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为分析不同交通流密度下的车辆加速度变化规律,选取青岛市杭-鞍高架快速路为试验场地,利用视频检测技术采集试验路段不同点位的交通流样本,从视频中获取跟驰车队的车速、车头间距、速度差以及加速度等交通流数据。统计分析发现,加速度值域关于0点对称分布;不同交通流密度下加速度的分布具有各异性;车速、车头间距和速度差对加速度的影响程度随交通流密度的不同而不同。利用实测数据对加速度GM模型进行参数优化和拟合分析,结果验证了模型的合理性,样本平均拟合误差均小于5%。
In order to analyze the variation law of vehicle acceleration under different traffic flow density, Qingdao-Hangzhou-Shenyang Expressway is selected as the test site, and video detection technology is used to collect traffic flow samples at different points of the test section to obtain the speed of the following car from the video , Headway, speed difference and acceleration traffic flow data. The statistical analysis shows that the acceleration range is symmetrical about zero point, and the distribution of acceleration is different under different traffic flow densities. The influence of vehicle speed, headway distance and speed difference on acceleration is different with the density of traffic flow. The measured data is used to optimize and fit the acceleration GM model. The results verify the rationality of the model. The average fitting error of the samples is less than 5%.