分别以销轴和两维指向机构为研究对象，结合“接触-分离”两状态模型，采用多体系统动力学理论，得到含间隙铰的多体系统动力学方程。基于该方程，采用动力学仿真软件ADAMS对含间隙铰的动力学特性进行分析，得出了销轴在重力场和微重力场中不同转速下销轴中心的运动轨迹及销轴与套筒碰撞力的变化规律。仿真结果表明：重力释放对含间隙铰的运动轨迹、振动、穿刺深度、碰撞力、末端精度等都具有较大的影响。研究成果对含间隙机构的设计具有重要价值和意义。

The multibody system dynamic equations of pin and two-dimensional pointing mechanism with clearance are obtained by using “contact-separation” two-state model and the multibody system dynamic theory. Based on these equations, the dynamics characteristics are analyzed by using dynamic simulation software ADAMS. The trajectories center pin and collision force change regularities are obtained in gravity field and micro gravity field at different speeds. The simulation results show that the release of gravity has great influence on the trajectories, vibration, penetration depth, collision force and end-effector precision of clearance joint. The results have important value and great significance for clearance mechanism design.