油气悬架车辆振动非线性特性分析与仿真研究

Nonlinear Characteristics Analysis and Simulation on Vibration for Vehicle with Hydro-Pneumatic Suspensions

建立了二自由度汽车油气悬架系统模型,分析了油气悬架和车身模型的非线性特性。运用AMEsim仿真软件,通过模型对不同的激振频率的时域和频谱响应分析,验证了油气悬架非线性振动模型的正确性。仿真结果表明,系统产生了接近激振频率分数(或整数倍)的频率分量,造成亚谐波(或超谐波)共振,导致系统振动不稳定。

The non-linear characteristics of hydro-pneumatic suspension and car body model are analyzed in this paper, and two-degree-of-freedom vibration model of hydro-pneumatic suspension is modeled. Dynamic time domain and frequency response to different vibration frequency verify the correctness of the non-linear model by AMEsim simulation software. Results show that the unstable vibration state is due to subharmonic or ultraharmonic resonance produced by the frequency components which are close to the fraction or the integer times of excitation frequency in the system.