基于键合图理论的发动机空气弹簧液压悬置建模及动特性分析

Modeling of engine air spring hydraulic mount based on bond graph theory and its dynamic characteristics analysis

为了研究发动机空气弹簧液压悬置的动态特性,提出了采用基于机电液耦合的键合图理论方法对发动机空气弹簧液压悬置进行建模,模型中考虑了惯性通道内液体的惯性系数,采用该模型对空气弹簧动特性进行了仿真研究。通过仿真和实验对比发现,空气弹簧的动刚度和阻尼角曲线与实验曲线趋势一致,在空气腔关闭时,弹簧悬置表现出大刚度大阻尼特性,动刚度最大值为480 N·mm-1,阻尼角最大值为50°。当空气腔开启时,空气弹簧悬置表现出小刚度小阻尼特性,动刚度最大值为270 N·mm-1,阻尼角最大值22°。

In order to study the dynamic characteristics of engine air spring hydraulic mount,In this paper,the theory of bond graph based on electro-hydraulic coupling is used to model the air spring hydraulic mount of engine.The model considers the inertia coefficient of the liquid in the inertial channel.The model is used to simulate the dynamic characteristics of the air spring mount.Through simulation analysis and experimental comparison,it is found that the dynamic stiffness and damping angle curves of the air spring mount are consistent with the experimental curve trend.When the air chamber is closed,the air spring mount exhibits a high stiffness and damping characteristic with a maximum dynamic stiffness of480N·mm^-1and a maximum damping angle of50°.When the air chamber is open,the air spring mount exhibits a low stiffness and damping characteristic with a maximum dynamic stiffness of270N·mm^-1and a maximum damping angle of only22°.