摘要
车载ATP安全系统作为信号系统主要组成部分,对列车的安全性起着决定性作用,必须保证其具有高度的可靠性。传统上采用故障树分析方法(FTA)对车载ATP安全系统可靠性进行分析,但是在处理复杂系统时,存在着计算量大、步骤复杂等缺陷。文中在FTA方法的基础上,采用基于迭代法的BDD分析。实验数据表明,在保证计算精度的同时,能够减少分析的复杂度和计算量,并可直接计算出不同重要度,进一步对基本事件排序方法进行了优化。
As the major component of the signaling system, on-board ATP safety system plays a decisive role in the safety of train. It is essential to assure its high reliability. Traditionally, FTA is used to analyze the reliability of on-board ATP safety system. However, when the system becomes more complex, the method has such drawbacks as extensive cal- culations and complex procedures. On the basis of FTA method, BDD analysis was used based on the method of iteration. The results show that this method can reduce the complexity and computation time, while assuring the accuracy of the calculation. With the results, it can directly calculate different measures of component importance to optimize the basic ordering schemes, in order to make the size of the BDD to be smaller.
出处
《交通与计算机》
2008年第6期175-179,共5页
Computer and Communications
