汽车液压阻尼器的四段线性化模型

Four-Linear Model of Hydraulic Damper Used in Car

通过对现有某车用液压阻尼器的实验研究和车辆悬架系统动力学仿真研究 ,发现这种阻尼器的动力学特性存在复杂的非线性行为。为准确描述这类阻尼器的动力学特性和进行汽车悬架系统的动力学仿真研究 ,本文根据阻尼器的实验数据 ,提出一种新型四段线性化阻尼器模型 ,并建立其相应的数学模型。通过汽车悬架系统的动力学仿真研究表明 ,采用四段线性化阻尼器模型 ,汽车悬架系统簧载质量在不同路面不平度函数作用下的加速度响应和均方根加速度响应随频率变化不会出现大的波动。与等效线性化阻尼器模型相比 ,四段线性化阻尼器模型 ,能较好降低汽车悬架系统簧载质量的加速度响应和均方根加速度响应 ,有利于提高汽车乘坐舒适性和行驶稳定性 。

This paper presents a new mathematical model of hydraulic dampers for cars. Through Measuring the dampers, we get a curve about velocity and damping force by MTS. A new model known as four linear damper model is established according to this curve. Simulation of a 1/2 car model is performed, using four linear damper model and equivalent linear damper model in the 1/2 car model. The results of simulation indicates that the dynamic characteristics of four linear model is in close agreement with the experimental. The four linear model is asymmetric about velocity. It is helpful for designing the damper used in car.