客货混运铁路专线轨道振动分析

研究目的:分析客货混运铁路专线客车及货车引起轨道振动的规律。研究方法:通过建立考虑线路随机不平顺的轨道结构连续3层梁模型,论述了运用傅里叶变换法分析轨道结构振动的方法。首先对轨道结构振动方程进行傅里叶变换,求解傅里叶变换域中的振动位移,再通过快速离散傅里叶逆变换得到轨道结构的振动响应。研究结果:分析了客、货列车以不同速度运行时对轨道结构振动的影响。研究表明,在客货混运的铁路专线上,最不利的工况应是货车。在同样的列车速度条件下,货车引起的轨道位移比客车大45%~50%,货车引起的轨道加速度比客车大40%~50%,货车引起的轨道动压力比客车大50%~60%。研究结论:客货混运铁路专线比客运专线和货运专线更易损坏,建设客、货分离的铁路专线是有效的解决方法。     

基于DSP和DSP/BIOS的弓网振动信号检测与预处理实现

引入DSP技术到弓网振动检测中,提高了系统的稳定性,降低了功耗,增加了系统的实时性。同时结合DSP/BIOS嵌入式操作系统减小了系统的软件设计难度,然后给出了代码的优化方法。最后,简要分析了现场典型数据。     

济南车站无站台柱雨棚接触网悬挂安装方案比选

研究目的:为了配合济南站无站台柱雨棚改造工程,须对济南站无站台柱雨棚接触网悬挂安装方案进行比选.研究结果:根据综合研究以及济南站雨棚电化改造有关结构承载力的验算,推荐济南车站客场无站台雨棚区段接触网悬挂安装方案采用贯通式大跨度软横跨方案.     

秦沈客运专线接触网技术标准综述

对秦沈客运专线接触网悬挂类型、线材配置、导线高度及结构高度、腕臂支持结构、接触网电分相形式、接触网支柱基础等主要技术标准进行分析、总结。     

刚性接触网的不平顺分析

研究目的:刚性接触网的不平顺会激发受电弓和刚性接触网之间的有害振动,破坏受流,影响行车安全。在我国对刚性接触悬挂不平顺的研究刚刚起步,所以对刚性接触网不平顺进行分析是十分必要的。研究方法:对刚性悬挂不平顺进行数值模拟分析以及推导受电弓与接触网系统的计算模型。研究结果:推导出了刚性接触悬挂的受流性能由2个方面决定,一是受电弓的受流特性,二是刚性接触悬挂的接触面的不平顺值。研究结论:刚性接触悬挂的不平顺是研究受电弓与刚性接触网系统振动的基础,减少刚性接触悬挂的不平顺,受流质量将得到提高。     

Dynamics of railway wagons subjected to braking/traction torque

Braking or traction torque is regarded as an important source of wheelset skid and a potential source of derailment risk that adversely affects the safety levels of train operations; therefore, this research examines the effect of braking/traction torque to the longitudinal and lateral dynamics of wagons. This paper reports how train operations safety could be adversely affected due to various braking strategies. Sensitivity of wagon dynamics to braking severity is illustrated through numerical examples. The influence of wheel/rail interface friction coefficient and the effects of two types of track geometry defects on wheel unloading ratio and wagon pitch are also discussed in the paper.     

PACDIN statement of methods

PAntograph–Catenary Dynamic Interaction (PACDIN) is a code developed by the vehicle technology research centre (CITV) of the Universitat Politècnica de València in collaboration with the railway company Talgo S.L. The model of the catenary is a finite element model using absolute nodal coordinates. It is based on a general formulation that can be applied for analysing a wide range of catenary configurations, including stitch wire, transitions or non-straight path tracks. The formulation is fully non-linear and includes large deformations, dropper slackening and contact interaction. The model is linearised when deformations are small, as in the case of the benchmark dynamic analysis. The results of the PACDIN code show a good agreement with the average results of other benchmark codes.     

PantoCat statement of method

The pantograph–catenary dynamic interaction analysis program (PantoCat) addresses the need for a dynamic analysis code able to analyse models of the complete overhead energy collecting systems that include all mechanical details of the pantographs and the complete topology and structural details of the catenary. PantoCat is a code based on the finite element method, for the catenary, and multibody dynamics methods, for the pantograph, integrated via a co-simulation procedure. A contact model based on a penalty formulation is selected to represent the pantograph–catenary interaction. PantoCat enables models of catenaries with multiple sections, including their overlap, the operation of multiple pantographs and the use of any complex loading of the catenary or pantograph mechanical elements including aerodynamic effects. The models of the pantograph and catenary are fully spatial being simulated in tangential or curved tracks, with or without irregularities and perturbations. User-friendly interfaces facilitate the construction of the models while the post-processing facilities provide all quantities of interest of the system response according to the norms and industrial requirements.     

小“天窗”改造九跨式电分相施工模式探讨

既有九跨式双断口电分相因不能满足第6次铁路大提速要求而需对其进行改造.本文通过对新、旧电分相的对比及分析,提出了九跨式电分相原位置改造施工的模式,该模式不仅能克服天窗点短对施工的制约,而且能将施工对运输的影响降至最低.     

铁路集装箱中心站移动接触网感应电压计算

以国内首个铁路集装箱中心站移动接触网--昆明铁路集装箱中心站移动接触网为研究对象,提出了移动接触网上的静电和电磁感应电压的计算方法,根据昆明站的实际工况计算了移动接触网上的感应电压,可为铁路集装箱中心站移动接触网的设计、防护提供技术支持.