汽车悬架液压衬套非线性动特性的实验与建模方法研究

在不同振幅位移激励下，测试了一汽车液压衬套的动刚度、滞后角随频率的变化特性。建立了液压衬套动态特性分析的非线性集总参数模型，基于模型，探讨了液压衬套橡胶主簧、惯性通道与液压衬套动特性之间的关系，计算结果与实验结果的一致，验证了计算模型分析的正确性。分析建立的集总参数模型，表明液压衬套在不同位移振幅激励下，存储动刚度具有不动特征点及在高频激励下动刚度趋于定值的特性。基于这种特性发展了模型参数的辨识方法，并对液压衬套集总参数模型中的参数进行了识别，利用识别得到的参数对液压衬套的动特性进行了计算，验证了识别得到的参数的正确性。

Experiment and modeling of the nonlinear dynamic characteristics of a hydraulic bushing used in a vehicle suspension#br#

The dynamic characteristics of the hydraulic bushing, namely the dynamic stiffness and the loss angle, are crucial for the performance of the vehicle suspension. In the present work, the dynamic stiffness and the loss angle of a hydraulic bushing is tested and compared with the results predicted by a nonlinear lumped parameter model whose parameters are extracted by a parameter identification technique. Using the model, the effect of the main rubber and the inertia track on the dynamic stiffness and the loss angle is investigated. It is found the real part of the dynamic stiffness has a fix feature point while the magnitude of the dynamic stiffness tends to a certain constant value under the high frequency excitation. The good correlation suggests the validity of the model and the parameter identification implementation.