国外电子测量技术
國外電子測量技術
국외전자측량기술
FOREIGN ELECTRONIC MEASUREMENT TECHNOLOGY
2015年
6期
33-36
,共4页
模拟电路%故障重叠%故障诊断%马氏距离
模擬電路%故障重疊%故障診斷%馬氏距離
모의전로%고장중첩%고장진단%마씨거리
analog circuit%faults overlap%fault diagnosis%M ahalanobis distance
在实际的模拟电路中,电路故障种类很多,但是测试节点的数目是有限的,导致了不同的故障类之间可能存在重叠现象。对于故障重叠问题,采用常规的马氏距离诊断方法,误诊率会很高。阐述了误诊对后期电路改善的严重后果,说明通过降低故障分辨率提高故障诊断正确率是有意义的,提出在进行故障判定时不仅仅考虑最优值还要考虑最优与次优的优劣程度,结合马氏距离故障诊断方法距离进行具体说明,最后对具体电路进行分析,验证了本文的有效性。
在實際的模擬電路中,電路故障種類很多,但是測試節點的數目是有限的,導緻瞭不同的故障類之間可能存在重疊現象。對于故障重疊問題,採用常規的馬氏距離診斷方法,誤診率會很高。闡述瞭誤診對後期電路改善的嚴重後果,說明通過降低故障分辨率提高故障診斷正確率是有意義的,提齣在進行故障判定時不僅僅攷慮最優值還要攷慮最優與次優的優劣程度,結閤馬氏距離故障診斷方法距離進行具體說明,最後對具體電路進行分析,驗證瞭本文的有效性。
재실제적모의전로중,전로고장충류흔다,단시측시절점적수목시유한적,도치료불동적고장류지간가능존재중첩현상。대우고장중첩문제,채용상규적마씨거리진단방법,오진솔회흔고。천술료오진대후기전로개선적엄중후과,설명통과강저고장분변솔제고고장진단정학솔시유의의적,제출재진행고장판정시불부부고필최우치환요고필최우여차우적우렬정도,결합마씨거리고장진단방법거리진행구체설명,최후대구체전로진행분석,험증료본문적유효성。
There are many kinds of faults in the actual analog circuits .And the limited number of test nodes results in a possible overlap betw een the different fault classes .For the fault overlap ,the usage of conventional diagnostic methods based on Mahalanobis distance makes the high misdiagnosis rate .This paper describes the serious consequences of misdi‐agnosis for late circuit improvement ,and it is significant to enhance the accuracy of fault diagnosis by reducing the faults resolution .It is proposed that not only the optimal value but also the degree of optimization and inferior between the opti‐mal and suboptimal .The fault diagnosis based on Mahalanobis distance is combined to explain it concretely .Finally ,the analysis of the specific circuit is done to verify the validity of the method in this article .