车辆碰撞行人交通事故的不确定因素研究

车辆碰撞行人交通事故牵涉较多的不确定因素,如接触点位置与摩擦系数、人体的飞行距离、抛出高度和角度,根据这些取值不确定的参数估算碰撞速度,其结果具有较大的不确定性。为了考察碰撞速度的不确定取值范围,研究了行人事故所包含的各种不确定因素,利用多元函数的相对不确定理论,针对碰撞速度的一般运动学计算模型建立了相应的不确定度分析方法;给出了关于一起真实事故的应用实例。结果表明:人体与路面间摩擦系数的取值对计算结果不确定度的影响最显著。

Study of uncertain factors in traffic accidents of vehicle impacting pedestrian

There are many uncertain factors in a traffic accident of vehicle impacting pedestrian, such as collision point position and friction coefficient of road surface, flight distance, throw height and angle of body. According to the factors with uncertain value,the impact velocity can be estimated with much more uncertainty. To probe the scope of uncertainty value,all the uncertain factors in a pedestrian accident are investigated. The uncertainty analysis method on common kinematics algorithm of impact velocity is developed through the relative uncertainty theory of multifunction. An example about an actual accident is presented. The conclusion shows that the friction coefficient between body and road surface has the most obvious influence on the uncertainty of calculation result.