1. School of Construction Machinery, Chang’an University, Xi’an 710064, China
2. College of Mechanical & Electrical Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China
3. School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China
4. School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China