Comparison of ReliabilityAvailabili.docx

Comparison of ReliabilityAvailabili.docx

《Comparison of ReliabilityAvailabili.docx》由会员分享，可在线阅读，更多相关《Comparison of ReliabilityAvailabili.docx（11页珍藏版）》请在冰豆网上搜索。

ComparisonofReliabilityAvailabili

ComparisonofReliability-AvailabilityMissionSimulators

byReidWillis

SocietyofReliabilityEngineers

ReidworksasaconsultingreliabilityengineerintheWashington,DCareaandisalong-timememberoftheWashingtonChapter.Hehassoughtoutandtestedseveralcomputerprogramsthatsupportsimulationandanalysisofthemissionreliabilityandavailabilityofcomplexsystems.Theobjectiveistofurnishusersacentralresourceforidentifyingsomecurrentlyavailablemissionsimulationtools,comparingtheircapabilities,andlocatingtheirvendors.

Thisreportreflectsdevelopmentssincetheprevious（September1999）comparison.Twonewsimulatorshavebeenaddedandthepreviousdescriptionsupdatedwithnewinformation.

Reid’ssubjectisamovingtarget;thereportisbelievedtobecurrentasofJune2000butcomputersoftwareisarapidlyevolvingindustry.Theopinionsexpressedarethoseoftheauthor,whoreservestherighttotellyoutomorrowthatwhathetoldyoutodaywaswrong.Practitionerswhohaveexperienceusingtheprograms,andvendorswhoknowsomethingthatwasmissed,areinvitedtocontacthimatreidwillis@withyourcommentsandcorrections.

ComparisonofReliability-AvailabilitySimulators

Anumberofsoftwaretoolshaverecentlybecomeavailableforusebyreliabilityengineers.Likeanyotherengineeringsupportsoftware,amissionreliabilitysimulatorcanbeexpensiveandwillprobablyrequireasignificantinvestmentinlearninghowtouseitwithconfidence.Theobjectiveofthiscomparisonistogivereliabilityengineersaquickwaytoidentifythosetoolsthatmightmeettheircurrentandfuturerequirements,andfindthevendors.Asseen,somealsoofferusefulfeaturessuchasdatacommonalitywithotherreliabilitysoftware.

SoftwareSelection

.Ninesimulationcomputerprogramswereevaluatedagainstasetofcommonrequirementsformissionsimulationandreliability-availabilityanalysis.Overall,thesimulatorsofferawidevarietyofbasicfunctionsandspecialfeatures.Thesimulatorsandtheirsourcesare:

∙AvSim+,ItemSoftware,Inc.,2030MainStreet,Suite1130,Irvine,CA92614

∙BlockSim,ReliaSoftCorporation,115S.SherwoodVillageDrive,Suite103,Tucson,AZ85710

∙ComputerAidedReliabilityEngineering（CARE）VRBD,BQRReliabilityEngineering,Ltd.,7BialikStreet,P.O.Box208,RizhonLezion,75101,Israel

∙MeasuresofDependability（MEADEP）,SoHaRInc.,8421WilshireBlvd,Suite201,BeverlyHills,CA90211

∙RAMCommander,AdvancedLogisticDevelopments,16ThomasDrive,Rome,NY43440

∙RapidAvailabilityPrototypingforTestingOperationalReadiness（RAPTOR）,Cybermesa

∙RelexRBD,RelexSoftwareCorporation,540PellisRoad,Greensburg,PA15601

∙SPAR,ClockworkDesigns,Inc.,3432GreystoneDrive,Suite202,Austin,TX78731

∙TIGER,NavalSeaSystemsCommand（code03L5）,Arlington,VA22202.

ComparisonswerebasedonpracticaltestsofAvSim+version7.02,BlockSim1.0,CAREVRBD2.2.0.0,MEADEP1.8,RAMCommander6.11,RAPTOR4.0s,RelexRBD6.0,andSPAR3.1.2;andonstudyofuserdocumentationprovidedforAvSim,BlockSim,CARE,MEADEP,RAMCommander,Relex,andSPAR.TIGERevaluationwasbasedonbetatestingofversion10.

Thecommercialvendorsorgovernmentsponsorswereconsultedtoresolveanyquestionsandtesttheirdegreeofusersupport.

Criteria

Afterreviewofseveralreliability-availabilityandlogisticsanalysesthathavebeenconductedfortheArmy,Navy,MarinesandCoastGuardinsupportofship,vehicleandaircraftdevelopmentandimprovementprograms,ten（admittedlyarbitrary）simulationcapabilitiesweredefinedthatusersmightneedinmissionsimulationstosupportreliability-maintainabilityanalyses:

Complexmodels:

Representlargesystems,downtotheequipmentitemlevel,includingcomplexdesignredundancies.

Multi-phasemission:

Simulatesystemoperationoveratimelineofchangingsuccessrequirements,equipmentoperatingconditions,andrepairconstraints.

Sparesinventoriesandrestock:

Representsparepartsconsumption,routinelocalsparesstockreplenishment,andurgentordersforsparesnotonhand.

Statisticaloptions:

Asaminimum,offerachoiceofExponentialorWeibulldistributionforequipmentfailureandExponentialorLognormalforrepair.

Datasharing:

Participateinadatainterchangeofsystemconfiguration,equipmentcharacteristics,andpartslistsaccessibletosupportotherreliabilityandmaintainabilitystudies.

Operationalavailability:

Calculatesystemmissionavailabilityunderlogisticconstraints.

Reliability:

Calculatesystemreliabilityatendofmission.

Criticalequipment:

Rankequipmentorotherelementalcomponentsbyresponsibilityforsystemdowntime（unavailability）andmissionfailures（unreliability）.

Graphics:

Provideagraphicuserinterfaceformodelpreparation,