1. School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
2. Key Laboratory of Self-Lubricating Spherical Plain Bearing Technology of Hebei Province, Yanshan University, Qinhuangdao 066004, China
3. Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing, Yanshan University, Qinhuangdao 066004, China
4. School of Civil and Mechanical Engineering, Curtin University, Perth, WA 6845, Australia
5. Aviation Industry Corporation of Shenyang Aircraft Design and Research Institute, Shenyang 110000, China