1. Ph.D. Student, School of Aeronautics, Northwestern Polytechnical Univ., Xi’an 710072, China.
2. Associate Professor, School of Aeronautics, Northwestern Polytechnical Univ., Xi’an 710072, China.
3. Senior Executive, China Coal Technology and Engineering Group, Beijing 100013, China.
4. Ph.D. Student, State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong Univ., Shanghai 200240, China.
5. Professor, School of Aeronautics, Northwestern Polytechnical Univ., Xi’an 710072, China (corresponding author).