基于鬃毛摩擦理论的环形橡胶减振器动态迟滞特性模型

对环形橡胶减振器的动态特性进行了理论建模。综合考虑材料的高弹特性、频率相关动态特性以及摩擦相关动态特性,并将形状因素的影响考虑在内,提出了一种基于鬃毛摩擦理论的描述减振器动态迟滞特性模型。比较以往的基于库仑摩擦理论的模型,该模型具有对摩擦速度依赖特性的描述能力,且能够预测摩擦应力在零速附近的非线性特征,使得拟合出的动态迟滞特性曲线具有很多微小的波浪特征。开展了测量减振器径向动态迟滞特性的试验,试验结果表明:环形橡胶减振器的实际动态迟滞曲线并非光滑的椭圆环,而是具有很多细微波浪的近似椭圆环,且在激振频率偏高时,波浪特征相对明显,验证了基于鬃毛摩擦理论的理论模型与实际情况的规律和趋势一致、特征相似。 

Dynamic hysteresis characteristics model of rubber damping ringbased on bristle friction theory

The dynamic characteristics of rubber damping ring were theoretically developed. The high elastic properties, frequency-related dynamic properties and friction-related dynamic properties were comprehensively considered, and the effect of shape factors was taken into account as well; a model of rubber damping ring with dynamic hysteresis characteristics was presented based on the bristle friction theory. Compared with the former model based on Coulomb friction theory, this model could describe the dependence of friction velocity and calculate the nonlinear characteristics of friction stress nearby the point of zero velocity, producing a lot of tiny wave features to the dynamic hysteresis loops. Experimental research on the measurement of radial dynamic hysteresis characteristics was conducted. Experimental results show that the actual dynamic hysteresis loops of rubber damping ring are approximate elliptic curves with many tiny waves instead of smooth ones. And the wave characteristics of the hysteresis loops are relatively obvious at higher exciting frequencies. The experimental research proves that the rules and trends of theoretical model based on the bristle friction theory and actual situation are consistent, and their characteristics are similar.