液阻悬置动特性分析与性能优化  

Dynamic Characteristic Analysis and Performance Optimization of Hydraulic Mount

作　　者：刘通 江汇洋 刘艳华 赵晓亮 LIU Tong;JIANG Huiyang;LIU Yanhua;ZHAO Xiaoliang

机构地区：[1]华晨汽车工程研究院 [2]华晨雷诺金杯汽车有限公司

出　　处：《汽车工程师》2020年第10期22-26,共5页Automotive Engineer

摘　　要：针对液阻悬置具有复杂的非线性动态特性,并且会随着结构不同表现出差异化的隔振特点,精确的参数识别成为隔振分析的关键。根据流体动力学基本原理,建立液阻悬置的非线性力学模型,依据橡胶材料的超弹性,定义体积柔度的计算方法,推导出随振幅变化的动特性表达式;基于结构参数敏感度分析,重点讨论了参数敏感度对动刚度和损失角的影响。研究结果表明,结构参数改变,不仅可以改变动特性幅值,而且可以调整频率的分布;而改变体积柔度,可以很好地抑制橡胶材料的动刚度和损失角,与结构参数形成互补。通过实际案例中对不同样件的对比测试,液阻悬置悬后振动峰值由1.1 m/s^2降低到0.55 m/s^2。Aiming at the complex non-linear dynamic characteristics of hydraulic mount, it will show different vibration isolation characteristics with different structures, accurate parameter identification becomes a key to vibration isolation analysis.According to the basic principles of fluid dynamics, non-linear mechanical model of hydraulic mount is established. The volume flexibility is calculated according to the super elasticity of rubber material. The expression of dynamic characteristics with amplitude is derived. The effects of parameters on dynamic stiffness and loss angle are discussed based on sensitivity analysis of structure parameters. The results indicate that the change of structure parameters can not only change the amplitude of dynamic characteristics, but also adjust the frequency distribution. By changing the volume flexibility, the dynamic stiffness and loss angle of the rubber material can be well restrained, which is complementary to the structure parameters. Based on the comparative test of different samples in a project case, the vibration peak value of the body side of the hydraulic mount is reduced from 1.1 m/s^2 to 0.55 m/s^2.

关 键 词：液阻悬置 超弹性 振幅 体积柔度 

分 类 号：U464.13[机械工程—车辆工程]