1. Department of Fluid Control and Automation, Harbin Institute of Technology, Harbin 150001, China
2. State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China
3. School of Energy Science and Engineer, Harbin Institute of Technology, Harbin 150001, China
4. Faculty of Engineering and Design, Hosei University, Tokyo 102-8160, Japan