1. Key Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South University, Changsha, China
2. Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Central South University, Changsha, China
3. Key Lab. for Precision and Non-traditional Machining Technology of Ministry of Education, School of Mechanical Engineering, Dalian University of Technology, Dalian, China
4. School of materials, Hunan Industry Polytechnic, Changsha, China