为分析履带式工程车辆黏弹性悬架系统的非线件阻尼减振特性,根据其结构特点和非线性特征,建立该系统两自由度分段非线性振动模型,并由平均法推导出系统固有频率共振区附近的幅频特性方程.以装有黏弹性悬架的某300kW履式拖拉机为应用对象进行研究,分析系统在同有频率共振区附近的非线性特性和阻尼减振性能.讨论了激励幅值、地面刚度、悬架分段非线性刚度、分段线性阻尼系数、车体质量和幅频特性之间的关系,并提出改善系统减振性能的建议.该文的理论与分析方法,可为黏弹性悬架参数与系统减振性能的一致性优化设计提供参考.%To study the vibration reduction charaterstics of viscoelastic suspension system of crawler-type vehicle, the model of suspension system was built for two-degrees-of-freedom nonlinear osciliation according to its structural feature and nonlinear behavior. The approximate analytic solution of movement system was derived using the averaging method in the natuaral frequency section. Taking a 300 kW tracked tractor mounted with viscoelastic suspensions for instance, the nonlinear resonance characteristics and the performance of vibration damping reduction were investigated in the natuaral frequency section of vehicle system. The relationship between the nonlinear resonance charaterstics and system parameters, including the excitation amplitude, the stiffness and damping coefficients of viscoelastic suspension, the ground stiffness and the mass of vehicle body and suspension, were numerically analyzed. And the suggestion were given to improve the performance of vibration reduction. The model and analysis method are applicable to the matching design and optimization of viscoelastic suspension system.
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