固定解耦式液压悬置集总参数建模及模型修正  

Lumped parametric modeling and model modification for fixeddecoupling hydraulic engine mount

作　　者：周大为 左曙光[1] 王珺[1] 胡坤[1] 吴旭东[1] ZHOU Dawei;ZUO Shuguang;WANG Jun;HU Kun;WU Xudong(Clean Energy Automotive Engineering Center,Tongji University,Shanghai 201804,China)

机构地区：[1]同济大学新能源汽车工程中心,上海201804

出　　处：《振动与冲击》2020年第5期32-36,共5页Journal of Vibration and Shock

基　　金：上海市汽车工业科技发展基金会项目(1609)。

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。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.

关 键 词：液压悬置 固定式解耦膜 参数辨识 集总参数模型 

分 类 号：U463.1[机械工程—车辆工程]