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Testability verification based on sequential probability ratio test method

机译：基于序贯概率比检验方法的可检验性验证

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Testability plays an important role in the readiness of equipment as a good design for testability (DFT) can greatly decrease the fault detection and isolation time, which will accelerate the maintenance actions. Testability verification is a procedure to check that whether the testability indexes such as fault detection rate (FDR) and fault isolation rate (FIR) meet the requirement in the contract. Currently, standards and statistical methods used in testability verification have the problems such as large sample, long period and so on. Sequential probability ratio test (SPRT) method can decrease the test sample size with almost a same operation characteristic as classical method based on binomial distribution. SPRT method and its truncated rules are introduced and the spectrum of expected test number is proposed. Then, the sample size allocation method and failure mode selection method based on failure rate used in sequential testability verification are illustrated. Testability verification of a control system is implemented with the given method and steps. Software named testability demonstration and evaluation system (TDES) which can calculate the decision criteria, plot decision chart, select failure mode and make judgment is used in the test as assistance. The result shows that the test sample size is remarkably decreased while comparing with the classical method.
机译：可测试性在设备准备就绪中起着重要作用，因为良好的可测试性设计（DFT）可以大大减少故障检测和隔离时间，从而加快维护工作。可测试性验证是检查诸如故障检测率（FDR）和故障隔离率（FIR）之类的可测试性指标是否满足合同要求的过程。当前，可测性验证中使用的标准和统计方法存在样本量大，周期长等问题。顺序概率比检验（SPRT）方法可以以与基于二项式分布的经典方法几乎相同的操作特性来减少测试样本的大小。介绍了SPRT方法及其截断规则，并提出了预期测试数的频谱。然后，说明了在顺序可测性验证中使用的基于故障率的样本量分配方法和故障模式选择方法。控制系统的可测试性验证是通过给定的方法和步骤实现的。在测试中，可以使用名为可测试性演示和评估系统（TDES）的软件，该软件可以计算决策标准，绘制决策图，选择故障模式并做出判断。结果表明，与传统方法相比，测试样本的大小显着减小。

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