1. Key Laboratory of Advanced Forging & Stamping Technology and Science (Yanshan University), Ministry of Education of China, Qinhuangdao, People’s Republic of China
2. School of Mechanical Engineering, Yanshan University, Qinhuangdao, People’s Republic of China
3. Aviation Key Laboratory of Science and Technology on Generic Technology of Self-lubricating Spherical Plain Bearing, Yanshan University, Qinhuangdao, People’s Republic of China