1. College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580, China
2. College of New Energy, China University of Petroleum, Qingdao 266580, China
3. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China
4. State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China