应用于空间站等航天器大型回转支撑机构的TBA轴承，由于其结构运动特点及其空间特殊环境，现役固体复合润滑方案不能可靠保证其在轨长寿命工作要求，在轨及相关地面试验也证实多种耐磨材料易剥落导致其润滑失效。为攻克上述难题，满足我国空间站等后续航天器建设需求，在集成上海宇航系统工程研究所和重庆大学机械传动国家重点实验室多年来在航天轴承研究及应用基础上，本项目拟开展TBA轴承摩擦学性能改进研究。首先制备出用于TBA轴承的新型复合涂层石墨烯-Au-MoS2，进一步通过实验和有限元模拟手段，揭示石墨烯含量、服役环境（真空、高低温和原子氧）和工况条件（载荷、随动和差动）等因素对复合涂层摩擦学性能影响规律，并通过遗传算法对复合涂层摩擦学性能进行评价优化，得到满足服役环境和工况要求的最优配比，为航天器TBA轴承摩擦磨损性能改进提供新的减摩理论和应用途径。

For a trundle bearing assembly (TBA bearing) used for large-scale spacecraft rotary joints like the airspace station, its existing solid composite lubrication scheme can not guarantee the long-life requirement of the bearing on orbit due to its special airspace environments and motion characteristics. The on-orbit and related ground tests have confirmed that the bearing surface coatings (Au and MoS2) are easily to peel off so as to bring out the lubrication failure. To overcome the above failure problems and meet the urgent needs of the construction of the coming airspace station and other spacecraft in China, this project intends to improve the tribological performance of the TBA bearing based on the researches and applications of airspace bearings in the Aerospace System Engineering Shanghai and the State Key Laboratory of Mechanical Transmission of Chongqing University for many years. Firstly, a new kind of coating used for the aerospace TBA bearing, graphene-Au-MoS2 composite coating is prepared, and further its tribological properties are studied using the associated experiment and finite element simulation. The purpose of the present study is to reveal effects of the graphene content, service environment (vacuum, atomic oxygen, high and low temperature) and working conditions (i.e., load, follow-up and differential conditions) of TBA bearing on the tribological properties of the coating. Further, the tribological performances of the TBA bearing with this coating are optimized using a genetic algorithm, so that its optimal proportioning scheme is obtained to meet the requirements of the service environments and working conditions for the TBA bearing. Through the above study, theoretical and application supports for antifriction dealing to improve the tribological performances of the TBA bearing for the aerospace rotary support mechanism in our country are desired to be achieved.