京九线FZy—CTC分散自律调度集中系统的研究

以京九线北京铁路局管辖区段为研究对象,通过详细分析繁忙干线、复杂线路（枢纽地区）的运输组织模式和调度指挥特点,归纳总结运输生产组织规律,探讨分散自律系统装备京九线运输组织方案,减轻调度员的劳动强度,以提高调度指挥系统的自动化、智能化水平,提高整体运输生产效率。     

中国列车运行控制系统的技术解析

高速铁路信号与控制系统的主要特点是分散自律调度集中系统.中国列车运行控制系统(CTCS)是为了保证列车安全运行,并以分级形式满足不同线路运输需求的列车运行控制系统.其目的是适应中国现有信号装备现状,实现路网之间互连互通,满足最高速度160～350 km/h的列控要求.CTCS的体系结构按铁路运输管理层、网络传输层、地面设备层和车载设备层配置.列车运行控制系统根据系统配置按功能划分为5级.分别对5级CTCS的功能及地面和车载子系统的组成进行了详细的阐述.基于通信特别是基于无线移动通信的列车自动防护系统(ATP)是今后的重要发展方向.     

枢纽中多个场的信号集中及分散控制方案

从理论上提出及分析枢纽中多个场的集中及分散控制方案,同时以实际改造工程为例详细分析对比了不同方案的优缺点。     

胶济线分散自律调度集中系统综合组网方案

主要介绍胶济线分散自律调度集中系统综合网络方案,重点描述分散自律调度集中广域网组网方案及利用GSM-R铁路专用全球移动通信系统解决分散自律调度集中系统无线通信相关问题.     

压力分散型锚索在边坡工程中的设计与应用

通过预应力锚索桩板式高挡墙的多级承载式预应力锚索结构的应用实例,介绍了压力分散型锚索的设计、计算与分析和使用效果。     

动车所调车防护系统应答器设置及控制方案研究

动车所调车防护系统为动车所内调车作业提供安全防护,其应答器设置及控制方案极其重要。针对存车线受动车存放需求、平交道位置影响,咽喉区受折返作业、差置调车信号机、道岔区段调车信号机等影响,提出不同情况下调车应答器组具体设置方案,这对规范中调车应答器设置进行了补充、明确;针对集中式和分散式调车防护系统这两种应答器控制方案,从系统差异、工程实施难度、产品可靠性、维护工作量、投资等方面进行比选,并提出两种方案的工程设计应用建议。本文的研究结论对动车所调车防护系统应答器设置及控制方案的选择具有重要的参考意义。     

Cooperative traffic control of a mixed network with two urban regions and a freeway

Currently most optimization methods for urban transport networks (i) are suited for networks with simplified dynamics that are far from real-sized networks or (ii) apply decentralized control, which is not appropriate for heterogeneously loaded networks or (iii) investigate good-quality solutions through micro-simulation models and scenario analysis, which make the problem intractable in real time. In principle, traffic management decisions for different sub-systems of a transport network (urban, freeway) are controlled by operational rules that are network specific and independent from one traffic authority to another. In this paper, the macroscopic traffic modeling and control of a large-scale mixed transportation network consisting of a freeway and an urban network is tackled. The urban network is partitioned into two regions, each one with a well-defined Macroscopic Fundamental Diagram (MFD), i.e. a unimodal and low-scatter relationship between region density and outflow. The freeway is regarded as one alternative commuting route which has one on-ramp and one off-ramp within each urban region. The urban and freeway flow dynamics are formulated with the tool of MFD and asymmetric cell transmission model, respectively. Perimeter controllers on the border of the urban regions operating to manipulate the perimeter interflow between the two regions, and controllers at the on-ramps for ramp metering are considered to control the flow distribution in the mixed network. The optimal traffic control problem is solved by a Model Predictive Control (MPC) approach in order to minimize total delay in the entire network. Several control policies with different levels of urban-freeway control coordination are introduced and tested to scrutinize the characteristics of the proposed controllers. Numerical results demonstrate how different levels of coordination improve the performance once compared with independent control for freeway and urban network. The approach presented in this paper can be extended to implement efficient real-world control strategies for large-scale mixed traffic networks.     

云计算浅析

云计算是继大型机集中计算、PC机分散计算之后,以互联网为载体的更大规模的集中计算模式。云计算具有应用便捷、按需订购、节省成本、易于扩展、高可用性等PC计算无法比拟的优点。但在上网带宽、信息保密、应用种类等问题未得到妥善解决之前,终端计算仍将存在。未来终端计算的前途将主要取决于云计算满足人机交互所需要的快速反应的程度。     

PMSM用逆变器单环矢量调制策略

分析了目前永磁同步电机（PMSM）常用控制方法的优点与不足,结合正弦波脉宽调制（SPWM）技术与转子磁场定向控制（FOC）技术,提出了一种PMSM用逆变器的单闭环空间矢量调制（SL—SVPWM）方法。以PMSM模型为基础,在Matlab仿真软件的Simulink环境下结合S函数构建了基于SL—SVPWM的PMSM伺服系统仿真模型。通过试验比较了SPWM与SL-SVPWM控制方式下绕组相电流波形,分析了SL—SVPWM驱动下电机的动态响应性能。由仿真与试验结果可见,SL-SVPWM与SPWM相比PMSM的控制性能更为优越,与FOC相比控制系统结构、算法大为简化。