考虑单元互测的测试性指标分配方法

Testability index allocation method considering unit mutual test

测试性分配是将系统级测试性指标按照一定规则分配给各组成单元的过程。针对现有主流测试性分配方法未考虑单元之间的互测情形,导致分配结果不合理,尤其是部分单元分配指标虚高,难以实现或代价过高等问题,提出了在综合考虑单元故障率、故障危害度等多重影响因素基础上,进一步考虑单元互测因素的测试性指标分配方法。首先实施考虑多重影响因素的指标初次分配;然后基于单元测试性初步设计结果,实施测试性建模与分析,得到单元自检故障率与他检故障率;再利用这两个数据以及初次分配结果构造分配函数实施再次分配,进而得到最终的分配结果;最后应用该方法进行仿真和实例运算,证明了该方法的有效性和先进性。

Testability allocation is a process of assigning system-level testability indicators to units according to certain rules. In view of the current mainstream allocation methods which donot consider mutual test among units, and then cause unreasonable allocation results, such as being difficult to achieve or costing too much, an testability index allocation method is proposed, which considers not only the conventional factors such as the unit failure rate and the failure hazard, but also the factors of the unit mutual test. Firstly, the primary allocation considering multiple factors is implemented. Secondly, based on the preliminary testability designing of units, the testability modeling and analysis are carried out to obtain the fault self-detection rate and the fault nonself-detection rate. Thirdly, the secondary allocation is implemented by using the two data and the primary allocation results to achieve the final allocation results. Finally, the method is applied to simulation and exemplifying, which proves its validity and advancement.