基于FTA的接触网系统可靠性研究

随着电气化铁道高速化的发展,接触网的可靠性成为铁路安全运行的一个重要因素,但它的研究只停留 在定性分析上,没有深入的定量计算。本文采用故障树演绎分析(FTA)方法,对铁路接触网系统的可靠性进行 分析和研究。以所不希望发生的故障事件作为分析的目标,找到了接触网系统存在的故障原因和机理,在大 量调研的基础上,建立了接触网系统的故障树及它的数学模型,基于Fussell下行法及最小割集法对它的可靠 性进行了定性和定量的分析。分析结果表明,腐蚀、零件的强度、磨损、疲劳、外部动态负载、强电流、污染、接触 线的张力和沿导线传播的波动速度等是造成接触网失效的主要原因,并且根据故障模式和最薄弱的环节通过 最小割集计算出了顶事件的可靠度,为接触网系统的可靠性与安全性分析和失效预测提供了一种实用的方法 和理论依据。

RESEARCH ON RELIABILITY OF THE CATENARY SYSTEM BASED ON FTA

Catenary reliability is an important factor in railway safety with high speed development of electrification railway, but its research is only qualitative analysis and not further quantitative calculation. Catenary reliability was analyzed and researched by Fault Tree deduction analysis method in this paper. The fault reason and mechanism of catenary system were found according to analyse objective of the most unexpecting fault events . The fault tree of catenary and its mathematic model was established based on a great deal of survey ,the qualitative and quantitative reliability analysis were put up based on the method of fussell down row and minimal cut sets. Analysis result shows that erosion, part intensity, wear, fatigue, dynamic load, strong current, pollution, strain , tension and wavy speed of contact wire are primary factors that bring about invalidation. At the same time, reliability of top events is calculated by minimal cut sets according to fault pattern and the most weak tache. It provides a feasible method and theoretical basis for reliability and security analysis and invalidation forecast.