1. State Key Laboratory of Fluid Power & Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, China
2. College of Mechanical and Electrical Engineering, China Jiliang University, Hangzhou, China
3. Zhiyuan Research Institute, Hangzhou, China
4. Department of Mechanical Engineering, University of Bath, Bath, U.K.
5. Department of Mechanical and Aerospace Engineering, Rutgers University, Piscataway, NJ, USA