城市机动车尾气扩散过程三维动态可视化研究

Study on vehicle exhaust dispersion simulation and volume visualization

为研究城市机动车尾气扩散规律并寻求空气质量的改善措施,该文提出一种针对机动车尾气扩散过程的三维动态可视化表达方法。研究了CALINE4模型,顾及了道路特征和风向;模拟城市道路机动车尾气扩散过程,生成时间序列的体过程数据,从而得到CO、NOx等机动车污染气体的扩散及分布情况;利用光线投射算法进行直接体绘制。该方法能够有效模拟机动车尾气的扩散情况,并实现三维动态可视化。最后通过实验模拟一条道路的机动车尾气扩散情况,对道路机动车尾气扩散可视化结果进行分析,验证本文选取方法的有效性和可行性。

In order to study the law of vehicle exhaust diffusion and seek the improvement measures of air quality,a three-dimensional dynamic visualization method for vehicle exhaust diffusion process is proposed. Firstly,the CALINE4(California line source dispersion model-4) model is studied,taking into account the road characteristics and wind direction. Then,the diffusion process of vehicle exhaust gas on urban road is simulated,and the volume process data of time series is generated,so as to obtain the diffusion and distribution of CO,NOx and other vehicle pollutants. Finally,ray casting algorithm is used for direct volume rendering. This method can effectively simulate the diffusion of vehicle exhaust and realize three-dimensional dynamic visualization. Finally,through the simulation of a road vehicle exhaust diffusion,the visual results of road vehicle exhaust diffusion are analyzed to verify the effectiveness and feasibility of this method.