1. Faculty of Engineering and Industrial Sciences, Swinburne Univ. of Technology, Victoria 3122, Australia.
2. School of Mechanical and Aerospace Engineering, Nanyang Technological Univ., Singapore 639798 (corresponding author).
3. Institute of Applied Mechanics and Biomedical Engineering, Taiyuan Univ. of Technology, 79 W. Yingze St., Taiyuan 030024, China.
4. Shanghai Institute of Technology, 120 Caobao St., Shanghai 200235, China.