机械结合面动态特性测试与仿真

Test and Simulation of Dynamic Characteristics of Joint Interface in Machine

机械系统的振动特性多依赖于其结合面的动态特性,以动力总成系统的螺栓联接结合面为研究对象,设计了模拟机械结合面动态特性的非标试验测试装置,经过多轮次的试验,确定了结合面切、法向刚度和阻尼的测试流程和参数识别方法,获得了接触压力、结合面材料和接触面状态等因素对结合面动态特性的影响规律。提出了薄层单元结合面等效计算模型,并基于试验测试数据,建立了考虑结合面影响的等效动力学模型。变速箱壳体组合模态的计算结果表明,该等效计算模型具有较高的计算精度和良好的工程适用性。

Vibration properties of many assembled mechanical systems depend on frictional damping in bolted joints. In this paper,the bolt joint interfaces of power-train are studied, and the nonstandard test device is designed. The testing process and parameter idenlification methods of shear stiffness, normal stiffness and damping are confirmed through many-times experiments. The influence law of dynamic characteristic of joint interface by contact press, material and contact states is obtained. Based on the test data, the thin film element equivalent mechanical model is proposed and the gear-box she]l equivalent calculation model which takes into account the interface effect is constructed. The modal analysis results indicate that the equivalent models have high precision and better engineering applicability.