基于危害度相对比值的故障样本分配方案

Relative Criticality Ratio Based on Failure Samples Allocation

针对机电产品测试性验证评估试验中,基于故障率的按比例分层抽样分配传统方法忽略了关键因素产品故障模式危害度,导致试验结果不精确这一问题,结合故障模式严酷度评分等级,改进了产品危害度分析模型,首次提出基于危害度相对比值的故障样本分配方案。通过在导弹飞控组件的二次电源系统中进行测试性验证评估试验,结果表明:该方案与基于故障率的按比例分成抽样分配方法相比,故障样本分配结果更加合理,测试性验证评估结果更加接近系统测试性设计的真实水平,其更具有工程实用性。

In the testability demonstration and evaluation test of mechanical and＂ electrical products, the traditional proportionate stratified sampling allocation based on failure rate ignores product failure model criticality, and that makes test result imprecise. To solve this problem, the product criticality analysis model was mended combining with the grade of failure mode severe and a plan of failure sample allocation was firstly put forward based on relative criticality ratio. Finally, a testability demonstration and evaluation test had been done on the secondary electrical power source system of some missile＇s fly control module. The test result showed, comparing with the traditional proportionate stratified sampling allocation based on failure rate, that the failure samples allocation based on the proposed plan in this article was more rational and the result of demonstration test was much more approximate to the real level of product testability design,and it was more practical in project.