考虑变刚度解耦膜的液压悬置动特性快速预测模型  

Fast Prediction Model for the Dynamic Characteristics of the Hydraulic Mount Considering the Decoupler Membrane's Stiffness Variation

作　　者：周大为 左曙光[1] 吴旭东[1] 王珺 ZHOU Dawei;ZUO Shuguang;WU Xudong;WANG Jun(School of Automotive Studies, Tongji University, Shanghai 201804, China;Pan-Asia Technical Automotive Center Co., Ltd., Shanghai 201201, China)

机构地区：[1]同济大学汽车学院,上海201804 [2]泛亚汽车技术中心有限公司,上海201201

出　　处：《华南理工大学学报（自然科学版）》2020年第6期8-15,共8页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家重点研发计划项目(2017YFB0103103);上海市汽车工业科技发展基金会资助项目(1609)。

摘　　要：针对液压悬置幅变特性难以计算的问题,提出了一种考虑解耦膜变刚度的固定解耦式液压悬置动特性快速预测模型。首先通过阐述固定式解耦膜的工作原理和特性,引入固定式解耦膜与金属笼的非线性接触力,依此建立固定解耦式液压悬置的集总参数模型;然后对解耦膜进行流固耦合有限元仿真,用分段函数描述解耦膜等效位移与非线性力的关系,并研究了解耦膜厚度、直径以及解耦膜与金属笼间隙等结构参数对变刚度特性的影响规律,采用BP神经网络建立了解耦膜刚度预测模型;最后,选择某固定解耦式液压悬置进行动态特性仿真计算,并与实测结果进行对比。结果表明:文中提出的模型是准确的,且可大大缩短液压悬置动态特性预测的计算时间。To deal with the difficulties in the amplitude-sensitive characteristics prediction,a novel fast prediction model for the dynamic characteristics of the hydraulic mount considering decoupler membrane's stiffness variation was proposed.Firstly,the working principles and characteristics of the hydraulic mount were clarified,and the nonlinear contact force between the decoupler membrane and its metallic cage was introduced to build a lumped parameter model for the hydraulic mount.Secondly,a fluid-structure-interaction finite element analysis on the decoupler membrane was carried out,and the relationship between the equivalent displacement and the nonlinear reaction force was described with a piecewise function.Moreover,the influences of the thickness,diameter of the decoupler membrane and the gap between the decoupler and its metallic cage on the stiffness variation characteristics were investigated.The BP neural networks was employed to establish the prediction model for the stiffness of decoupler membrane.Finally,the dynamic characteristics of a typical hydraulic mount with a fixed decoupler was numerically simulated,and the simulation results were compared with the measured results.The comparison results show that the proposed prediction model is more accurate,and it can largely reduce the time needed to calculate the dynamic characteristics of the hydraulic mount.

关 键 词：液压悬置 解耦膜 非线性接触力 集总参数模型 变刚度特性 

分 类 号：U461.4[机械工程—车辆工程]