1. State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P.R. China
2. Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3590, United States
3. Center for Efficiency and Performance Engineering, University of Huddersfield, Huddersfield HD1 3DH, United Kingdom