液压衬套与液阻悬置作用机理的对比分析

Comparison of Working Mechanisms of Hydraulic Damped Bushings and Hydraulic Engine Mounts

建立了液压衬套与液阻悬置的集总参数模型,比较了两者的连续方程、动量方程及传递力方程.通过分析对应的等效机械模型,对比了惯性通道内液体的等效质量及阻尼的放大倍数.推导了惯性通道内流量响应及液室内压强响应的方程,阐释了两者作用机理的差别.在谐波激励下,对比了液压衬套与液阻悬置特征参数点及阻尼比取值范围的不同.研究表明,通过改变液压衬套的体积柔度参数,可使液压衬套的模型适用于液阻悬置的动态特性分析.最后通过实验验证了计算分析的正确性.

First, the lumped parameter models of hydraulic bushings and hydraulic engine mounts are established, and the two hydraulic devices are compared in terms of the continuity equation, the momentum equation and the transfer force equation.Next, by analyzing corresponding equivalent mechanical models, both the equivalent mas-ses of the liquid in inertia channels and the magnification of the damping of the two hydraulic devices are com-pared.Then, the equations of the pressure and flow response of the two hydraulic devices are derived and com-pared to interpret the difference in the working mechanisms of the two hydraulic devices.Moreover, under a har-monic excitation, the feature parameter and damping ratio of the two hydraulic devices are extracted and compared. It is found that changing the flexibility parameter of the hydraulic bushings can make the model suitable for the dy-namic performance analysis of the hydraulic engine mounts.Finally, the proposed models and the analysis meth-ods are proved to be correct by an experiment.