铁路综合客流与列流管理系统的研究与实现

本文介绍了铁路综合客流与列流管理系统关键技术和主要功能,基于区段密度和区段客座率理论的算法准确高效是该系统的主要创新,同时在系统实现策略上采用了基于DevExpress组件的数据可视化技术和轻量级桌面GIS技术,达到了数据可视化效果与程序交互性的良好平衡,符合客运业务人员的使用习惯和分析思路.     

Traffic flow consideration in design of freight distribution system

This study is part of a series of research projects on a distribution system we developed to deal with cases in a state-owned company. It concerns the design of the Public Service Obligation State-owned Company (PSO-SOC) distribution system. The intrinsic features of PSO-SOC are distributing strategic commodities and having subsidies within the cost function. Hence their distribution flow has to be secured under consideration of moving the commodities within road networks that have traffic flow dependency. This paper focuses on the solution of the proposed model which represents traffic flow dependency within a freight distribution network.The mathematical formulation takes the form of a Minimum Cost Multicommodity Flow (MCMF) problem. Traffic flow dependency is incorporated into the model by introducing a coefficient of speed, which is derived from the traffic assignment of ordinary traffic associated with the transportation of the type of freight under consideration The solution of the proposed model is formulated by Network Representation (NR), in which all of the components of the mathematical model are represented in the form of dummy links and nodes added to the original (physical) network. It is to be noted then, that the traffic flow on each road or link is represented by a link performance function (LPF), depicting traffic flow dependent travel time and consequent cost. The MCMF problem of NR is further solved by a Primal-Dual Algorithm.Finally, an illustrative example is exercised to show how the proposed step-wise solution works.     

城市轨道交通线网规划时考虑的几个问题

对城市轨道交通线网规划进行了研究,重点分析了几个对线网规划总体效果影响比较大的因素：城市轨道交通客流规模预测的分析;城市轨道交通线网规模的确定;城市轨道交通换乘结点的设置与合理分布。总结了如何合理有效地完善城市轨道交通线网并以此来发挥城市轨道交通大量、快速、公交化的优势,缓解和改善城市的交通压力。     

液力变矩器研究综述

论述了液力变矩器现代设计分析理论的主要特点和发展过程,对研究成果较多的流场试验研究和仿真研究,以及关键设计参数进行了分析.对试验研究的主要设备和数据处理方法、数值仿真研究影响较大的标准k-ε模型和混合面技术进行了阐述,并在充分考虑了以前研究成果和作者实践的基础上讨论了液力变矩器的未来研究方向.     

基于概率统计模型的公交停靠站车流特征分析

公交停靠站是城市公共交通系统的重要组成部分,公交停靠站不仅关系到公共交通运输的质量和效率,而且影响公共交通的运行质量和城市环境。本文采用人工计数法对哈尔滨市东大直街公交停靠站的公交车到达时间、服务时间、机动车流量进行统计,运用数理统计法整理调查数据,采用概率统计模型拟合了公交车辆到达和服务时间的分布特性,给出了分布拟合函数。     

Investigation of the shear flows over a sunroof opening based on a linear inviscid instability analysis

The large-scale shear flows over the sunroof opening of a mid-sized SUV measured using a PIV system were investigated. The shear flows were measured for five different cases of deflector protrusion (one case was the baseline test without deflector) at two different free stream flow velocities below the critical velocity where the buffeting noise level reached a maximum. The structures of the shear flows were observed to differ, apparently depending on whether the radiated buffeting noise is relatively strong or not. For strongly buffeting experimental cases, the momentum thicknesses of the shear layers were observed to grow rapidly and saturated at a station near the downstream edge of the sunroof opening, where the saturation of the transverse velocity fluctuations was also observed, and where the vortex coalescence process was presumably completed. On the other hand, no discrete large-scale vortex structures were observed for none-buffeting or weakly buffeting cases. Streamwise growth of the velocity fluctuations was found to be well predicted by a linear hydrodynamic instability analysis for the strongly buffeting cases. Numerical results obtained from a linear inviscid instability analysis using a hyperbolic tangent mean velocity profile were used to calculate the amplification factors with the initial momentum thickness and the streamwise fluctuation wavenumber. The shear flows were found to form large-scale discrete vortices when the linear inviscid amplification factors exceeded a threshold amplification factor.     

自流装车管路系统的工艺计算

根据自流装车管路系统中鹤管流量不同的工艺特点,建立了自流装车管路系统水力计算和装车时间计算的严格模型,讨论了自流装车管路系统水力计算的数值求解方法和基本思路,应用弦截法求解管路系统水力计算方程,求出在一定液位上集油管、鹤管段的流量。采用龙贝格数值积分法求解装车时间,应用VC 6．0高级语言编制了自流装车管路系统计算程序,应用该程序可快速进行工艺设计计算和模拟计算。计算表明：操作的鹤管数越多,各鹤管的流量差别就越大。     

基于Perti网的业务流系统的语义描述

尝试利用Perti网理论对包括航运业务流程在内的以信息传递为主的业务流系统的语义描述进行了系统的探讨。内容主要包括：业务流系统特点分析、业务流的基本Perti网语义描述、业务流的基本流程关系描述、冲突消解及业务能力有限的Perti网实现、业务流程的组合分解与抽象细化的Perti网实现、不同性质的任务标识与激发的Perti网语义描述、业务流属性的Perti网语义描述等。     

水平管路气液两相段塞流电导探针信号分析

利用自制电导探针采集了气水两相管路中段塞流的液位数据，并对数据进行了统计学分析。实验中发现，环状探针的测量数据要优于双平行探针的测量数据，而探针信号与压力信号一样，可以反映两相流动流型的统计特征，为电导探针的应用做了实验验证，并为流型的识别提供了依据。     

文丘里型末端变风量阀弹簧设计探讨

文章提出了当量直径概念,根据量纲分析理论对绕圆球充动的绕流阻力公式进行了修改,从而得出文丘里型末端变风量瘩中阀芯绕流阻力与其所处位置的关系,在理论上提出了设计主等节距弹簧的方案,这对建立数学模型进行数值计算有着启发性的意义。