1. a School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, Guangdong 510640, P. R. China;, Email: ysguan@scut.edu.cn
2. b School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, Guangdong 510640, P. R. China, Department of Computing Science, University of Alberta, Edmonton, AB, Canada
3. c School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, Guangdong 510640, P. R. China
4. d School of Aeronautics Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing, P. R. China