路面不平整引起的车辆动载计算方法

Calculating method of vehicle dynamic load caused by uneven pavement

为了分析不平整路面上行驶车辆的动载特性,研究了西宝高速公路平整度实测结果,用正弦曲线模拟路面表面,建立了考虑汽车侧倾因素和轮胎阻尼的四自由度车辆振动模型,利用模态理论和编程计算对车辆振动模型在不同路面波长、不同振幅、不同行车速度及左右车轮激励不同时的动载进行了分析和求解,给出了车辆在不平整路面上行驶时产生的动载计算方法。计算结果表明:波形路面上产生的动荷载沿路线纵向呈波形分布,在路面上行驶的车辆对路面可能产生很大的动荷载,最大动荷载系数可达到2.0以上。

In order to analyze the dynamic load character of vehicle running on uneven pavement, the surface of pavement was simulated by using sinusoid according to the evenness measure result of Xi-Bao freeway, a four-free-degree model of vehicle vibration was set when vehicle lean factor and tire damping were considered, a calculating method of vehicle dynamic load was presented through analyzing and solving vehicle vibration problem by using modal theory and programming calculation, when the left and right wheels of vehicle were not impelled at the same time, and vehicles ran at different speeds on different pavement models with different wavelengthes and amplitudes. Calculation result indicates that vehicle dynamic load caused by waveform pavement shows waveform distribution in longitudinal direction, vehicle running on uneven pavement may produce great dynamic load, and the maximum coefficient of dynamic load is above 2. 0. 5 figs, 13 refs.