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通过数值仿真和实验,研究了非线性汽车悬架的混沌特性.建立了路面双频拟周期激励作用下的单自由度汽车悬架模型,通过数值仿真,给出了悬架振动的时间历程曲线、自功率谱密度图形和Poincare截面,从理论上说明汽车悬架振动是混沌的.进行振动实验,获取实验汽车悬架的振动数据,对其计算了一阶固有频率和混沌参数如关联维、Kolmogorov熵和最大Lyapunov指数,从而验证了汽车悬架振动的混沌特征.为汽车悬架的优化设计和建立悬架隔振性能混沌评价新方法提供了理论依据.
Through the numerical simulation and experiment, the chaotic characteristics of the nonlinear automotive suspension are studied.The single-degree-of-freedom automobile suspension model under the quasi-periodic excitation of the pavement is established, and the time history curve of the suspension vibration is given through numerical simulation , Self-power spectral density graph and Poincare section, the vibration of the automobile suspension is theoretically proved to be chaotic. Vibration experiments are conducted to obtain the vibration data of the experimental vehicle suspension. The first-order natural frequency and chaotic parameters such as correlation dimension, Kolmogorov entropy and maximum Lyapunov exponent, which verifies the chaotic characteristics of vehicle suspension vibration and provides a theoretical basis for the optimization design of the vehicle suspension and the establishment of a new method of chaos evaluation of suspension vibration isolation performance.