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ID:38530879
大小:26.52 KB
页数:4页
时间:2019-06-14
《高分机械 research proposal》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、ResearchProposalEarlyinferenceonreliabilityofautomotivecomponentsbyusingpastdataandtechnicalinformation1Background1.1SignificanceWhenanewproductistheresultofdesignorprocessimprovementsintroducedinitspredecessors,thenthepastfailuredataandtheexperttechnicalkno
2、wledgeconstituteavaluablesourceofinformationthatcanleadtoamoreaccuratereliabilityestimateoftheupgradedproduct.ThisproposalintroducesaBayesianproceduretoformalizethepriorinformationavailableaboutthefailureprobabilityofanupgradedautomotivecomponent.Theelicitat
3、ionprocessmakesuseofthefailuredataofthepastproduct,thedesignerinformationontheeffectivenessofplanneddesign/processmodifications,informationonactualworkingconditionsoftheupgradedcomponentand,foroutsourcedcomponents,technicalknowledgeontheeffectofpossiblecostr
4、eductions.Byusingtheproposedprocedure,moreaccurateestimatesofthefailureprobabilitycanarise.Thenumberoffaileditemsinafuturepopulationofvehiclesisalsopredictedtomeasuretheeffectofapossibleextensionofthewarrantyperiod.Finally,theproposedprocedurewasappliedtoaca
5、sestudyanditsfeasibilityinsupportingreliabilityestimationisillustrated.Theautomotivemanufacturersperformreliabilityanalysesontheirnewproductsinordertoverifytheattainmentofagivenreliabilitytargetataspecifiedperiodt0(e.g.,thewarrantyperiodorthefulllife).Thisai
6、msbothtosatisfytheexpectationsoftheircustomersandtocontroltherepair/substitutioncostsduringthewarrantyperiod.Ifthetargetisnotachieved,thentheproductreliabilityhastobetimelyimprovedbyidentifyingthemainfailuremodesandintroducingdesignand/orprocessmodifications
7、capabletoremovethem.Mainreliabilityevaluationsaregenerallyperformedatfourspecificmilestones,whichoccurduringthedevelopmentandafterthecommercializationofanewcarmodel.Inparticular:I.Atthebeginningoftheproductdevelopmentprocess(PDP)tovalidatethechoicesmadeforpr
8、oductandprocessdesign:theoutcomeisthefinaldesignrelease.Themaininferentialprobleminsuchaphaseisthelackofexperimentalreliabilitydataaboutthenewcomponents.II.DuringthelastphaseofPDP,whenthefinalex
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