1. School of Mechanical Electronic and Information Engineering, China University of Mining and Technology-Beijing 1 , Beijing, China
2. College of Mechanical and Electronic Engineering, Shandong University of Science and Technology 2 , Qingdao, China
3. School of Vehicle and Transportation Engineering, Tsinghua University 3 , Beijing, China
4. School of Mechanical and Equipment Engineering, Hebei University of Engineering 4 , Handan, China