1. School of Mechanical Engineering, Harbin Institute of Technology, Harbin 150080, China
2. Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, China
3. Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, China
4. Guangdong Provincial Key Laboratory of Human-Augmentation and Rehabilitation Robotics in Universities, Southern University of Science and Technology, Shenzhen 518055, China