1. Department of Industrial Engineering, Tsinghua University, Beijing, P.R. China
2. State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science & Technology (HUST), Wuhan, P.R. China
3. Transportation College, Jilin University, Changchun, P.R. China
4. State Key Laboratory of Fluid Power & Mechatronic Systems, Zhejiang University, Hangzhou, P.R. China