1. Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, School of Mechanical Engineering, Tianjin University, Tianjin, China
2. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, China
3. Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, China
4. School of Electronic and Electrical Engineering, University of Leeds, Leeds, U.K.