Field Failure Rate Estimate from HALT Results

coffee1217 · 发表于 2009-7-6 18:54:59

FYR
FieldFailureRateEstimatefromHALTResults
OverviewofEstimator
TheAFREstimatorisapatentpendingmathematicalmodelthat,whenprovidedwiththeappropriateHALTand
productinformation,willaccuratelyestimatetheproduct’sfieldAFRorAnnualFailureRate.Thismethodology
hasbeenusedonanumberofproductswithsignificantpositivefinancialresults.Thismodelwillalsoprovide
HASSorHASAdataforthedetectionofanoutgoingqualityprocessshiftintimefromastatedAFR.Herearea
fewreasonsforwhyandwhenthismodelshouldbeused:
•AsHALTtakesonlyafewdaystorunandtoimplementitscorrectiveaction(s),andevenifittookabit
longer,thistimewouldbefarlessthanwaitingforalifeoracceleratedlifetesttoberunandto
implementitscorrectiveaction(s).Theapplicationofthismodelcanbeahugetimeandcostsaver.
•AshigherHALTlimitsequatetolowerAFR,younowhaveatoolthatcanaccuratelyestimatethefieldAFR
beforelaunchingtheproduct.StresslevelsthataredepictedinthetableinSectionEarehighly
recommendedforHALT.Theselevelscanassuretheproducerthattheproductwillexceedcustomer
expectationsandallowtheproducertoaccuratelyforecastwarrantyexpenditures.
•BynotperforminglifetestsandsimplydoingHALT,timeandmoneywillbesaved.Thisisnottosaythat
lifetestingisn’timportant.Itshouldbeconsideredfornewtechnologiesandforanexistingpart/design
withadifferentapplicationbutnotasaprocesstoaccuratelyestimateAFR.
•WithseventotensimpledataentrypointsandmostofthemcomingfromtheHALTeffort,theAFR
EstimatorwillprovideanaccuratefieldAFRinstantaneouslywithitsassociated90%statisticalconfidence
limits.TheinputsforHASSandHASAare:willyouperformHASSorHASA,thedailysamplesize,andthe
detectableshiftintheAFRyouwishtodetect.
•TheAFREstimatorhasbeenvalidatedonovertwentyproductsfromdiversemanufacturersanddesign
environments.
•ThemodelcanaccommodateHALTsamplessizesfromonetosixwiththeoptimumsizebeingfour.
Samplesizesofgreaterthanfourwilldefaulttofour.
•90%upperandlowerconfidencelimitsarecalculatedbasedontheHALTAFRandtheHALTSampleSize.

Jack315 · 发表于 2009-7-6 19:56:31

谢谢LZ分享！

yeh · 发表于 2009-7-6 20:43:24

卖软件广告文稿吗?

coffee1217 · 发表于 2009-7-7 08:54:16

http://www.opsalacarte.com/Pages ... halt_calculator.htm

http://www.opsalacarte.com/pdfs/ ... om_HALT_Results.pdf

AFREstimator是MikeSilver于2008年ASTR上提出的公式，提出后于美国可靠度业界造成一阵讨论，
但此公式仍需各家厂商自已的统计资料才能达到一个比对的效果，并非直接性的结论产出~
大家参考参考吧~因为一直以来许多人在探讨HALT测试结果与可靠度数据(如:MTBF)的相关性~所以引起讨论是必然的

aaronguo290 · 发表于 2009-12-23 13:18:45

coffee1217,理论很强.

chjhwfj · 发表于 2009-12-28 00:33:51

学习一下

kingdodoo · 发表于 2009-12-29 15:18:12

多谢楼主！

facri001 · 发表于 2010-1-2 21:06:14

学习一下

SOPHIA.FU · 发表于 2011-6-16 15:57:48

大家都好厲害~~
我是來學習的。

ice_fang · 发表于 2011-7-22 11:52:25

其中excel档有吗？或者提供一下计算公式更好

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Field Failure Rate Estimate from HALT Results

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