1. Lab of Locomotion Bioinspiration and Intelligent Robots, College of Mechanical and Electrical Engineering, and College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China.
2. State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China.