1. State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China
2. State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, China
3. Research Institute for Frontier Science, Beihang University, Beijing China
4. Laboratory of Aerospace Servo Actuation and Transmission, Beihang University, Beijing China