1. School of Mechanical Engineering, Yanshan University, Qinhuangdao, P. R. China
2. Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing, Yanshan University, Qinhuangdao, P. R. China
3. Tianjin Jingwei Hirain Technologies Co.,Ltd., Tianjin, P. R. China
4. Key Laboratory of Self-Lubricating Spherical Plain Bearing Technology of Hebei Province, Yanshan University, Qinhuangdao, P. R. China
5. School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, P. R. China
6. Beijing Xinghang Mechanical and Electrical Equipment Co., Ltd., Beijing, P. R. China