基于加速度的公路线形连续性评价研究
发布时间：2018-10-15 07:57
【摘要】：公路线形应保证行车安全、快速、经济、舒适，这就要求其具有良好的设计连续性。线形连续性包括行驶速度的连续性、视觉的连续性和加速度的连续性，，连续的公路线形能与驾驶员的期望相适应。现行的相关规范和指南中对公路线形连续性评价是建立在运行速度的基础上的，通过相邻路段车辆运行速度差评价公路线形连续。事实上，加速度的连续性一定程度上决定了行驶速度的连续性和视觉的连续性。车辆加速度的大小反应了其运行速度变化的快慢，同时直接影响着驾驶员和乘客的心生理舒适性感受，速度大小又影响着驾驶员的视野和视距。运用加速度评价公路线形连续性将更直接有效。 论文在总结国内外相关研究的基础上，以加速度为媒介，分析人-车-路-环境系统中影响加速度的因素，提出汽车行驶安全性（包含汽车动力性和制动性）、驾驶员心生理舒适性（包含轴向加速度舒适性、竖向加速度舒适性、横向加速度舒适性、横向加速度变化率舒适性）、基于绿色驾驶的环保性（包含燃油消耗与尾气排放）指标评价公路线形设计连续性，研究加速度与各评价指标的关系阈值，基于层次分析法，确定众多评价指标的权重系数。结合公路运行速度预测模型、车辆行驶特性和物理学相关理论，建立加速度与公路线形指标的关系，预测车辆行驶过程中的轴向加速度、竖向加速度、横向加速度和横向加速度变化率，得出沿线加速度预测模型。通过提出基于加速度的公路线形连续性评价指数分级，推导各评价指标评价指数的计算方法，最终提出基于加速度的公路线形连续性评价方法，为公路设计阶段的安全性评价提供依据，减少因公路线形设计不连续而引发的交通安全问题。
[Abstract]:Highway alignment should be safe, fast, economical and comfortable, which requires good design continuity. Linear continuity includes the continuity of driving speed, visual continuity and acceleration. The evaluation of highway alignment continuity is based on the running speed, and the highway alignment continuity is evaluated by the speed difference of the vehicles in the adjacent sections of the highway. In fact, the continuity of acceleration determines the continuity of speed and visual continuity to some extent. The acceleration of the vehicle reflects the speed of the change of the running speed, at the same time, it directly affects the heart physiological comfort of the driver and the passenger, and the speed of the vehicle also affects the visual field and the visual distance of the driver. Using acceleration to evaluate the continuity of highway alignment will be more direct and effective. On the basis of summarizing the relevant research at home and abroad and taking acceleration as the medium, the paper analyzes the factors that affect acceleration in the human-vehicle-road-environment system. The vehicle driving safety (including vehicle power and braking), the driver's physiological comfort (including axial acceleration comfort, vertical acceleration comfort, lateral acceleration comfort), and the driver heart physiological comfort (including axial acceleration comfort, vertical acceleration comfort and lateral acceleration comfort) are proposed. Based on the environmental protection index of green driving (including fuel consumption and exhaust emission), the continuity of highway alignment design is evaluated, and the threshold of relationship between acceleration and each evaluation index is studied, based on the analytic hierarchy process (AHP). Determine the weight coefficient of many evaluation indexes. Combined with highway speed prediction model, vehicle driving characteristics and physics theory, the relationship between acceleration and highway alignment index is established to predict the axial acceleration and vertical acceleration in the course of vehicle driving. The lateral acceleration and the lateral acceleration change rate are obtained, and the prediction model of the acceleration along the line is obtained. Through the classification of highway alignment continuity evaluation index based on acceleration, the calculation method of evaluation index of each evaluation index is deduced. Finally, the highway alignment continuity evaluation method based on acceleration is put forward. It can provide the basis for the safety evaluation of highway design stage and reduce the traffic safety problems caused by the discontinuity of road route design.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U412.3
本文编号：2271867
[Abstract]:Highway alignment should be safe, fast, economical and comfortable, which requires good design continuity. Linear continuity includes the continuity of driving speed, visual continuity and acceleration. The evaluation of highway alignment continuity is based on the running speed, and the highway alignment continuity is evaluated by the speed difference of the vehicles in the adjacent sections of the highway. In fact, the continuity of acceleration determines the continuity of speed and visual continuity to some extent. The acceleration of the vehicle reflects the speed of the change of the running speed, at the same time, it directly affects the heart physiological comfort of the driver and the passenger, and the speed of the vehicle also affects the visual field and the visual distance of the driver. Using acceleration to evaluate the continuity of highway alignment will be more direct and effective. On the basis of summarizing the relevant research at home and abroad and taking acceleration as the medium, the paper analyzes the factors that affect acceleration in the human-vehicle-road-environment system. The vehicle driving safety (including vehicle power and braking), the driver's physiological comfort (including axial acceleration comfort, vertical acceleration comfort, lateral acceleration comfort), and the driver heart physiological comfort (including axial acceleration comfort, vertical acceleration comfort and lateral acceleration comfort) are proposed. Based on the environmental protection index of green driving (including fuel consumption and exhaust emission), the continuity of highway alignment design is evaluated, and the threshold of relationship between acceleration and each evaluation index is studied, based on the analytic hierarchy process (AHP). Determine the weight coefficient of many evaluation indexes. Combined with highway speed prediction model, vehicle driving characteristics and physics theory, the relationship between acceleration and highway alignment index is established to predict the axial acceleration and vertical acceleration in the course of vehicle driving. The lateral acceleration and the lateral acceleration change rate are obtained, and the prediction model of the acceleration along the line is obtained. Through the classification of highway alignment continuity evaluation index based on acceleration, the calculation method of evaluation index of each evaluation index is deduced. Finally, the highway alignment continuity evaluation method based on acceleration is put forward. It can provide the basis for the safety evaluation of highway design stage and reduce the traffic safety problems caused by the discontinuity of road route design.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U412.3
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本文编号：2271867
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