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为提高公路路线设计指标的安全性和一致性,改变固有运行车速预测模型的建模思路,解决运行车速预测中公路线形指标的客观描述问题,通过分析运行车速与公路平、纵、横线形指标的相关性,提出公路线形空间综合指数的概念。应用模糊综合评判法,确定公路线形几何特性的模糊集,模型主要考虑的车速影响因素有平曲线半径、累计转角、曲线上位置比例、纵坡以及横坡等;运用层次分析法,确定各因素的权重,采用梯形和半梯形隶属函数,提出了服务于运行车速预测的公路线形指标空间客观描述模型;最后,应用实例进行了公路线形空间综合指标的计算说明。
In order to improve the safety and consistency of highway route design indexes and change the modeling idea of the inherent running speed prediction model, the objective description problem of highway alignment indicators in running speed prediction is solved. By analyzing the running speed and highway horizontal, vertical and horizontal linear indicators The paper proposes the concept of highway linear spatial composite index. Fuzzy comprehensive evaluation method is used to determine the fuzzy set of the geometric characteristics of the highway linearization. The main influencing factors of the vehicle speed are the flat curve radius, the accumulated angle, the position ratio on the curve, the longitudinal slope and the cross slope. By using AHP, The paper presents an objective description model of highway linear index space serving the prediction of running speed by using the trapezoidal and semi-trapezoidal membership functions. Finally, an example is given to illustrate the calculation of the comprehensive index of highway linear space.