1. Professor, Institute of Applied Mechanics and Biomedical Engineering, Taiyuan Univ. of Technology, Taiyuan 030024, P.R. China (corresponding author).
2. Professor, Faculty of Science, Engineering and Technology, Swinburne Univ. of Technology, Hawthorn, VIC 3122, Australia.
3. Professor, Dept. of Mechanical Engineering, Embry-Riddle Aeronautical Univ., Daytona Beach, FL 32114.
4. Professor, Institute of Applied Mechanics and Biomedical Engineering, Taiyuan Univ. of Technology, Taiyuan 030024, P.R. China.