基于面向对象软件的故障树技术研究

Research on fault-tree construction based on object-oriented software

故障树模型是导致系统失效的基本事件之间逻辑关系的图形表示 ,应用于系统失效模型的定性和定量分析。面向对象软件可靠性分析过程包括面向对象软件故障树构造、故障树简化及量化、依据基本事件失效概率确定系统失效 (顶部事件 )的概率等。继承性是面向对象软件的特性。文章提出了一个从类的继承关系图 (类层次图或类格 )构造面向对象软件故障树的构造算法 ,并且提出了构造多层故障树的设想。

Fault tree model is the graphical expression of connection of basic events which result in system fault, and used in qualitative and quantitative analysis of system fault model. Safety analysis includes fault tree construction,fault tree reduction, minimal cut set algorithm and top event probability computation according to basic event fault probability. Inheritance is characteristic of object oriented(O O) software, and superclass fault can result in subclass fault.This paper presents an algorithm to construct O O software fault tree from class inheritance relation graph.