aerodynamic loads and wake flow features of low aspectratio triangular prisms at different wind dir.docx
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aerodynamic loads and wake flow features of low aspectratio triangular prisms at different wind dir.docx
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aerodynamicloadsandwakeflowfeaturesoflowaspectratiotriangularprismsatdifferentwinddir
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Previousstudieshaveshownadaptivecruisecontrol(ACC)cancompromisedrivingsafetywhendriversdonotunderstandhowtheACCfunctions,suggestingthatdriversneedtobeinformedaboutthecapabilitiesofthistechnology.Thisstudyappliesecologicalinterfacedesign(EID)tocreateavisualrepresentationofACCbehavior,whichisintendedtopromoteappropriaterelianceandsupporteffectivetransitionsbetweenmanualandACCcontrol.TheEIDdisplayrevealsthebehaviorofACCintermsoftimeheadway(THW),timetocollision(TTC),andrangerate.ThisgraphicalrepresentationusesemergentfeaturesthatsignalthestateoftheACC.Twofailuremodes—exceedanceofbrakingalgorithmlimitsandsensorfailures—wereintroducedinthedrivingcontextsoftrafficandrain,respectively.Amedium-fidelitydrivingsimulatorwasusedtoevaluatetheeffectofautomation(manual,ACCcontrol),anddisplay(EID,nodisplay)onACCreliance,brakeresponse,anddriverinterventionstrategies.DriversintrafficconditionsreliedmoreappropriatelyonACCwhentheEIDdisplaywaspresentthanwhenitwasnot,proactivelydisengagingtheACC.TheEIDdisplaypromotedfasterandmoreconsistentbrakingresponseswhenbrakingalgorithmlimitswereexceeded,resultinginsafefollowingdistancesandnocollisions.Inmanualcontrol,theEIDdisplayaidedTHWmaintenanceinbothrainandtrafficconditions,reducingthedemandsofdrivingandpromotingmoreconsistentandlessvariablecar-followingperformance.Theseresultssuggestthatprovidingdriverswithcontinuousinformationaboutthestateoftheautomationisapromisingalternativetothemorecommonapproachofprovidingimminentcrashwarningswhenitfails.Informingdriversmaybemoreeffectivethanwarningdrivers.
ArticleOutline
1.Introduction
1.1.EIDforadaptivecruisecontrol
1.2.Purpose
2.Method
2.1.Participants
2.2.Apparatus
2.3.Drivingenvironmentoverview
2.4.Drivingtask
2.5.Adaptivecruisecontrol
2.6.Experimentaldesign
2.7.Procedure
2.8.Dependentvariables
3.Resultsanddiscussion
3.1.Automationreliance
3.2.Driverintervention
3.2.1.Clusteranalysisofinterventionstrategies
3.3.BenefitsofEIDinmanualcontrol
3.4.Secondarytaskperformance
3.5.Limitations
4.Conclusion
Acknowledgements
References
densityofnon-sphericalparticlesasderivedfromcombinedmeasurementsofaerodynamicandmobilityequivalentsize OriginalResearchArticle
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AerodynamicloadscalculationandanalysisforlargescalewindturbinebasedoncombiningBEMmodifiedtheorywithdynamicstallmodel OriginalResearchArticle
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TheaerodynamicloadsforMWscalehorizontal-axiswindturbinesarecalculatedandanalyzedintheestablishedcoordinatesystemswhichareusedtodescribethewindturbine.Inthispaper,thebladeelementmomentum(BEM)theoryisemployedandsomecorrections,suchasPrandtlandBuhlmodels,arecarriedout.BasedontheB-Lsemi-empiricaldynamicstall(DS)model,anewmodifiedDSmodelforNACA63-4xxairfoilisadopted.Then,bycombingBEMmodifiedtheorywithDSmodel,asetofcalculationmethodofaerodynamicloadsforlargescalewindturbinesisproposed,inwhichsomeinfluencefactorssuchaswindshear,tower,towerandbladevibrationareconsidered.Theresearchresultsshowthatthepresenteddynamicstallmodelisgoodenoughforengineeringpurpose;theaerodynamicloadsareinfluencedbymanyfactorssuchastowershadow,windshear,dynamicstall,towerandbladevibration,etc,withdifferentdegree;thesinglebladeenduresperiodicalchangingloadsbutthevariationsoftherotorshaftpowercausedbythetotalaerodynamictorqueinedgewisedirectionareverysmall.Thepresentedstudyapproachofaerodynamicloadscalculationandanalysisisoftheuniversity,andhelpfulforthoroughresearchofloadsreductiononlargescalewindturbines.
ArticleOutline
1.Introduction
2.Coordinatesystemsforwindturbines
3.Calculationmodelsofbladeaerodynamicloads
3.1.CorrectionsforBEMtheory
3.2.Dynamicstallmodel
3.2.1.Unsteadyattachedflow
3.2.2.Trailingedgeseparatedflow
3.2.3.Vortexinducedair-loads
3.2.4.Verificationofdynamicstallmodel
3.3.Aerodynamicloadsmodel
4.Calculationresultsanalysis
5.Conclusions
Acknowledgements
Glossary
References
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Flexibilityinmanufacturingsystems:
Arelationalandadynamicapproach OriginalResearchArticle
EuropeanJournalofOperationalResearch
Machineconfigurationselectionhasagreatimpactonthesystem-levelreliabilityofamanufacturingsystem,whiletheabsenceofproperconsiderationoftheproductqualityandthetooldegradationontoolfailurewhendeterminingthemachine-levelreliabilityislikelytoresultinunanticipatedmachinedowntimesorinappropriatemaintenancedecisions.Agenericmethodologyisthusdevelopedtoincorporateboththemachine-levelandthesystem-levelreliabilityanalyses.Firstly,themachine-levelreliabilityisinvestigatedbasedontheproductdimensionalqualityandthetooldegradation.Anovelmachine-levelqualityreliability-integratedmodelisdevelopedtoaddresstheinteractionbetweenproductqualityandtoolreliability.Thedevelopedmachine-levelreliabilitymodelisthenusedtoestimatethesystem-levelreliabilityforamanufacturingsystemwithselectedconfigurations.Varioushybridconfigurationsofthemulti-operationalmanufacturingsystemareinvestigatedintermsofthesystem-levelreliability.Theanalyticalprocedureandtheeffectivenessoftheproposedmethodologyaredemonstratedthroughanexampleofaserial-parallelhybridsystemforcylinderheadgasketmachining.
ArticleOutline
1.Introduction
2.Assumptionsandnotations
2.1.Assumptions
2.2.Notations
3.Machine-levelreliabilitymodelingandanalysis
3.1.Productqualityandtooldegradation
3.2.Qualityandreliabilityinteraction
3.3.Machine-levelreliabilitymodelingconsideringproductqualityandmanufacturingsystemcomponentdegradation
4.System-levelreliabilitymodelingandanalysis
4.1.Reliabilityofdifferentconfigurations
4.2.Reliabilitymodelingandanalysisofhybridconfiguration
5.Casestudy
6.Concludingremarks
Acknowledgements
AppendixA.Appendix
References
minimizingmeanflowtimeinFMSswithroutingflexibility:
Threshold-basedalternaterouting OriginalResearchArticle
EuropeanJournalofOperationalResearch
Predictionofaerodynamicdiameterofparticleswithroughsurfaces OriginalResearchArticle
PowderTechnology
Adjoint-basedaerodynamicshapeoptimizationonunstructuredmeshes OriginalResearchArticle
JournalofComputationalPhysics
controlstrategiesofanFMSunderdifferentscenarios OriginalResearchArticle
RoboticsandComputer-IntegratedManufacturing
Thispaperpresentsasimulationstudyaimedatevaluatingtheperformancesofaflexiblemanufacturingsystem(FMS)intermsofmakespan,averageflowtime,averagedelaytimeatlocalbuffersandaveragemachineutilization,subjecttodifferentcontrolstrategieswhichincluderoutingflexibilitiesanddispatchingrules.Theroutingstrategiesunderevaluationare‘noalternativeroutings’;‘alternativeroutingsdynamic’;and‘alternativeroutingsplanned’.Aboveroutingstrategiesarecombinedwithsevendispatchingrules,andstudiedindifferentproductionvolumewhichvariesfrom50to500parts.Inaddition,impactsofbothinfiniteandfinitelocalbuffercapacitiesareanalyzed.SinceanFMSusuallydealswithavarietyofproducts,effectsofchangingthepartmixratioarealsodiscussed.Finally,machinefailureisalsointroducedinthisresearchtostudytheeffectsofmachinereliabilityonthesystem.Simulationresultsindicatethatthe‘alternativeroutingsplanned’strategyoutperformsotherroutingstrategiesifthelocalbuffersizeisinfinity.However,thereisnoparticulardispatchingrulethatperformswellinallbuffersizesettingsbutinfinitybuffers
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