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面向测试性试验的FMECA方法研究

2021-07-20孔令伟

河南科技 2021年4期

孔令伟

摘 要:测试性试验可以客观评价产品测试性水平,验证产品的测试性设计是否满足规定的要求,及时发现产品在测试性设计方面的各种缺陷,并促进测试性设计水平提升。FMECA作为测试性试验的重要基础,其详细程度决定了测试性试验能否更好地开展。然而目前FEMCA存在一些问题,不能有效满足测试性试验的需求。针对这些问题,本文从测试性试验对FMECA的需求出发,提出一种面向测试性试验的FMECA方法,并将其应用于产品的研制过程中。研究表明,该方法能够满足测试性试验的要求。

关键词:测试性试验;FMECA;故障模式;故障影响

中图分类号:V416文献标识码:A文章编号:1003-5168(2021)04-0009-04

Abstract: The testability test can objectively evaluate the testability level of the product, verify whether the testability design of the product meets the specified requirements, discover various defects in the testability design of the product in time, and promote the growth of the testability design level. FMECA is an important foundation of testability tests, and its level of detail determines whether testability tests can be carried out better, however, the current FMECA has some problems and cannot effectively meet the needs of testability tests. In response to this problem, this paper started from the testability test's demand for FMECA, proposed a testability test-oriented FMECA method, and applied it in the product development process. Research shows that this method can meet the requirements of testability tests.

Keywords: testability test;FMECA;failure mode;failure cause

测试性试验是指在研制的装备中注入一定数量的故障,用规定的测试方法进行故障检测与隔离,并根据结果来估计装备的测试性设计水平,判断是否达到规定要求[1-4]。故障注入试验是有损性甚至破坏性试验,考虑到试验风险、试验费用及试验时间,国内现有测试性试验的故障样本一般都是规定一定数量,有限的试验故障注入样本代表性差,无法保证对装备主要功能、关键故障的覆盖,影响了抽样模拟故障的随机性和遍历性,进而降低了验证结论的置信度,同时抽取的有限故障注入样本也无法实现充分暴露产品潜在故障的目的[5-7]。因此,通过分析装备本身功能/结构组成及性能特点,提出符合装备本身特点的测试性试验方案,以充分暴露产品设计缺陷、客观评价产品测试性。……

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