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外文翻译--关于自动化立体仓库使用双货叉的探讨.doc

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外文翻译--关于自动化立体仓库使用双货叉的探讨.doc

第1页翻译部分英文原文ANANALYSISOFDUALSHUTTLEAUTOMATEDSTORAGE/RETRIEVALSYSTEMSANANALYSISOFDUALSHUTTLEAUTOMATEDSTORAGE/RETRIEVALSYSTEMSADHINARAYANKESERLABRETTAPETERSABSTRACTTHISPAPERADDRESSESTHETHROUGHPUTIMPROVEMENTPOSSIBLEWITHTHEUSEOFADUALSHUTTLEAUTOMATEDSTORAGEANDRETRIEVALSYSTEMWITHTHEUSEOFSUCHASYSTEM,TRAVELBETWEENTIMEINADUALCOMMANDCYCLEISVIRTUALLYELIMINATEDRESULTINGINALARGETHROUGHPUTIMPROVEMENTTHEDUALSHUTTLESYSTEMISTHENEXTENDEDTOPERFORMANEQUIVALENTOFTWODUALCOMMANDSINONECYCLEINAQUADRUPLECOMMANDMODEQCAHEURISTICTHATSEQUENCESRETRIEVALSTOMINIMIZETRAVELTIMEINQCMODEISDEVELOPEDMONTECARLOSIMULATIONRESULTSAREPROVIDEDFOREVALUATINGTHEHEURISTICSPERFORMANCEANDSHOWTHATITPERFORMSWELL,ACHIEVINGLARGETHROUGHPUTIMPROVEMENTSCOMPAREDWITHTHATOFTHEDUALCOMMANDCYCLEOPERATINGUNDERTHENEARESTNEIGHBORRETRIEVALSEQUENCINGHEURISTICKEYWORDSAUTOMATEDSTORAGE/RETRIEVALSYSTEMSDESIGN;AUTOMATEDSTORAGE/RETRIEVALSYSTEMSOPERATION;MATERIALHANDLINGSYSTEMS;PERFORMANCEMODELINGANDANALYSISINTRODUCTIONAUTOMATEDSTORAGE/RETRIEVALSYSTEMSAS/RSAREWIDELYUSEDINWAREHOUSINGANDMANUFACTURINGAPPLICATIONSATYPICALUNITLOADAS/RSCONSISTSOFSTORAGERACKS,S/RMACHINES,LINKCONVEYORS,ANDINPUT/OUTPUTI/OSTATIONSANIMPORTANTSYSTEMPERFORMANCEMEASUREISTHETHROUGHPUTCAPACITYOFTHESYSTEMTHETHROUGHPUTCAPACITYFORASINGLEAISLEISTHEINVERSEOFTHEMEANTRANSACTION第2页TIME,WHICHISTHEEXPECTEDAMOUNTOFTIMEREQUIREDFORTHES/RMACHINETOSTOREAND/ORRETRIEVEAUNITLOADTHESERVICETIMEFORATRANSACTIONINCLUDESBOTHS/RMACHINETRAVELTIMEANDPICKUP/DEPOSITTIMETHISTIMETYPICALLYDEPENDSONTHECONFIGURATIONOFTHESTORAGERACKANDTHES/RMACHINESPECIFICATIONSHANETAL2IMPROVEDTHETHROUGHPUTCAPACITYOFTHEAS/RSTHROUGHSEQUENCINGRETRIEVALSINTELLIGENTLYSEQUENCINGTHERETRIEVALSCANREDUCEUNPRODUCTIVETRAVELBETWEENTIMESWHENTHES/RMACHINEISTRAVELINGEMPTYANDTHEREBYINCREASETHETHROUGHPUTTHEYDEVELOPANEXPRESSIONFORTHEMAXIMUMPOSSIBLEIMPROVEMENTINTHROUGHPUTIFTRAVELBETWEENISELIMINATEDFORANAS/RSTHATISTHROUGHPUTBOUNDANDOPERATESINDUALCOMMANDMODEINESSENCE,THISMEANSTHATIFTHES/RMACHINETRAVELSINASINGLECOMMANDPATHBUTPERFORMSBOTHSTORAGEANDARETRIEVALOPERATION,THEABOVETHROUGHPUTIMPROVEMENTCOULDBEOBTAINEDINTHISPAPER,WEANALYZEANALTERNATIVEDESIGNOFTHES/RMACHINETHATHASTWOSHUTTLESINSTEADOFONEASINAREGULARAS/RSTHENEWDESIGNELIMINATESTHETRAVELBETWEENTHESTORAGEANDRETRIEVALPOINTSANDPERFORMSBOTHSTORAGEANDRETRIEVALATTHEPOINTOFRETRIEVAL,THEREBYACHIEVINGTHEMAXIMUMTHROUGHPUTINCREASECALCULATEDBYHANETAL3THEDUALSHUTTLEAS/RSISANEWDESIGNAIMEDATIMPROVINGS/RMACHINEPERFORMANCEMOSTSTUDIESONAS/RSSYSTEMSHAVEBEENBASEDONASINGLESHUTTLEDESIGNINOURANALYSISOFTHEDUALSHUTTLEAS/RSPERFORMANCE,WEBUILDUPONTHESEPREVIOUSRESEARCHRESULTS1ALTERNATIVES/RMACHINEDESIGNATYPICALUNITLOADAS/RSHASANS/RMACHINEOPERATINGINEACHAISLEOFTHESYSTEMTHES/RMACHINEHASAMASTWHICHISSUPPORTEDATTHEFLOORANDTHECEILINGANDTRAVELSHORIZONTALLYWITHINTHEAISLECONNECTEDTOTHISMASTISASHUTTLEMECHANISMTHATCARRIESTHEUNITLOADANDMOVESVERTICALLYUPANDDOWNTHEMASTTHESHUTTLEMECHANISMALSOTRANSFERSLOADSINANDOUTOFSTORAGELOCATIONSINTHERACKFIGURE1PROVIDESANILLUSTRATIONOFTHESINGLESHUTTLES/RMACHINEFIGURE1SINGLESHUTTLES/RMACHINEDESIGNATYPICALSINGLESHUTTLEAS/RSCANPERFORMASINGLECOMMANDCYCLEORADUALCOMMANDCYCLEASINGLECOMMANDCYCLECONSISTSOFEITHERSTORAGEORRETRIEVALFORSTORAGE,THETIMECONSISTSOFTHETIMETOPICKUPTHELOADATTHEI/OPOINT,TRAVEL第3页TOTHESTORAGEPOINT,DEPOSITTHELOADATTHATPOINT,ANDRETURNTOTHEI/OPOINTTHETIMEFORRETRIEVALISDEVELOPEDSIMILARLYADUALCOMMANDCYCLEINVOLVESBOTHSTORAGEANDRETRIEVALINTHESAMECYCLETHECYCLETIMEINVOLVESTHETIMETOPICKUPTHELOADATTHEI/OPOINT,TRAVELTOTHESTORAGELOCATION,PLACETHELOADINTHERACK,TRAVELEMPTYTOTHERETRIEVALLOCATION,RETRIEVEALOAD,RETURNTOTHEI/OPOINT,ANDDEPOSITTHELOADATTHEI/OPOINTIFWECRITICALLYANALYZETHEDUALCOMMANDCYCLEOFTHES/RMACHINESHOWNBYTHESOLIDLINEINFIGURE2,APOTENTIALOPENLOCATIONFORAFUTURESTORAGEISCREATEDWHENARETRIEVALISPERFORMEDFURTHERMORE,IFBOTHARETRIEVALANDASTORAGEAREPERFORMEDATTHESAMEPOINT,THETRAVELBETWEENTIMETBISELIMINATED,ANDTHETRAVELTIMEWILLBEEQUALTOTHESINGLECOMMANDTRAVELTIMEWITHTHEEXISTINGAS/RSDESIGN,THISMODEOFOPERATIONISNOTPOSSIBLE;THEREFORE,ANALTERNATIVETOTHES/RMACHINE,ADUALSHUTTLER/SMACHINE,ISPROPOSEDFIGURE2DUALCOMMANDTRAVELPATHSOFS/RANDR/SMACHINES2R/SMACHINEOPERATIONSCONSIDERANS/RMACHINEWITHTWOSHUTTLEMECHANISMSINSTEADOFONETHISNEWS/RMACHINECOULDNOWCARRYTWOLOADSSIMULTANEOUSLYEACHSHUTTLEMECHANISMCOULDOPERATEINDEPENDENTLYOFTHEOTHER,SOTHATINDIVIDUALLOADSCANSTILLBESTOREDANDRETRIEVEDANILLUSTRATIONOFTHEDUALSHUTTLES/RMACHINEISSHOWNINFIGURE3THISNEWS/RMACHINEWOULDOPERATEASDESCRIBEDBELOWFIGURE3DUALSHUTTLES/RMACHINEDESIGNTHES/RMACHINEPICKSUPTHEITEMTOBESTOREDFROMTHEI/OPOINT,LOADSITINTOTHEFIRSTSHUTTLE,ANDMOVESTOTHERETRIEVALLOCATIONAFTERREACHINGTHERETRIEVALLOCATION,THESECONDSHUTTLEISPOSITIONEDTOPICKUPTHEITEMTOBERETRIEVEDAFTERRETRIEVAL,THES/RMACHINEPOSITIONSTHEFIRSTSHUTTLEANDDEPOSITSTHELOADTHES/RMACHINETHENRETURNSTOTHEI/OPOINTTHEOPERATIONCANEASILYBESEENASASINGLECOMMANDOPERATIONPLUSASMALLTRAVELTIMEFORREPOSITIONINGTHES/RMACHINEBETWEENTHERETRIEVALANDSTORAGEASWELLASTHEADDITIONALPICKUPANDDEPOSITTIMEASSOCIATEDWITHTHESECONDLOADTHEREFORE,THES/RMACHINENOWOPERATESASANR/SMACHINEPERFORMINGARETRIEVALFIRSTTHENASTORAGEINADUALCOMMANDCYCLESINCETHER/SMACHINEHASTWOSHUTTLES,THEPOSITIONOFTHESHUTTLESHASAROLEINTHEOPERATIONOFTHESYSTEMWITHTWOSHUTTLES,THER/SMACHINEISABLETOPERFORMADUALCOMMANDCYCLEATONELOCATIONINTHERACKTHISOPERATIONIS第4页ACCOMPLISHEDBYFIRSTRETRIEVINGTHELOADONTOTHEEMPTYSHUTTLE,TRANSFERRINGTHESECONDSHUTTLEINTOPOSITION,ANDSTORINGTHELOADINTOTHEEMPTYLOCATIONINTHERACKHOWEVER,THECHOICEOFSHUTTLECONFIGURATIONDOESNOTIMPACTTHEANALYSISINTHISPAPERTOPERFORMTHESEOPERATIONS,THER/SMACHINEMUSTMOVETHESECONDSHUTTLEINTOPOSITIONAFTERTHEFIRSTSHUTTLEHASCOMPLETEDTHERETRIEVALDUETOTHESMALLDISTANCEINVOLVED,THER/SMACHINEWILLUSEASLOWERCREEPSPEEDFORPOSITIONING,BUTTHISTRAVELTIMEISGENERALLYSMALLFURTHERMORE,ANAMOUNTOFCREEPTIMEISUSUALLYINCLUDEDINTHEPICKUPANDDEPOSITTIMETOACCOUNTFORTHISREQUIREDPOSITIONINGASECONDDESIGNCHARACTERISTICISTHATADDITIONALCLEARANCEBEYONDTHEFIRSTANDLASTROWANDCOLUMNOFTHERACKMUSTBEPROVIDEDFOROVERTRAVELOFTHER/SMACHINETOACCOMMODATEBOTHSHUTTLEMECHANISMS3THROUGHPUTIMPROVEMENTTOESTIMATETHETHROUGHPUTIMPROVEMENTBYTHEDUALSHUTTLESYSTEMOVEREXISTINGDESIGNS,WEUSETHEEXPRESSIONSFORSINGLECOMMANDANDDUALCOMMANDCYCLETIMESDEVELOPEDBYBOZERANDWHITE1ANDTHETABULATEDVALUESFORTHENEARESTNEIGHBORHEURISTICFROMHANETAL4INDEVELOPINGTHEEXPRESSIONS,THEAUTHORSIN1AND4MADESEVERALASSUMPTIONSTHESAMEASSUMPTIONSHOLDFORTHENEWDESIGNANDINCLUDETHEFOLLOWING1THERACKISCONSIDEREDTOBEACONTINUOUSRECTANGULARPICKFACEWHERETHEI/OPOINTISLOCATEDATTHELOWERLEFTHANDCORNEROFTHERACK2THERACKLENGTHANDHEIGHT,ASWELLASTHES/RMACHINEVELOCITYINTHEHORIZONTALANDVERTICALDIRECTIONS,AREKNOWN3THES/RMACHINETRAVELSSIMULTANEOUSLYINTHEHORIZONTALANDVERTICALDIRECTIONSINCALCULATINGTHETRAVELTIME,CONSTANTVELOCITIESAREUSEDFORHORIZONTALANDVERTICALTRAVELACCELERATIONANDDECELERATIONEFFECTSAREIMPLICITLYACCOUNTEDFORINEITHERAREDUCEDTOPSPEEDORANINCREASEDPICKUPANDDEPOSITTIMEACREEPSPEEDISUSEDFORREPOSITIONINGTHEDUALSHUTTLE4PICKUPANDDEPOSITTIMESASSOCIATEDWITHLOADHANDLINGAREASSUMEDCONSTANTAND,THEREFORE,THESECOULDBEEASILYADDEDINTOTHECYCLETIMEEXPRESSIONS5THES/RMACHINEOPERATESEITHERONASINGLEORDUALCOMMANDBASIS,IE,MULTIPLESTOPSINTHEAISLEARENOTALLOWEDTHISASSUMPTIONISLATERRELAXEDFORTHENEWR/SMACHINETOPERFORMAQUADRUPLECOMMANDCYCLE

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