IMT-A面向宽带移动通信网络传输性能的分布式测量方法

提出了一种针对IMT-A面向宽带移动通信网络传输性能的分布式测量方法,该方法可以有效的反映用户在移动网络中的延时问题,并且减弱了操作系统与应用平台之间的非可控性因素的影响。接着,分析了目前宽带无线通信系统测试中,结果无法准确反映网络传输的实际情况的原因。     

SS_3型机车接地继电器恢复线圈同时烧损的原因及改进

针对SS3 型机车9个接地继电器上的恢复线圈惯性烧损的故障现象，从电路原理和乘务员操作两方面分析其原因，提出相应防止措施及改进方案。     

6502电气集中室内网络线故障的处理

由于车流密度逐渐增大，现场能提供给信号值班人员的应急处理时间越来越有限。对于断线故障，过去需花费较长时间翻阅图纸，延时长，直接影响运输效率。根据多年教学及生产实际经验，总结了简便的处理方法即1／2法，不用“跑”大电路图，只需翻阅某一组合电路图，节省分析及测试时间，缩短了处理故障延时。现将该方法介绍如下。     

前照灯电子控制装置种种

为了提高汽车在夜间行驶的速度,确保行车安全,不少汽车上采用了前照灯电子控制装置。常用的前照灯电子控制装置有:前照灯自动变光器、前照灯状态自动调整系统、昏暗自动发光控制系统、前照灯关闭自动延时控制装置。前照灯自动变光器是一种根据对方车辆灯光的亮度自动变远光为近     

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.     

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。     

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.     

CAN总线网络传输的延时优化研究

为减小CAN总线网络延时对传输速率的影响,提出了一种报文偏移量补偿与标识符优化的混合优化方案.首先定义总线网络传输延时,研究了表征CAN总线网络数据传输延时的主要指标,然后设计了报文分段与编码方案优化方法和延时报文的偏移量补偿方法,最后采用二者相结合的方案改善延时情况,并利用Symtavision软件分别对优化前、后C...     

声相关计程仪过程分析存在的问题探讨

提出目前声相关计程仪原理分析过程中存在的问题，及其正确的分析方法，从而使其工作原理的分析过程清晰明了。