考虑连接部刚度的调焦机构组件动力学特性分析

Dynamic characteristics of a focusing mechanism component in consideration of joint stiffness

为了研究连接部刚度对调焦机构组件动力学特性的影响,采用弹性力学中的赫兹接触理论计算直线滚动导轨和滚珠丝杠螺母副刚度,分析预紧力与连接部刚度之间的关系,把刚度值嵌入到Ansys Workbench软件的Bushing连接刚度矩阵中,建立了考虑连接部刚度的调焦机构组件的动力学模型。针对不同的连接部刚度值进行了动力学仿真,通过仿真结果给出了满足组件最大振动位移响应的刚度值条件,为合理设计和调整调焦机构,提高调焦机构的动力学性能提供了理论依据,具有很好的工程应用参考价值。

In order to study the effects of joint stiffness on the dynamic characteristics of a focusing mechanism component, the stiffnesses of the ball screw assembly and the linear rolling guide pair were calculated by using the Hertz contact theory. The relationship between the preload and joint stiffness were analyzed. Then the stiffness value was incorporated into the Bushing joints stiffness matrix of the Ansys Workbench, so that the dynamic model of the focusing mechanism component in consideration of joint stiffness was established. A dynamic simulation was carried out by taking different joint stiffness values. Based on the simulation results, the stiffness conditions satisfying the maximum vibration displacement response of the component were given. It provides a theoretical basis for reasonably designing and adjusting the focusing mechanism and improving the dynamic performance of the focusing mechanism. The results give a good reference for engineering application.