基于人-车-路三自由度振动模型的路面平整度评价方法

为了更准确地评价路面的行车舒适性,以乘客的竖向加权加速度均方根值作为平整度评价指标,将人-车-路组成的系统简化成三自由度振动模型,依据牛顿法建立了振动微分方程,采用传递矩阵法对其进行了求解,进而建立了考虑人-车-路相互作用的路面平整度评价方法。结果表明,该评价方法能考虑不同路面类型以及公路等级的影响,对于不同等级路面的评价结果与实际情况一致,而国际平整度指数、功率谱密度和平整度标准差在部分工况下不能很好地描述路面的舒适性。

Pavement Roughness Evaluation Method Based on Three-Degree-Freedom Models Including Human,Vehicle and Road

In order to evaluate the riding comfort of the pavement more accurately,the weighted root-mean-square acceleration of the passenger is selected as evaluation index;the human-vehicle-road system is simplified into a three-degree-freedom vibration model and according to Newton's law,the vibration differential equations are established and solved by transfer matrix method.As a result,the evaluation method for pavement roughness based on human-vehicle-road interaction is proposed.The analysis results show that the evaluation results of the method proposed are consistent with the actual conditions,for it can consider the impacts of pavement types and highway grades.But the international roughness index,the power spectral density and the standard deviation of roughness can't describe the driving comfort well under partial conditions.