1. School of Aeronautics; Northwestern Polytechnical University; Xi'an 710072 China
2. Joint International Research Laboratory of Impact Dynamics and Its Engineering Application; Xi'an 710072 China
3. Shaanxi Key Laboratory of Impact Dynamics and Its Engineering Application; Xi'an, 710072 China
4. School of Astronautics; Northwestern Polytechnical University; Xi'an 710072 China