错位交叉口信号控制优化研究

从错位交叉口自身特点及其对交通流的影响方面讨论了错位交叉口2个T形口距离与信号控制方式的关系,确定了控制方式选择的T形口距离阈值,并从信号控制相位优化和配时优化方面重点介绍了将错位交叉口作为一个大型交叉口进行综合控制的信号优化方法.     

系数变号的二阶非线性常微分方程的正周期解

讨论了其中a(t)可以变号的二阶常微分方程u"(t) a(t)u(t)=f(t,u(t)),t∈R的周期解的存在性问题,利用krasnoselskii锥映射的不动点定理,获得了ω-正周期解的存在性与多重性结果.     

服务于路网诱导的可变信息板研究

可变信息板(VMS)是进行路网诱导的有效方式,而国内在这方面的研究和应用还处于起步阶段。以工程实际为出发点,首先采用模糊聚类法进行诱导路网的选择研究;然后考虑驾驶员对VMS的反应,研究VMS的选型;再结合现有规范,从施工与认知性的角度,提出VMS版面设计中应该遵循的原则,并给出示例;最后考虑驾驶过程中驾驶员的认知性特点,采用State Prefer- ence方法的研究结论,提出了VMS的设置原则。研究结果及相关建议,对VMS在路网诱导中的应用具有重要的借鉴作用。     

行为引导教学法在机电教学中的应用

随着我国经济的发展,国家对于应用型人才的渴望逐渐加大.因此,在教育改革中重点强调素质教育改革,伴随着新课改的教育改革要求,学生已经成为教育目标的主体,要求教师改革教育手段,在教学过程中,提高学生的主体地位,使学生充分发挥自身的主观能动性,提高学习能力.这就要求教师需要从根本上改变教学手段,引导教学法能够实现素质教育的要...     

Driver response to variable message signs: a stated preference investigation

This paper uses a Stated Preference approach to undertake a detailed assessment of the effect on drivers’ route choice of information provided by variable message signs (VMS). Although drivers’ response to VMS information will vary according to the availability of alternative routes and the extent to which they are close substitutes, our findings show that route choice can be strongly influenced by the provision of information about traffic conditions ahead. This has important implications for the use of VMS systems as part of comprehensive traffic management and control systems. The principal findings are that the impact of VMS information depends on: the content of the message, such as the cause of delay and its extent; local circumstances, such as relative journey times in normal conditions; and drivers’ characteristics, such as their age, sex and previous network knowledge. The impact of qualitative indicators, visible queues and delays were examined. It was found that not only is delay time more highly valued than normal travel time, which is to be expected, but that drivers become more sensitive to delay time as delay times increased across the range presented.     

基于强化学习的城轨信息发布策略研究

通过信息发布影响乘客选择行为进而改变路网客流分布，是从需求侧缓解拥堵问题的重要手段之一.本文提出基于强化学习的城市轨道交通信息发布策略生成方法，根据路网各区间客流满载率提取系统状态，再根据系统状态在学习器生成由各OD推荐路径组成的信息发布动作，对乘客进行信息发布；通过发布信息后路网系统状态变化，评估获得实施信息发布动作的奖励值.依托城市轨道交通客流分布动态仿真系统，使用 Q- learning 算法进行训练，获得最优信息发布策略.以实际路网为例进行算例验证，通过对比有无信息发布情景得到，在有信息发布情景下路网客流拥堵情况得到了较大缓解.     

厦漳跨海大桥北汊主桥抗震性能研究

厦漳跨海大桥北汊主桥是主跨780 m的连续钢箱梁双塔斜拉桥,场地地震基本烈度高达Ⅶ度,其抗震设计非常复杂,且无规范可循,为此开展专门研究.以JTG/T B02-01-2008《公路桥梁抗震设计细则》为指导,从抗震设防标准、地震动输入、动力有限元建模、抗震性能评价、抗震构造措施检查等方面,对厦漳跨海大桥北汊主桥抗震性能研究进行介绍,为类似桥梁抗震设计提供参考.     

Traffic guidance–perimeter control coupled method for the congestion in a macro network

Macroscopic fundamental diagram (MFD) describes the macro relationship between a network vehicle density and a network space mean flow, without requiring the mastery of complex origin to destination data. Thus, MFD provides an opportunity for the macro control of urban road network. However, most of the existing MFD control methods ignore the active role of traffic guidance in solving congestion problems. This study presents a traffic guidance–perimeter control coupled (TGPCC) method to improve the performance of macroscopic traffic networks. The method considers the optimal cumulative volume of a network as the goal and establishes a programming function according to the network equilibrium rule of traffic flow amongst multiple MFD sub-regions, which regards the minimum delay of network, as the objective. The Logit model for the compliance rate of driver route guidance is established by the stated preference survey. Moreover, the perimeter control (PC) method is proposed for adjusting the phase split of intersections. Finally, three schemes, namely, the TGPCC, PC and the method without PC and guidance are tested on a network with four well-defined MFD sub-regions. Results show that the TGPCC addresses the issue of congestion and decreases the total delay accordingly.     

乘客导向信息服务系统设计理念——以北京市客运枢纽为例

北京市建成并投入使用的客运枢纽在乘客导向信息服务系统标准化、精细化设计方面普遍存在不足,枢纽内外部引导信息衔接不畅,乘客信息需求与供给不匹配。基于此,针对北京南站、北京西站等9座客运枢纽开展标志调查,总结枢纽在乘客引导方面普遍存在缺乏衔接、盲目追求距离最短、缺乏统一规划等问题。进而提出乘客导向信息服务系统设计可参考的理念与方法,包括各类服务信息分级引导、设计综合信息标志、规范使用名称、优先设置客运标志而非广告等。     

飞行器迎面拦截导引仿真

以航母编队防空作战推演为背景,基于仿真方法对其中的航空器迎面拦截问题进行了分析研究。针对目标运动态势,限于非军事因素,要求任务单元能够在目标正前方威慑距离外与目标面对面对峙,从而达到威慑拦截效果,旨在迫使对方后退,最大限度避免火力接触,这一点与导弹击毁式拦截不同。迎面拦截分为两个部分,首先在与目标同方向运动过程中,向目标对称靠近,然后再沿圆弧路径飞行更改航向,达到与目标面对面对峙。论文设计了拦截算法,并通过仿真验证了算法的有效性。