Delay Restoration of Single-Track Railway Rescheduling

On the basis of analysis of the principle of delay restoration in a disturbed schedule, a heuristic algorithm for rescheduling trains is developed by restoring the total delay of the disturbed schedule. A discrete event topologic model is derived from the original undisturbed train diagram and a back propagation analysis method is used to label the maximum buffer time of each point in the model. In order to analyze the principle of delay restoration, the concept of critical delay is developed from the labeled maximum buffer time. The critical delay is the critical point of successful delay restoration. All the disturbed trains are classified into the strong-delayed trains and the weak-delayed trains by the criterion of the critical delay. Only the latter, in which actual delay is less than its critical delay, can be adjusted to a normal running state during time horizon considered. The heuristic algorithm is used to restore all the disturbed trains according to their critical details. The cores of the algorithm are the iterative repair technique and two repair methods for the two kinds of trains. The algorithm searches iteratively the space of possible conflicts caused by disturbed trains using an earfiest-delay-first heuristics and always attempts to repair the earliest constraint violation. The algorithm adjusts the weak-delayed trains directly back to the normal running state using the buffer time of the original train diagram. For the strong-delayed trains,the algorithm uses an utility function with some weighted attributes to determine the dynamic priority of the trains, and resolves the conflict according to the calculated dynamic priority. In the end, the experimental results show that the algorithm produces ＂good enough＂ schedules effectively and efficiently in disturbed situations.     

浅谈机舱通风的生产设计思路

本文通过3型船舶上的机舱通风所采取的不同设计方案的研究，归纳性的提出了在艉机舱中、小型船舶中“八点供风”的概念，并由此提出的“八点供风” “机舱防死角系统”及“基于八点供风的定点送风系统”两种设计方案。通过在实船的运用证明，3个设计方案均是行之有效的 。     

燃油溢流系统设计探讨

对船舶燃油溢流系统的组成和任务作简要介绍，并对燃油贮油舱的压力产生原因及防止油舱过压采取措施进行分析，同时以带流量计和溢流阀的两种燃溢流系统为例，对它们进行布置设计和压力计算。     

关于对SS3B电力机车制动风机控制电路增设延时控制的建议

针对SS3B型电力机车电阻带经常烧损的故障现象，分析其产生的原因，提出了改进制动风机控制电路的措施，使问题得到了彻底解决。     

V停反行区段供电线上网方案的探讨

鉴于朔黄线电气化铁路变电所距分相绝缘器距离较远及V停反行技术条件的现状，文章对V停反行技术要求与绝缘段关节，分相绝缘器位置及“八”字渡线间关系进行了分析，通过对2种供电线上网方案的探讨，确定了供电线上网的最佳方案，节省了投资。     

电气集中电路动态故障处理分析

在6502电气集中设备的维护中，经常遇到电路动态故障。随着继电器的动作，故障点隐藏，无法像处理静态故障那样用电压、电流法根据电路的动作层次找出故障点。尤其是信号开放后又关闭的故障，通过观察继电器的动作顺序很难判断，造成长时间故障延时。下面是处理这方面故障的一点体会。     

SS4、SS6机车快速启动预备保护控制环节存在的问题及对策

分析SS4、SS6电力机车低级位延时电路,讨论劈相机自动开关跳断、司机控制器联锁不良时保护环节上的缺陷,提出改进措施,防止因不通风造成平波电抗器等部件烧损故障的发生.     

DC600V供电客车电源批量投入应用

在空调旅客列车编组中,基于集中供电、分散变流的列车供电系统正逐步取代空调发电车的作用,成为空调列车新型供电方式的主要发展方向。DC600V供电客车电源是这种列车供电系统的核心,它具备高效率、低噪声、无污染、免维护、独立性强和编组灵活的特点。由株洲时代集团自主开发的DC600V供电客车电源项目2000年底通过由湖南省科委组织的省级鉴定,产品先后在北京-武汉区间客车、“新曙光”内燃动车组和“中原之星”动车组上成功运用。在此基础上,2003年底成功完成了36台新造客车(25G,120km/h)用DC600V供电客车电源的任务,产品性能进一步完善…