1. a Institute of Automobile Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
2. b Institute of Automobile Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
3. c Institute of Automobile Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
4. d State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, P. R. China