考虑幅变特性的发动机液压悬置物理模型建模方法研究

A Study on Physical Modeling Method of Engine Hydraulic Mount Considering the Amplitude-dependence Characteristic

发动机液压悬置作为汽车重要的隔振元件,主要由橡胶和液压模块两部分组成。橡胶部分可以有效衰减发动机的振动,液压模块可以通过内部流道共振产生较大的阻尼,从而有效地抑制来自路面的冲击。文章对发动机液压悬置的物理结构和材料特性进行分析,采用Coulumb摩擦模型以及Kelvin-Voigt模型表征橡胶材料的内部摩擦以及黏弹性特性。在考虑流道结构和油液特性的基础上建立液压模块的物理模型,通过仿真得到了液压悬置的动刚度和滞后角。最后,通过试验验证了文章的建模方法,并研究了关键物理参数对液压悬置动刚度和滞后角的影响。

As an important component for vibration isolation,engine hydraulic mount is consisting with rubber and hydraulic module.Rubber can attenuate the engine vibration effectively and the impact from rough road is inhibited by the hydraulic module through the resonance of liquid in the inertial channel.The physical structure and material characteristics of the engine hydraulic mount are analyzed in this paper.The Coulomb friction model and Kelvin Voigt model are used to characterize the internal friction and viscoelastic properties of rubber materials.The physical model of the hydraulic module is established on the basis of the flow channel structure and oil characteristics,and the dynamic stiffness and lag angle of the hydraulic mount are obtained by simulation.Finally,the modeling method of this paper is verified by experiments,and the influence of key physical parameters on the dynamic stiffness and hysteresis of the hydraulic mount is studied.