The dynamic contact characteristics of mechanical interface significantly impact the performance of machine tools. The static contact behaviors of mechanical interface have been studied. However, most mechanical interfaces are exposed to dynamic load. It is necessary to study the dynamic contact characteristics of mechanical interface. A normal dynamic microcosmic contact model is built using the statistical method, and the interactional effects of adjacent asperities are considered. The influences of the normal preload, vibrational frequency and displacement amplitude on normal contact stiffness and damping of mechanical interface are revealed. The predicted contact stiffness and damping of mechanical interface are verified by a series of simulations and experiments.

机械接口的动态接触特性极大地影响了机床的性能。研究了机械界面的静态接触行为。但是，大多数机械接口都承受动态负载。有必要研究机械接口的动态接触特性。使用统计方法建立正常的动态微观接触模型，并考虑相邻粗糙物的相互作用。揭示了法向预紧力，振动频率和位移幅度对法向接触刚度和机械界面阻尼的影响。通过一系列的模拟和实验验证了预测的机械界面接触刚度和阻尼。