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.     

单片微机在地基系数测试中的应用

介绍单片微机用于地基系数测试装置中的特点,以及该测试系统的硬、软件设计原理.     

铁路斜交桥梁的设置

随着铁路建设的发展，铁路线路的线形条件和技术指标日益提高．大部分桥位服从线路走向，进而形成了大量的铁路桥梁与道路、既有铁路、航道等呈斜交的局面，有些桥梁甚至是大角度斜交．采用中小跨度桥梁跨越时，需对桥梁墩台的布置进行处理，因此，斜交桥梁的布置显得尤为重要．本文对中小跨径铁路斜交桥梁的设置形式作了简要介绍．     

单牵引拉杆装置横向刚度对客车动力学性能的影响

介绍了单牵引拉杆装置横向刚度的测定方法和设计思路。应用35个自由度的高速客车动力学模型研究了单牵引拉杆装置横向刚度对客车动力学性能的影响。研究提出，为使客车获得良好的动力学性能要尽量减小单牵引拉杆装置的横向刚度。     

中高速列车共线运行的仿真研究

以京沪高速为背景,对中高速列车共线运行仿真问题进行探讨。分别建立单列车运行模型和多列车共线运行模型。单列车运行模型全面考虑了列车物理特性、线路条件、列车受力情况以及运行控制过程。多列车模型在上述基础上,附加了共线运行不同速度列车间的相互影响,对列车间距控制和避让进行了重点考虑,研究多列车共线运行时的列车间距控制策略和避让策略。用VisualC 6 0进行了中高速列车共线运行的软件实现。仿真计算结果表明,该软件能较好模拟多列车共线运行情况,可作为列车调度系统中负责列车运行模拟的子系统。     

微胶囊技术制备缓释型咪唑啉类缓蚀剂

咪唑啉类缓蚀剂是一种高效的杂环类缓蚀剂，但存在药效时间短、需药量大等缺点．采用微胶囊技术，制备了四种缓释型咪唑啉类缓蚀剂胶囊，并分别测定了其包覆率，表明单凝集法制备的样品的包覆率较高；同时采用红外光谱技术和紫外可见分光光度计对样品进行了测定，确定其芯材确实为眯唑啉，为进一步微囊化奠定了基础．     

首列单层内燃动车组拖车设计

介绍动车组拖车的功能设计、主要技术参数的选择、结构、性能等。