1. Professor, School of Astronautics, Harbin Institute of Technology, Harbin 150001, PR China (corresponding author).
2. Ph.D. Student, School of Astronautics, Harbin Institute of Technology, Harbin 150001, PR China.
3. Lecturer, School of Electromechanical and Automotive Engineering, Yantai Univ., Yantai 264005, PR China.