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.     

9110TCL车辆运输半挂汽车的结构设计

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SAU在铁通骨干智能网中的重要作用

SAU在铁通智能网中起着重要的作用。主要介绍了SAU信令接入方式及其协议转换的工作原理。     

钢轨减振接头夹板

一、短轨线路接头病害应当及早解决 在全国7万多公里的营业铁路中仍有约5万多公里是短轨区段(每公里有40对接头)。就是在长轨区段中,在道岔前后,长轨缓冲区,无碴桥线路等处仍保留有钢轨接头。由于这些钢轨接头的存在,使机车、车辆的车轮在通过钢轨接头时,就产生强大的冲击力。速度越     

任选测站技术原理及其在高速公路测量中的应用

探讨公路测量任选测站中的坐标变换原理与方法，介绍获取测站参数的计算公式，分析任选测站进行公路测量的点位误差，说明任选测站技术在高速公路测量中的应用效果。     

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现代商用汽车驾驶室以其大面积前风窗玻璃而形成良好的视野,但与此同时由于不顾一切地采取保护性的玻璃封装措施,让大量的阳光射入了驾驶室。刺目的阳光,加上高度紧张的驾驶操作,在炎热季节里的驾驶室简直就