减小计轴主机宕机故障影响的优化方案

正常情况下,计轴设备故障不会对CBTC模式下的列车运行产生影响,但当计轴设备故障发生在特定情境下时,会造成故障区域道岔无法转换,列车进路无法排列,列车无法以CBTC模式或点式ATP模式运行,对运营服务造成严重影响。通过深入研究、分析该特定情境与计轴宕机的关系,并结合现有系统的实际情况,提出一种可有效减小计轴CPU板宕机故障影响的优化方案。     

铁路车站人数统计系统的设计与实现

首先分析车站出入口人数统计系统的设计需求,然后对系统相关软硬件的选取和实际环境的搭建进行介绍,并描述如何利用人头检测增强人数统计的准确性,最后介绍系统的总体框架、运行流程以及各子模块的功能,并给出部分实验结果。     

用于疲劳可靠性分析的公路桥梁荷载效应研究

根据超载车辆分布较多的府店路荷栽调查资料,开展了一般运行状态和密集运行状态下的疲劳荷载谱模拟计算研究.通过公路桥梁荷载效应分析,得到了一般运行状态和密集运行状态下的应力时程曲线,利用雨流计数法建立公路桥梁应力幅谱△σ-n<,i>.根据线性累积损伤原则,推导出公路桥梁疲劳可靠性分析的等效应力幅△σ<,e>的计算公式,定义...     

MCU控制起动保护继电器原理设计和应用

采用单片机控制的保护继电器可以同时采集发电机D＋、转速信号、空档信号、内部起动计时等多路信号,通过内部程序比对计算,同时输出两路信号分别控制起动机的电源线圈和励磁线圈。相对于传统数字电路保护模块,信号采集保护更全面、及时,两路外部输出可以有效减少继电器自身故障引起的因触点脱不开而烧坏起动机的故障,比传统保护继电器更加可靠。     

西门子AzS(M)350M型微机计轴设备系统

介绍西门子AzS(M)350 M型微机计轴设备与传统的轨道电路相比在完成铁路区段空闲、占用检查功能方面的优势和这种系统的构成、工作原理及具体运用。     

提高微电子交流计数设备稳定性的措施

本文通过对微电子交流计数自动闭塞设备故障发生率较高的问题进行了分析，提出对问题的解决方案。     

人工计数法应用于城市区域性路网交通量统计

介绍了运用人工计数方法来统计区域性路网的交通量大小,对重庆市两路口区域路网进行了交通量统计和数据处理;并通过数据进行分析,掌握了两路口区域的交通流量特点。实践证明该方法具有可操作性。     

降雨对高速公路行车安全的影响及对策

雨天交通事故在高速公路事故中占有很大的比例。文章主要分析降雨形成路面水膜、降雨量对水膜厚度的影响以及水膜对轮胎与路面接触的影响。通过分析降雨对高速公路行车影响提出相应对策,提高行车的安全性。     

Fatigue life prediction based on the rainflow cycle counting method for the end beam of a freight car bogie

This paper presents a system for treating of the actual measured data for load histories. The approach consists of two steps: stress analysis and fatigue damage prediction. Finite element analysis is conducted for the component in question to obtain detailed stress-strain responses. A significant number of failures occurred in a brake end beam which led to economic losses and disruption of service. The cracks appeared to be fatigue cracks caused by the dynamic load produced in the loaded bogie frame. Strain gauge data were analyzed, and fatigue cycles were calculated from this data. Rainflow cycle counting was used to estimate cumulative damage of the end beam under in-service loading conditions. The fatigue life calculated with the rainflow cycle counting method, the P-S-N curve, and the modified Miner’s rule agreed well with actual fatigue life within an error range of 2.7%~31%.     

A study on seepage field in subgrade slope subjected to various rainfall patternsEI北大核心

Research purposes: Rainfall is one of the most important factors for subgrade slope failure, and rainfall patter is one of the most primary influence parameters. Based on the two-dimensional saturated-unsaturated seepage theory, numerical analyses are conducted to investigate the change rules of seepage field in subgrade slope subjected to rainfalls with four different patterns, i.e. delayed, uniform, central and advanced rainfall patterns. Research conclusions: (1) Both the maximum pore-water pressure umax and the maximum saturated depth Hsmax at shoulder are affected by rainfall intensity and rainfall duration observably. (2) There is a sensitive range of coefficient of permeability influencing on the maximum saturated depth, only within the sensitive range increasing coefficient of permeability could reduce Hsmax and subgrade surface pore-water pressure effectively. (3) Under central and advanced rainfall patterns, the most dangerous time stage of slope stability is obvious affected by coefficient of permeability, within the sensitive range and the less side outside the sensitive range, the starting point of the most dangerous time stage is not affected by coefficient of permeability, but the end time is advanced with coefficient of permeability increasing. (4) The stability of subgrade slope is the best under advanced rainfall pattern and the worst under delayed rainfall pattern. (5) The research results can provide basis and reference for slope protection and reinforcement design.