Mechanical Engineering, Shanghai Jiao Tong Univ., No. 800 Dongchuan Rd., Shanghai 200240, P.R. China.