重型汽车行驶平顺性的建模与仿真分析

Modeling and Simulation Analysis of Ride Comfort for Heavy-Duty Truck

以三轴重型汽车十三自由度振动力学模型为研究对象,建立了重型汽车振动结构微分方程。分解六轮激励的路面功率谱矩阵,用特征值和对应特征向量表示。应用虚拟激励法理论构造了虚拟的六轮路面激励。在虚拟激励作用下,联合复模态分析方法给出了振动结构的虚拟的振动响应量。依据虚拟激励理论求取统计特性的方法,给出了真实振动响应量的功率谱和均方根值。对某三轴重型汽车进行了行驶平顺性仿真分析,结果表明,该方法较简单,为重型汽车的行驶平顺性分析提供了可行的方法。

Taken thirteen-degree of freedom vibration dynamics model of a three-axle heavy-duty truck as an example, vibration differential equation is constructed for a multi - axle heavy-duty truck. Road power spectrum matrix is resolved for six-wheel excitation and expressed as eigenvalues and eigenvectors. Pseudo six -wheel road excitations are constructed according to pseudo- excitation method. Pseudo vibration responses are given by complex mode analysis and pseudo- excitation method. Power spectrum and root mean square value of real vibration responses are given according to pseudo- excitation method. Simulation analysis of ride comfort is done for three- axle truck, the results have shown that the method is easy and suitable for modeling and simulation analysis for ride comfort of heavy-duty truck.