摘要
路阻函数在交通分配过程中左右着路径的选择,目前广泛采用的路阻函数是美国公路局提出的BPR函数,但笔者在交通分配的实践过程中使用美国公路局推荐BPR参数得到的结果并不理想。论文推导了路段流量和路段通行时间之间的关系式,比较了BPR函数和推导关系式之间的差异,对推导关系式进行了指数抛物线拟合,并具有良好的效果(相关系数0.99),拟合方程可以作为路阻函数代替BPR函数。论文还对非拥挤路网的BPR函数参数进行了拟合,并获得较好效果。
Link Performance Function is a key factor to traffic assignment, and BPR function is one widely used, but the result is not satisfying when BPR function is used in some cases with its default parameter alfa and belta which are recommended by U. S Bureau of Public Roads. The paper deducted the relationship between link flow and travel time on link and save an equation to express it. Comparing the equation with BPR hmction, it was found that there existed great difference between them. In order to find a function to replace the BPR function, an exponent parabolic regression equation is presented by regression method. In addition, the alfa and belta parametern of BPR funcition are gotten by means of regression method.
出处
《公路交通科技》
CAS
CSCD
北大核心
2006年第4期107-110,共4页
Journal of Highway and Transportation Research and Development
关键词
路阻函数
BPR函数
通行能力
抛物线拟合
Link Performance Function
BPR function
Capacity
Parabolic regression
