接驳轨道枢纽的混合式灵活公交服务优化研究

为解决居民在轨道与小区间的出行难题,本文提出一种新型的混合式灵活公交接驳服务模式,构建了在轨道交通枢纽的客流吸引范围内灵活与固定接驳公交的协同运行机制. 在已知灵活乘客需求和车队规模的条件下,综合兼顾出行者与运营者的时间成本,以及同步考虑轨道线路和固定接驳公交线路发车计划,建立了混合式接驳公交系统线路和乘客接运计划优化模型,并采用基于重力模型的遗传算法进行求解,最后通过实例验证该模型的有效性和实用性.结果表明,该优化模型在能够有效减小车辆行驶距离和乘客出行时间的同时,提高了混合式接驳公交系统的乘客服务量,相比于单一的灵活型接驳公交系统目标结果更优.     

城市轨道交通列车自动控制系统闭塞制式的分析

城市轨道交通信号系统制式在国内外逐步呈现多样化和标准化的趋势,其制式按照闭塞方式分,有固定式、准移动式与移动式等.重点从城市轨道交通信号系统闭塞制式控制原理、技术经济特点等方面对3种闭塞方式进行对比和分析.     

客运营销调度指挥系统的实现

呼和浩特铁路局客运公司成立后,为合理地对客运公司的人力、车辆和财力资源进行优化组合,用计算机技术开发了铁路客运营销调度指挥系统,介绍了该系统的工作流程,技术难点及其具体实现.     

基于GPS与惯性测量单元的列车组合定位系统

采用GPS接收机及惯性测量单元构成列车组合定位系统,系统包括传感器输入层、故障检测与隔离层、数据融合层和输出层4个部分。给出GPS接收机、惯性测量单元等定位传感器的位置解算方法;设计采用H∞鲁棒滤波方法的数据融合算法;采用小波变换方法进行组合系统故障检测,确定故障隔离及系统重构策略。对列车组合定位系统进行现场测试和仿真验证结果表明:在复杂的列车运行环境及干扰条件下,该系统能够实现高精度高可靠性的列车定位;定位误差较采用传统的Kalman滤波方法更为稳定;组合系统能够有效实现故障检测并根据故障隔离策略重构系统,保证定位输出的连续性,保障系统安全;具有较高的适应性和实际应用价值。     

基于ITOC的船舶管系生产进度控制系统研究(英文)

Manufacturing of ship piping systems is one of the major production activities in shipbuilding. The schedule of pipe production has an important impact on the master schedule of shipbuilding. In this research, the ITOC concept was introduced to solve the scheduling problems of a piping factory, and an intelligent scheduling system was developed. The system, in which a product model, an operation model, a factory model, and a knowledge database of piping production were integrated, automated the planning process and production scheduling. Details of the above points were discussed. Moreover, an application of the system in a piping factory, which achieved a higher level of performance as measured by tardiness, lead time, and inventory, was demonstrated.     

基于WEBGIS的管道调度运行管理系统

利用GIS空间分析功能并结合计算机对整个成品油管道运行过程的主要参数、管道信息、分输站运行状况进行动态监测、实时调度和自动化控制,实现自动化信息管理。并以WEBGIS为基础,建立管道调度运行管理系统,将管道的运行状态实时地提供给管理者,对各分输站点进行自动控制,并根据经济、技术指标和实际情况,进行优化控制反馈,可以协助管道管理者对成品油管道进行安全高效的运营管理。     

Algorithms for Assembly-Type Flowshop Scheduling Problem

An assembly-type flowshop scheduling problem with minimizing makespan is considered in this paper. The problem of scheduling for minimizing makespan is first addressed, and then a new heuristic algorithm is proposed for it.     

Automated real-time railway traffic control: an experimental analysis of reliability,resilience and robustness

Railway transportation provides sustainable, fast and safe transport. Its attractiveness is linked to a broad concept of service reliability: the capability to adhere to a timetable in the presence of delays perturbing traffic. To counter these phenomena, real-time rescheduling can be used, changing train orders and times, according to rules of thumb, or mathematical optimization models, minimizing delays or maximizing punctuality. In the literature, different indices of robustness, reliability and resilience are defined for railway traffic. We review and evaluate these indices applied to railway traffic control, comparing optimal rescheduling approaches such as Open Loop and Closed Loop control, to a typical First-Come-First-Served dispatching rule, and following the timetable (no-action). This experimental analysis clarifies the benefits of automated traffic control for infrastructure managers, railway operators and passengers. The timetable order, normally used in assessing a-priori reliability, systematically overestimates unreliability of operations that can be reduced by real-time control.     

Timetable optimization models and methods for minimizing passenger waiting time at public transit terminals

This paper focuses on developing mathematical optimization models for the train timetabling problem with respect to dynamic travel demand and capacity constraints. The train scheduling models presented in this paper aim to minimize passenger waiting times at public transit terminals. Linear and non-linear formulations of the problem are presented. The non-linear formulation is then improved through introducing service frequency variables. Heuristic rules are suggested and embedded in the improved non-linear formulation to reduce the computational time effort needed to find the upper bound. The effectiveness of the proposed train timetabling models is illustrated through the application to an underground urban rail line in the city of Tehran. The results demonstrate the effectiveness of the proposed demand-oriented train timetabling models, in terms of decreasing passenger waiting times. Compared to the baseline and regular timetables, total waiting time is reduced by 6.36% and 10.55% respectively, through the proposed mathematical optimization models.