1. School of Mechanical Engineering, Yanshan University, Qinhuangdao, People’s Republic of China
2. Key Laboratory of Self-Lubricating Spherical Plain Bearing technology of Hebei Province, 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
4. School of Civil and Mechanical Engineering, Curtin University, Perth, Australia