粗糙度对接触界面动态特性的影响研究

Study of Rough Effect on Dynamic Characteristic of Contact Interface

接触界面的刚度和阻尼对机械结构的动态特性有重要影响,为了描述接触界面粗糙度对机械结构动态特性的影响,建立了振动应力波在粗糙接触界面传播的数学模型,并进行了数值仿真和模型试验。试验结果表明:较小的表面粗糙度有利于振动应力波通过接触界面传播;随着粗糙度值的增加,通过接触界面的振动应力波减少,说明较大的粗糙度界面消耗振动能量,但是产生了高次谐波,使振动状态变得复杂。

Contact interface stiffness and damping have an important influence on dynamic characteristics of the mechanical structure. In order to study on contact interface rough effect on dynamic characteristic of machinery, the model of vibration stress wave propagation was established in this paper. The test results show that small surface rough is benefit for vibration stress wave reducing through contact interface, with the surface rough increase, vibration stress wave reducing through contact interface. The larger roughness is benefit to impede vibration stress wave propagation at contact interface, but higher harmonic would be produced and the vibration state becomes complicated.