1. Lecturer, Ningbo Research Institute, School of Mechanical Engineering, Zhejiang Univ., Ningbo 315100, China.
2. Professor, State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang Univ., Hangzhou 310027, China (corresponding author).
3. Professor, State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang Univ., Hangzhou 310027, China.
4. Associate Professor, Ningbo Research Institute, Zhejiang Univ., Ningbo 315100, China.