1. Nanjing University of Aeronautics and Astronautics, Nanjing, P.R. China
2. State Key Lab of CAD&CG, Zhejiang University, Hangzhou, P.R. China
3. School of Engineering, Lishui University, Lishui, P.R. China
4. School of Mechanical Science & Engineering, Huazhong University of Science and Technology, Wuhan, China