【作者】 刘娟；

【导师】 杨少伟；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2007， 硕士

【摘要】 随着国家高速公路网的实施,高速公路建设的重心开始由平原地区向山区延伸。山区由于地形、地质条件复杂,环境保护工作难度大等因素的限制,不得不采用较大和较长的纵坡或组合坡段,由于汽车上坡速度降低过多,下坡速度增加过快,对高速公路的服务水平、交通安全产生较大的影响。本研究课题着重对运行速度进行研究。首先,根据实验结果及调研资料,结合未来一段时间载货车的发展趋势和事故车型的分析,确定了主导车型。通过对纵坡路段汽车行驶特性的研究,给出主导车型的有关特性。在大量实测数据的基础上,分析了纵坡路段货车的运行速度特征。其次,用理论公式推导得出计算纵坡路段运行速度的理论模型。选取载重10吨的东风重型货车作为代表车型,在实验场地进行了平路脱档滑行实验和加速性能试验,结合汽车动力学原理,利用回归分析的方法建立了汽车上坡路段运行速度的实验模型。最后,用VB6.0对这两种计算运行速度的方法编写了运算程序。并用实例说明了两种程序的用法,对计算结果进行了比较和分析。更多还原

【Abstract】 With the implementation of the present national highway network, the focus of highway construction shifted to the mountain area from the large and medium urban area. Because of the limitation of some factors, such as the terrain, geological conditions and the difficulties of environment protection, the mountainous area have larger and longer slope or combination of the slope. It brings greater impact on level of service and traffic safety in freeway because the speed of vehicle driving up is lower than much and the speed of vehicle driving down increase excessively quickly. This research topic emphatically conducts the research to the operation speed.First of all, based on the result of experiment and the investigation, combining with the development tendency of freight vehicle in a period time of future and the analysis of accident vehicle type, it has determined the leading vehicle type. Then the characteristics of leading vehicle type are put forward through the research of operational characteristics on the section of longitudinal slope. And based on massive measured data, the characteristics of the operation speed are analyzed when the freight vehicles are drove on the section of longitudinal slope.Next, the theoretical model to calculate the operation speed at Sections with Particular Longitudinal Slopes using the theoretical formula. We selected loaded 10t dongfeng heavy freight vehicle as representative vehicle type, have done slip gear and coasting experiments on flat load and accelerating performance tests. With vehicle dynamics theory, we have established a vehicle operation speed experimental model at sections with uphill using regression analysis method.Finally, the two procedures to calculate the operation speed has compiled, and the example explained the procedure usages, compared and analyzed the computed result.更多还原