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发表于 2007-6-5 17:15:28
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AcceleratedTestingUsingHALT
WhyAcceleratedTesting?
•Theenvironmentsaremeanttogivehighlevelsofstresstoprecipitatefailuresinlesstimethaninstandardtesting.
•Oncethefailureshavebeendetected,correctivedecisionscanbemade.
•Thisprocessaddstoproductrobustness.
•Testtimeiscompressedleadingtoearlierproductmaturity.
•Acceleratedtestingisusedtoquicklydetectanyinherentdesignandmanufacturingflaws.
SomeoftheManyBenefitsofAcceleratedTesting
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•Fastdesignandprocessmaturation
•Greatlyreducedmanufacturingscreeningcosts
•Fastercorrectiveactionfordesignproblems
•Reducedproductioncosts
•Earlierandmatureproductintroduction
•HigherMTBF
•Reducedwarrantycosts
•HappyCustomers
WhatisHALT?
•HighlyAcceleratedLifeTesting
•Thisistheprocessbywhichaproductistested,usuallyinitsdesignorprototypestage,usingtemperature,vibration,andthecombinationofenvironmentstotestuntilthepointoffailure
WhatCanHaltDo?
TheAcceleratedLifeTestcanshowyou,ofteninamatterofhours,howaparticularproductwillstanduptoyearsofoperationallife.
How?.Youcansubmityourproducttoextremesofenvironmentalstress.Eachtypeofstressidentifiesspecificdefectsthatmaybemissedbytraditionaltestingmethodsandequipment
Why?
•Whenthesedefectsarespeedilyidentifiedintheproductdevelopmentstage,ithelpstoreducedevelopmenttimeandproduceshigherqualityproduct.
•Shorterdevelopmenttimemeansshortertimetomarket,somethingthatcanmakeahugedifferenceinsales.
•Higherreliabilityduringtheoperationallifespanreduceswarrantycostsandgeneralin-the-fieldrepaircosts.
•Italsobringsaboutcustomersatisfaction,somethingthat’sinvaluableinatougheconomicclimate.
Goal?
•Reliabilityisakeyfactorforproductdurabilityandforcompetitivenessintheglobalmarketplace.
•Boththeuserandthemanufacturergainfromhigherreliability.
•Theuserhasaproductthatdoeswhatitissupposedtowhenitissupposedtowithoutfailure.
•Themanufacturerhasloweredproductioncostsandfewerproductreturns.
•Everyonewins!
WhatisReliability?
•Thebestquantitativemeasureoftheintegrityofadesignedpart,component,productorsystem
•Theprobabilitythatparts,components,products,orsystemswillperformtheirdesigned-forfunctionswithoutfailureinspecifiedenvironmentsfordesiredperiodsdatagivenconfidencelevel
•Theoreticalandpracticaltools
–DimitriKececioglu,ReliabilityEngineeringHandbook |
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