1. Key Laboratory of Road Construction Technology and Equipment Ministry of Education, Chang'an University, Xi'an, China
2. School of Civil Aviation, Northwestern Polytechnical University, Xi'an, China
3. Guangdong Key Laboratory of Precision Equipment and Manufacturing Technology, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, China
4. College of Mechanical and Vehicle Engineering, Hunan University, Changsha, China