1. Ph.D. Student, State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing Univ. of Aeronautics and Astronautics, 29 Yudao St., Nanjing 210016, P.R. China.
2. Lecturer, State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing Univ. of Aeronautics and Astronautics, 29 Yudao St., Nanjing 210016, P.R. China.
3. Professor, State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing Univ. of Aeronautics and Astronautics, 29 Yudao St., Nanjing 210016, P.R. China.
4. Professor, State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing Univ. of Aeronautics and Astronautics, 29 Yudao St., Nanjing 210016, P.R. China (corresponding author).