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.
Field Failure Rate Estimate from HALT Results
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下载，学习，谢谢！
其中excel档有吗？或者提供一下计算公式更好
大家都好厲害~~
我是來學習的。
学习一下
多谢楼主！
学习一下
coffee1217,理论很强.
[url]http://www.opsalacarte.com/Pages/reliability/reliability_prot_halt_calculator.htm[/url]
[url]http://www.opsalacarte.com/pdfs/Tech_Papers/Field_Failure_Rate_Estimate_from_HALT_Results.pdf[/url]
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
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谢谢LZ分享！:handshake:handshake:handshake