基于站点综合开发的区域综合客运枢纽设计方法研究

[交通会议论文数据库] 黎冬平 晏克非

摘要:随着轨道交通的建设和常规公交的发展,以对外交通功能为主的公路客运枢纽逐步转变为交通方式转换多样化和复杂化的区域综合客运枢纽,同时城市空间的发展使得周边用地开发日趋成熟,枢纽用地拓展困难.为协调好土地利用与多方式客运枢纽发展之间的关系,将站点综合开发理念与区域综合客运枢纽的设计相结合,在分析客流特征影响的基础上,研究基于站点综合开发的区域客运枢纽设计的指导原则、设计流程、设计内容和设计要点.通过在长沙市大河西综合客运枢纽规划设计中的应用,实现了公路、轨道、公交、出租等多交通方式与土地开发利用的一体化配置,在满足交通功能的同时,将很好地带动周边地区的改造更新,为区域综合客运枢纽的规划设计提供了很好的范例.

基于广域动态数据的城市道路交叉口高峰流量特征研究——以上海为例

[交通会议论文数据库] 钱良辉 陈小鸿

摘要:高峰流量特征对交通规划、设计、管理都具有重要意义.现有研究较少考虑了空间上的差异性.以上海市中心城49个近3年来数据质量高于70％的连续流量观测点为样本,分别以交叉口和进口道为单位,统计了早高峰流量总体特征,并利用线性回归建立了高峰小时系数、高峰时段流量比同年平均日交通量、所处区位、道路类型等因素的回归模型.结果表明,近3年来上海市中心城早高峰流量特征总体稳定；高峰流量特征的点间差异显著,且以进口道为单位和以交叉口为单位时影响因素不一致.

A Pneumatic Cylinder Driving Polyhedron Mobile Mechanism

[交通会议论文数据库] ING Wan YAO Yan-An

摘要:　　A novel pneumatic cylinder driving polyhedron mobile mechanism is proposed in this paper.The mechanism is comprised of 5 Tetrahedrons which includes a pneumatic cylinder in each edge.It locomotes by rolling and its rolling principle is that the center of mass (CM) of the mechanism moves out of the supporting area and makes it tip over through the controlling of the motion sequence of these cylinders.Firstly, the mathematical model is built to analysis the relation between the configuration and the CM of the mechanism.Then, a binary control strategy is developed to simplify and improve the control of this mobile mechanism.After that, dynamic simulation is performed to testify the analytical validity and feasibility of the rolling gaits.At last, a prototype is fabricated to roll successfully by the proposed conception.

Numerical Simulation of Microstructure Evolution during Directional Solidification Process in DS Turbine Blades

[交通会议论文数据库] Hang ZHANG

摘要:　　Directional solidified (DS) turbine blades are widely used in advanced gas turbine engine.The size and orientation of columnar grains have great influence on the high temperature property and performance of the turbine blade.Numerical simulation of the directional solidification process is an effective way to investigate the grain's growth and morphology, and hence to optimize the process.In this paper, a mathematical model was presented to study the directional solidified microstructures at different withdrawal rates.By using a Modified Cellular Automation (MCA) method and a simple linear interpolation method, the mushy zone and the microstrueture evolution were studied in detail.Experimental validations were carded out at different withdrawal rates.It is indicated that the withdrawal rate affects the temperature distribution and growth rate of the grain directly, which determines the final size and morphology of the columnar grain.A moderate withdrawal rate can lead to high quality DS turbine blades for industrial application.

A Perimeter Control Strategy for Oversaturated Network Preventing Queue Spillback

[交通会议论文数据库] Yishun Li Jianmin Xu Lvou Shen

摘要:　　A perimeter signal control strategy is investigated for a congested network.First, an algorithm is proposed to determine the proportion of traffic should be held outside during peak periods at each entry link, which is achieved by properly allocating green time for those movements.The optimization goal of this network control strategy is maximizing capacity utilization of the network, also preventing queue spillback.Lane-group-based method is used to model the traffic dynamics along arterials.Furthermore, the phase sequence and offset are optimized using an imbedded Genetic Algorithm.The signal timing outputs of this strategy are then implemented in TRANSYT-7F, and the results are compared with the outputs optimized through the TRANSYT-7F itself optimization process, which shows that the proposed strategy presents better performance, and more efficient for congested networks.The perimeter control strategy could be implemented for oversaturated networks to relieve the excessive congestion problems, particularly for those metropolitans in China.

中国“十二五”期间城镇群发展对交通发展的影响分析

[交通会议论文数据库] 董治 王艳丽 李林波 吴兵

摘要:城镇群发展是城镇化发展的必然趋势,城市群的发展要有交通的发展为支撑.结合中国城镇化发展和“十一五”期交通发展状况,对“十二五”期中国城镇群交通运输环境进行了探讨,重点分析了“十二五”期城镇群交通需求特征和“十二五”期客、货运交通系统需求,并对群际交通发展也做了相应的分析.为中国“十二五”期城镇群交通系统的建设和发展具有较强的指导意义.

Study on the design method for high-speed train nose shape under multi-line cases6

[交通会议论文数据库] ZHAO HuaiRui Li Qiang Li XiaoFan

摘要:　　Different railway line cases with different object functions will result in different or completely adverse optimal nose shape.In this paper, a method for high-speed nose shape design was proposed to provide a suitable nose shape under multi-line cases.The method with emphasis on reduction of computational costs combines mentamodel and numerical optimization techniques.An exemplary nose shapes under open air and passing tunnel line cases were designed by this technique.The comparison between the current CRH2 and those optimal nose shapes demonstrated the capabilities of the method.

沪宁通道多方式客运设施规划方案配置分析

[交通会议论文数据库] 张建旭 晏克非

摘要:沪宁通道内将有高速铁路、城际铁路、公路等多种客运交通承我方式,各种交通线路的规划方案分别由不同的主管部门和编制单位完成,各规划成果与综合交通系统的要求难免存在一定的差异.为找出这种差异,促进沪宁通道综合交通体系的可持续发展,论文首先评估了沪宁通道的现状供需矛盾,然后从客运交通需求预测、客运供需平衡分析、交通线路规划方案优化、交通线路竞争与协调关系等角度对规划方案进行分析,发现规划方案能很好地满足通道的客运出行需求,但就交通线路经营定位、设施利用、线路布局等还存在一定不足之处.最后,针对所发现问题提出了几点建议,以促进沪宁通道多方式客运交通的平衡发展.

A Modification of Local Path Marginal Coston the Dynamic Traffic Network

[交通会议论文数据库] Huang Zhengfeng Ren Gang Cheng Yang Lu Lili

摘要:　　Path marginal cost (PMC) is the change in total travel cost for flow on the network that arises when time-dependent path flow changes by one unit.Because it is hard to obtain the marginal cost on all the links, the local PMC, considering marginal cost of partial links, is normally calculated to approximate the global PMC.When analyzing the marginal cost at a congested diverge intersection,a jump-point phenomenon may occur.It manifests as a likelihood that a vehicle may unsteadily lift up (down) in the cumulative flow curve of the downstream links.Previously, the jump-point caused delay was ignored when calculating the local PMC.This article proposes an analytical method to solve this delay which can contribute to obtaining a more accurate local PMC.Next to that, use a simple case to calculate the previously local PMC and the modified one.The test shows a large gap between them, which means that this delay should not be omitted in the local PMC calculation.

河南省交通运输与经济发展的相关性和协调性定量分析

[交通会议论文数据库] 余沛 郭菁

摘要:本文运用相关矩阵和灰色综合关联度等工具,时河南省交通运输与国民经济发展之间的相关性进行了量化分析,结果表明河南省交通运输与经济发展之间相关性极高；对于交通运输与经济发展的协调性,本文运用多维灰色动态协调模型,进行数学建模分析,同时通过计算运输弹性系数进行量化分析.通过以上多种量化工具分析得出结论,河南省的交通运输虽然有了较快的发展,但总体上仍不能适应经济发展的需求.本文针对河南省交通运输存在的问题提出了相关建议.