【摘要】 针对经典液压悬置集总参数模型无法准确反映固定解耦式液压悬置动特性的问题,分别提出了一种新的液压悬置集总参数模型和一种经典液压悬置集总参数模型的修正模型。两种模型中均考虑了解耦膜刚度对上液室体积柔度的影响,前者将解耦膜显式等效为一弹簧,增加了解耦膜刚度和等效泵吸面积两个参数;后者在经典集总参数模型基础上,根据解耦膜刚度对上液室体积柔度进行了修正,具有更简洁的表达形式。然后使用有限元分析方法辨识了解耦膜刚度和等效体积柔度,以及其余集总参数。最后将辨识得到的集总参数代入模型中后仿真计算发现,考虑解耦膜刚度以后,两种集总参数模型均可准确地预测固定解耦式液压悬置的动刚度和滞后角,而传统液压悬置的集总参数模型无法准确反映该类型液压悬置动态特性。更多还原

【Abstract】 Here, in order to improve dynamic characteristics prediction accuracy of a fixed decoupling hydraulic engine mount(HEM), a novel lumped parametric model and a modified lumped parametric model were proposed, respectively both considering effects of decoupling film stiffness on volume flexibility of upper liquid chamber, and the former made decoupling film be equivalent to an explicit spring with two added parameters of decoupling film stiffness and equivalent pump suction area, while the latter modified flexibility of upper liquid chamber with a more concise form according to decoupling film stiffness based on conventional lumped parametric model. Then the finite element method was employed to identify decoupling film stiffness, upper liquid chamber’s equivalent volume flexibility and other lumped parameters. Finally, all identified lumped parameters were substituted in the two models and to perform simulations. The results showed that both two proposed models can correctly predict dynamic stiffness and lagging angle of a fixed decoupling HEM, while the conventional lumped parametric model of HEM can’t do.更多还原