Comparison of ReliabilityAvailabili.docx
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Comparison of ReliabilityAvailabili.docx
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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,
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