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针对空间飞行器对接框结构工作时拉压载荷特点,采用周向双弹簧等效接触模型进行对接框接触界面刚度等效,建立对接框结构在压力载荷和弯矩载荷作用下结构的接触界面刚度计算解析模型。基于弹性力学和Hertz及分形理论分别推导了对接框锁钩与接触面等效弹簧刚度,研究了变载荷作用下对接框接触界面刚度的变化特性,并利用对接试验平台对刚度模型进行了验证。结果表明:对接框在受压力载荷时刚度随载荷非连续增加,在载荷与预紧力相等时接触界面刚度发生突变;弯矩载荷时刚度随载荷的增加而接近于线性增大。该结果可为空间飞行器动力学特性分析中接触界面刚度等效提供参考。
Aiming at the characteristics of tension and compression load during the operation of the spacecraft docking frame structure, the equivalent double-spring contact model is used to carry out the equivalent stiffness of the contact interface of the docking frame, and the analytical model of the interface stiffness of the structure under the load and bending moment loads is established . Based on the theory of elasticity and Hertz and fractal, the equivalent spring stiffness between the hook and the contact surface of the box is deduced respectively. The variation of the interface stiffness under the varying load is studied. The stiffness model is verified by the docking test platform. The results show that the stiffness of the abutting frame increases non-continuously with the load under compressive load, and the interface stiffness changes abruptly when the load and the pretension force are equal. The stiffness increases with the increase of the load and approaches the linear increase when the load moment increases. The result can provide a reference for the stiffness of the contact interface in the dynamics analysis of spacecraft.