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提出了一种基于圆盘挤压模式的小位移磁流变液阻尼器模型,得出了挤压流动的微分方程,建立了Navier边界滑移条件和边界相容条件;利用双粘度本构模型,推导出挤压作用下不同位置的径向速度分布、径向压力分布,确定了牛顿流动区和宾汉流动区的分界面,计算了随着外加电流变化的圆盘挤压力的数学表达式。为了验证理论推导的正确性,按照发动机隔振系统的技术要求,设计制造了基于圆盘挤压模式的小位移磁流变液阻尼器,利用MTS8701电液伺服激振控制台进行了测试。结果表明:得出的试验阻尼力与理论阻尼力基本符合,采用提出的分析方法来计算圆盘挤压力是可行的,该方法对挤压模式的磁流变液阻尼器设计有一定的参考价值。
A small displacement MR fluid damper model based on disc squeeze mode is proposed. Differential equations of squeezing flow are obtained, Navier boundary slip conditions and boundary conditions are established. By using the double-viscosity constitutive model , The radial velocity distribution and radial pressure distribution at different positions under compression were deduced, the interface between Newtonian flow field and Bingham flow zone was determined, and the mathematical expression of disk squeezing force with applied current was calculated formula. In order to verify the correctness of the theoretical derivation, a small displacement magnetorheological fluid damper based on disc extrusion mode was designed and manufactured according to the technical requirements of the vibration isolation system of the engine. The MTS8701 electro-hydraulic servo excitation console was used to test. The results show that the experimental damping force is in good agreement with the theoretical damping force. It is feasible to calculate the disc squeezing force by using the proposed analysis method. This method has some reference to the design of squeeze mode MR damper value.