基于Matlab的雾霾天气下车辆制动模型动力学分析

Dynamic Analysis of Vehicle Braking Model in Fog and Haze Based on Mat Lab

为了得到不同雾霾天气下车辆制动时所需的制动距离及相关优化参数,降低雾霾天气的汽车事故发生率,通过划分雾霾天气下车辆的制动时间和分析每段制动时间的制动距离,建立了制动时间、制动减速度与制动距离之间的关系,并将建立的数学模型通过Matlab模拟分析,得到驾驶员反映时间、制动减速度与制动距离的关系仿真曲线,从而根据当前的天气状况参数(空气湿度、能见度),确定在此状况下车辆进行制动所需的制动距离。通过改变模型中车辆制动时初始速度、地面摩擦系数、驾驶员反应时间等参数,就可得到相对应的仿真模型,为研究车辆的制动提供便利。

In order to get the braking distance required for vehicle braking in different haze weather and the optimization pa- rameters so as to reduce the automobile accident rate in the fog and haze weather, relationship of the braking time, braking de- celeration and the braking distance is established through dividing the braking time in hazy weather and analyzing the braking distance in each braking time, and a mathematical model is established through analysis of the Matlab simulation, thus the re- lationship simulation curve between the driver reaction time, the braking deceleration and the braking distance is obtained. In that case, the required braking distance to vehicle in this situation could be determ!ned accordding to the current weather con- dition parameters （such as humidity, visibility, etc. ）. The corresponding simulation model can be obtained by changing the parameters such as the initial speed, ground friction coefficient, and the driver＇s reaction time, and so on, thus the study would provide convenience for the study of vehicle braking.