冬季巴士海峡偏北大风的分析与预报

本文通过冬季巴士海峡偏北大风个例的计算分析，认为大气的不稳定、狭管效应对该海区偏北大风的形成起重要作用。并在此基础上，提出了适用于船舶的预报此类大风的方法。     

基于PFV策略的连续型元胞自动机交通流模型

科学合理的微观交通流仿真模型是研究交通控制手段有效性的关键.本文结合一种考虑驾驶员视野内前后多车影响的跟驰策略，建立了连续型元胞自动机交通流模型.仿真实验表明，仿真数据与实测数据有较好的拟合性，仿真得到的 K-Q、K-V和 Q-V图能较好地反映实际道路交通流的失稳现象，所建立的模型具有适应不同场景的兼容性与灵活性，能够作为研究我国实际道路交通流问题的仿真工具.     

地铁车站大客流组织措施研究

针对地铁车站大客流组织问题，以天津地铁营口道站为具体研究对象，结合实际运营经验，对大客流组织原则、影响因素和应对措施进行较全面的探讨。首先，结合营口道站实际运营情况和一线工作经验，总结地铁车站的大客流组织原则；其次，从乘客乘坐地铁的流程入手，详细分析影响车站大客流组织的主要影响因素，定量化计算AFC系统服务能力、出入口及通道的通过能力、楼扶梯的通过能力、站台乘候车秩序？、列车运能和客流疏导能力等；最后，遵循大客流组织原则，针对影响大客流组织的主要因素，从客流预测、客流组织、行车调度和票务组织等方面提出具体的大客流组织应对措施。     

不同雷诺数下车辆队列尾车发动机舱盖气动特性研究

数值仿真与模型风洞试验相结合研究了典型工况下两车队列中尾车发动机舱盖气动特性和两车间隔区域的流场,对比了缩比模型和实车模型对应雷诺数下车辆队列的流动形态。缩比模型仿真结果与风洞试验结果一致表明采用数值方法的可行。对比不同雷诺数下车辆队列气动特性发现,缩比模型与实车模型发动机舱盖表面平均静压分布基本相同,但在纵向对称面上,实车模型的前车尾迹比缩比模型更加上扬,底部区域气流速度更高。非定常条件下,实车模型前车尾涡相对尺度明显小于缩比模型,且扩散得更充分,尾迹区涡的分布状态更加混沌,发动机舱盖表面脉动能量的分布更加混乱。涡在两车间隔区域的运动并非简单的移动,而是一个由涡破裂、涡配对和涡融合构成的复杂过程。     

旅游城市高铁站站前广场综合交通改善设计——以黄山北站为例

在全国高铁网络逐步构成的背景下,旅游城市高铁站站前广场在高铁运营后逐渐显现出了设施配套不足、交通组织混乱等问题.以黄山北站为例,通过分析黄山北站客流特征、站前广场交通设施现状、交通组织及运行,对黄山北站客流进行了预测,对交通设施规模进行了测算.根据预测结果,提出了交通改善策略,并从设施布局、交通组织等方面提出了近期和远期的具体交通改善方案.     

基于DD6119K60客车流水槽优化设计

对近年来国内客车流水槽的结构、材料及造型方面存在的问题进行了分析，并给出了具体的设计方案。     

洞新高速公路岩溶路基处理工程实例

在分析总结国内外相关研究成果的基础上,基于洞新高速公路现场施工处治经验,开展现场变形预测分析,总结提出适用的溶洞路基施工处治技术,并采用有限元计算与理论分析相结合的方法,对加固效果进行分析。     

A theoretical foundation for the relationship between generalized origin–destination matrix and flow matrix based on ordinal graph trajectories

This paper shows the relationship between flow, generalized origin–destination (OD), and alternative route flow from a set of ordinal graph trajectories. In contrast to traffic assignment methods that employ OD matrix to produce flow matrix, we use ordinal trajectory on a network graph as input and produce both the generalized OD matrix and the flow matrix, with the alternative and substitute route flow matrices as additional outputs. By using linear algebra‐like operations on matrix sets, the relationship between network utilization (in terms of flow, generalized OD, alternative route flow, and desire line) and network structure (in terms of distance matrix and adjacency matrix) are derived. Copyright © 2012 John Wiley & Sons, Ltd.     

Performance comparison between pedestrian push-button and pre-timed pedestrian crossings at midblock: a Korean case study

Walking has been highlighted as an independent transportation mode as well as an access/egress mode to/from public transit to encourage the use of more sustainable transport systems. However, walking does not seem to have priority over other transportation modes, especially in areas where various modes of movement are in conflict. The pedestrian push-button system seems to be a solution to distribute the right of way. The focus of this study is on the performance issue of the pedestrian push-button. Specifically, this study deals with issues related to mid-block crossings and attempts to answer two questions: whose waiting time is longer at pre-timed and push-button crossings, pedestrians, or vehicles? and which system – pre-timed or push-button – is better in terms of total waiting time? According to our simulation analyses, if the pedestrian flow rate is less than 120, 85, and 70 ped/h for two-, three-, and four-lane roads, respectively, the push-button system is recommended.     

某VAN客车空调各出风口出风量分析及优化

以某VAN客车顶置空调风道实体模型为分析对象,模拟了空调风道内部气流分布,分析了空调风道各出风口的风量分配。通过对客调出风口结构的优化,使空调风道各出风口的体积流量趋于均匀,各出风口体积流量标准差、空调风道压力损失有所降低,各项指标得到明显改善,优化效果显著。