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英文原文APPLICATIONANDDEVELOPMENTOFCASEBASEDREASONINGINFIXTUREDESIGNABSTRACTBASEDONTHECASEBASEDDESIGNINGCBDMETHODOLOGY,THEFIXTURESIMILARITYISINTWORESPECTSTHEFUNCTIONANDTHESTRUCTUREINFORMATIONTHEN,THECOMPUTERAIDEDFIXTUREDESIGNSYSTEMISCREATEDONCASEBASEDREASONINGCBR,INWHICHTHEATTRIBUTESOFTHEMAINFEATURESOFWORKPIECEANDSTRUCTUREOFFIXTUREASCASEINDEXCODEAREDESIGNEDFORTHERETRIEVEOFTHESIMILARCASES,ANDTHESTRUCTUREANDHIERARCHICALRELATIONOFCASELIBRARYARESETUPFORSTOREMEANWHILE,THEALGORITHMBASEDONTHEKNOWLEDGEGUIDEDINTHERETRIEVEOFTHESIMILARCASES,THESTRATEGYOFCASEADAPTATIONANDCASESTORAGEINWHICHTHECASEIDENTIFCATIONNUMBERISUSEDTODISTINGUISHFROMSIMILARCASESAREPRESENTEDTHEAPPLICATIONOFTHESYSTEMINSOMEPROJECTSIMPROVESTHEDESIGNEFFICIENCYANDGETSAGOODRESULTKEYWORDSCASEBASEDREASONING;FIXTUREDESIGN;COMPUTERAIDEDDESIGNCADFIXTURESAREDEVICESTHATSERVEASTHEPURPOSEOFHOLDINGTHEWORKPIECESECURELYANDACCURATELY,ANDMAINTAININGACONSISTENTRELATIONSHIPWITHRESPECTTOTHETOOLSWHILEMACHININGBECAUSETHEFIXTURESTRUCTUREDEPENDSONTHEFEATUREOFTHEPRODUCTANDTHESTATUSOFTHEPROCESSPLANNINGINTHEENTERPRISE,ITSDESIGNISTHEBOTTLENECKDURINGMANUFACTURING,WHICHRESTRAINSTOIMPROVETHEEFFICIENCYANDLEADTIMEANDFIXTUREDESIGNISACOMPLICATEDPROCESS,BASEDONEXPERIENCETHATNEEDSCOMPREHENSIVEQUALITATIVEKNOWLEDGEABOUTANUMBEROFDESIGNISSUESINCLUDINGWORKPIECECONFIGURATION,MANUFACTURINGPROCESSESINVOLVED,ANDMACHININGENVIRONMENTTHISISALSOAVERYTIMECONSUMINGWORKWHENUSINGTRADITIONALCADTOOLSSUCHASUNIGRAPHICS,CATIAORPRO/E,WHICHAREGOODATPERFORMINGDETAILEDDESIGNTASKS,BUTPROVIDEFEWBENEFITSFORTAKINGADVANTAGEOFTHEPREVIOUSDESIGNEXPERIENCEANDRESOURCES,WHICHAREPRECISELYTHEKEYFACTORSINIMPROVINGTHEEFFICIENCYTHEMETHODOLOGYOFCASEBASEDREASONINGCBRADAPTSTHESOLUTIONOFAPREVIOUSLYSOLVEDCASETOBUILDASOLUTIONFORANEWPROBLEMWITHTHEFOLLOWINGFOURSTEPSRETRIEVE,REUSE,REVISE,ANDRETAIN1THISISAMOREUSEFULMETHODTHANTHEUSEOFANEXPERTSYSTEMTOSIMULATEHUMANTHOUGHTBECAUSEPROPOSINGASIMILARCASEANDAPPLYINGAFEWMODIFICATIONSSEEMSTOBESELFEXPLANATORYANDMOREINTUITIVETOHUMANSSOVARIOUSCASEBASEDDESIGNSUPPORTTOOLSHAVEBEENDEVELOPEDFORNUMEROUSAREAS24,SUCHASININJECTIONMOLDINGANDDESIGN,ARCHITECTURALDESIGN,DIECASTINGDIEDESIGN,PROCESSPLANNING,ANDALSOINFIXTUREDESIGNSUNUSEDSIXDIGITALSTOCOMPOSETHEINDEXCODETHATINCLUDEDWORKPIECESHAPE,MACHINEPORTION,BUSHING,THE1STLOCATINGDEVICE,THE2NDLOCATINGDEVICEANDCLAMPINGDEVICE5BUTTHESYSTEMCANNOTBEUSEDFOROTHERFIXTURETYPESEXCEPTFORDRILLFIXTURES,ANDCANNOTSOLVETHEPROBLEMOFSTORAGEOFTHESAMEINDEXCODETHATNEEDSTOBERETAINED,WHICHISVERYIMPORTANTINCBR61CONSTRUCTIONOFACASEINDEXANDCASELIBRARY11CASEINDEXTHECASEINDEXSHOULDBECOMPOSEDOFALLFEATURESOFTHEWORKPIECE,WHICHAREDISTINGUISHEDFROMDIFFERENTFIXTURESUSINGALLOFTHEMWOULDMAKETHEOPERATIONINCONVENIENTBECAUSETHEFORMSOFTHEPARTSAREDIVERSE,ANDTHETECHNOLOGYREQUIREMENTSOFMANUFACTUREINTHEENTERPRISEALSODEVELOPCONTINUOUSLY,LOTSOFFEATURESUSEDASTHECASEINDEXWILLMAKETHESEARCHRATESLOW,ANDTHEMAINFEATUREUNIMPORTANT,FORTHEREASONTHATTHERELATIVEWEIGHTWHICHISALLOTTEDTOEVERYFEATUREMUSTDIMINISHANDONTHEOTHERHAND,ITISHARDTOINCLUDEALLTHEFEATURESINTHECASEINDEXTHEREFORE,CONSIDERINGTHEPRACTICALITYANDTHEDEMANDOFRAPIDDESIGN,THECASEINDEXINCLUDESBOTHTHEMAJORFEATUREOFTHEWORKPIECEANDTHESTRUCTUREOFFIXTURETHECASEINDEXCODEISMADEUPOF16DIGITS13DIGITSFORCASEFEATURESAND3DIGITSFORCASEIDENTIFICATIONNUMBERTHEFIRST13DIGITSREPRESENT13FEATURESEACHDIGITISCORRESPONDINGTOANATTRIBUTEOFTHEFEATURE,WHICHMAYBEONEOF“”,“”,“1”,“2”,,“A”,“B”,,“Z”,,ETCINWHICH,“”MEANSANYONE,“”UNCERTAIN,“0”NOTHINGTHESYSTEMRULESFIXTURETYPE,WORKPIECESHAPE,LOCATINGMODELCANNOTBE“”OR“”WHENTHESYSTEMISDESIGNED,THEATTRIBUTEINFORMATIONOFTHETHREEITEMSDOESNOTHAVETHESEOPTIONS,WHICHMEANSTHECERTAINATTRIBUTEMUSTBESELECTEDTHELASTTHREEDIGITSARETHECASEIDENTIFICATIONNUMBER,WHICHMEANSTHE13DIGITSOFTHECASEFEATUREARETHESAME,ANDTHENUMBEROFTHESETHREEDIGITSISUSEDFORDISTINGUISHINGTHEMTHESYSTEMALSORULES“000”ISAPROTOTYPECASE,WHICHISUSEDFORRETRIEVAL,ANDOTHERCASESARE“001”,“002”,,WHICHAREUSEDFORREFERENCECASESTOBESEARCHEDBYDESIGNERSIFOCCASIONALLYONEOFTHEMNEEDSTOBECHANGEDASTHEPROTOTYPECASE,FIRSTITMUSTBEREQUIREDTOAPPLYTOCHANGETHEONETO“000”,ANDTHEFORMERISCHANGEDTOREFERENTIALCASEAUTOMATICALLYTHECONSTRUCTIONOFTHECASEINDEXCODEISSHOWNINFIG112CASELIBRARYTHECASELIBRARYCONSISTSOFLOTSOFPREDEFINEDCASESCASEREPRESENTATIONISONEOFTHEMOSTIMPORTANTISSUESINCASEBASEDREASONINGSOCOMPOUNDINGWITHTHEINDEXCODE,13HIERARCHICALFORMOFCASETHESTRUCTURESIMILARITYOFTHEFIXTUREISREPRESENTEDASTHEWHOLEFIXTURESIMILARITY,COMPONENTSSIMILARITYANDCOMPONENTSIMILARITYSOTHEWHOLEFIXTURECASELIBRARY,COMPONENTSCASELIBRARY,COMPONENTCASELIBRARYOFFIXTUREAREFORMEDCORRESPONDINGLYUSUALLYDESIGNINFORMATIONOFTHEWHOLEFIXTUREISCOMPOSEDOFWORKPIECEINFORMATIONANDWORKPIECEPROCEDUREINFORMATION,WHICHREPRESENTTHEFIXTURESATISFYINGTHESPECIFICALLYDESIGNINGFUNCTIONDEMANDTHEWHOLEFIXTURECASEISMADEUPOFFUNCTIONCOMPONENTS,WHICHAREDESCRIBEDBYTHEFUNCTIONCOMPONENTS’NAMESANDNUMBERSTHECOMPONENTSCASEREPRESENTSTHEMEMBERSFUNCTIONCOMPONENTANDOTHERSTRUCTURECOMPONENTS,MAINDRIVENPARAMETER,THENUMBER,ANDTHEIRCONSTRAINRELATIONSTHECOMPONENTCASETHELOWESTLAYEROFTHEFIXTUREISTHESTRUCTUREOFFUNCTIONCOMPONENTANDOTHERCOMPONENTSINTHEMODERNFIXTUREDESIGNTHEREARELOTSOFPARAMETRICSTANDARDPARTSANDCOMMONNONSTANDARDPARTSSOTHECOMPONENTCASELIBRARYSHOULDRECORDTHESPECIFICATIONPARAMETERANDTHEWAYINWHICHITKEEPSTHEM2STRATEGYOFCASERETRIEVALINTHECASEBASEDDESIGNOFFIXTURES,THEMOSTIMPORTANTTHINGISTHERETRIEVALOFTHESIMILARITY,WHICHCANHELPTOOBTAINTHEMOSTSIMILARCASE,ANDTOCUTDOWNTHETIMEOFADAPTATIONACCORDINGTOTHEREQUIREMENTOFFIXTUREDESIGN,THESTRATEGYOFCASERETRIEVALCOMBINESTHEWAYOFTHENEARESTNEIGHBORANDKNOWLEDGEGUIDEDTHATIS,FIRSTSEARCHONDEPTH,THENONBREADTH;THEKNOWLEDGEGUIDEDSTRATEGYMEANSTOSEARCHONTHEKNOWLEDGERULEFROMROOTTOTHEOBJECT,WHICHISFIRSTLYSEARCHEDBYTHEFIXTURETYPE,THENBYTHESHAPEOFTHEWORKPIECE,THIRDLYBYTHELOCATINGMETHODFOREXAMPLE,IFTHECASEINDEXCODEINCLUDESTHEMILLINGFIXTUREOFFIXTURETYPE,THESEARCHISJUSTFORALLMILLINGFIXTURES,THENFORBOXOFWORKPIECESHAPE,THETHIRDFOR1PLANE2PINEOFLOCATINGMETHODIFTHEREISNOMATCHOFIT,THENTHESEARCHSTOPSONDEPTH,ANDRETURNSTOTHEUPPERLAYER,ANDRETRIEVESALLTHERELATIVECASESONBREADTHRETRIEVALALGORITHMS1ACCORDINGTOTHECASEINDEXINFORMATIONOFFIXTURECASELIBRARY,SEARCHTHERELEVANTCASELIBRARY;2MATCHTHECASEINDEXCODEWITHTHECODEOFEACHCASEOFTHECASELIBRARY,ANDCALCULATETHEVALUEOFTHESIMILARITYMEASURE;3SORTTHEORDEROFSIMILARITYMEASURE,THEBIGGESTVALUE,WHICHISTHEMOSTANALOGICALCASESIMILARITYBETWEENTWOCASESISBASEDONTHESIMILARITYBETWEENTHETWOCASESFEATURESTHECALCULATIONOFSIMILARITYMEASUREDEPENDSONTHETYPEOFTHEFEATURETHEVALUEOFSIMILARITYCANBECALCULATEDFORNUMERICALVALUES,FOREXAMPLE,COMPAREWORKPIECEWITHTHEWEIGHTOF50KGAND20KGTHEVALUECANALSOBECALCULATEDBETWEENNONNUMERICALVALUES,FOREXAMPLE,NOWTHEFIRST13DIGITSINDEXCODEISALLNONNUMERICALVALUESTHESIMILARITYMEASUREOFAFIXTUREISCALCULATEDASFOLLOWSWHERESISTHESIMILARITYMEASUREOFCURRENTFIXTURE,NISTHENUMBEROFTHEINDEXFEATURE,ISTHEWEIGHTOFEACHFEATURE,ISTHESIMILARITYMEASUREOFTHEATTRIBUTEOFTHEI2THFEATUREWITHTHEATTRIBUTEOFRELATIVEFEATUREOFTHEJTHCASEINTHECASELIBRARYATTHESAMETIME,,THEVALUECOUNTSASFOLLOWSWHEREISTHEVALUEOFTHEINDEXATTRIBUTEOFTHEITHFEATURE,ANDISTHEVALUEOFATTRIBUTEOFTHERELATIVEITHFEATUREOFTHEJTHCASEINCASELIBRARYSOTHEREARETWOMETHODSTOSELECTTHEANALOGICALFIXTUREONEISTOSETTHEVALUEIFTHEVALUESOFSIMILARITYMEASUREOFCURRENTCASESWERELESSTHANAGIVENVALUE,THOSECASESWOULDNOTBESELECTEDASANALOGICALCASESWHENTHECASELIBRARYISINITIALLYSETUP,ANDTHEREAREONLYAFEWCASES,THEVALUECANBESETSMALLERIFTHEREARELOTSOFANALOGICALCASES,THEVALUESHOULDGETLARGERTHEOTHERISJUSTTOSETTHENUMBEROFTHEANALOGICALCASESSUCHAS10,WHICHISTHELARGESTVALUEOFSIMILARITYMEASUREFROMTHESORTEDORDER3CASEADAPTATIONANDCASESTORAGE31CASEADAPTATIONTHEMODIFICATIONOFTHEANALOGICALCASEINTHEFIXTUREDESIGNINCLUDESTHEFOLLOWINGTHREECASES1THESUBSTITUTIONOFCOMPONENTSANDTHECOMPONENT;2ADJUSTINGTHEDIMENSIONOFCOMPONENTSANDTHECOMPONENTWHILETHEFORMREMAINS;3THEREDESIGNOFTHEMODELIFTHECOMPONENTSANDCOMPONENTOFTHEFIXTUREARECOMMONOBJECTS,THEYCANBEEDITED,SUBSTITUTEDANDDELETEDWITHTOOLS,WHICHHAVEBEENDESIGNED32CASESTORAGEBEFORESAVINGANEWFIXTURECASEINTHECASELIBRARY,THEDESIGNERMUSTCONSIDERWHETHERTHESAVINGISVALUABLEIFTHECASEDOESNOTINCREASETHEKNOWLEDGEOFTHESYSTEM,ITISNOTNECESSARYTOSTOREITINTHECASELIBRARYIFITISVALUABLE,THENTHEDESIGNERMUSTANALYZEITBEFORESAVINGITTOSEEWHETHERTHECASEISSTOREDASAPROTOTYPECASEORASREFERENCECASEAPROTOTYPECASEISAREPRESENTATIONTHATCANDESCRIBETHEMAINFEATURESOFACASEFAMILYACASEFAMILYCONSISTSOFTHOSECASESWHOSEINDEXCODESHAVETHESAMEFIRST13DIGITSANDDIFFERENTLASTTHREEDIGITSINTHECASELIBRARYTHELASTTHREEDIGITSOFAPROTOTYPECASEAREALWAYS“000”AREFERENCECASEBELONGSTOTHESAMEFAMILYASTHEPROTOTYPECASEANDISDISTINGUISHEDBYTHEDIFFERENTLASTTHREEDIGITSFROMTHECONCEPTTHATHASBEENEXPLAINED,THEFOLLOWINGSTRATEGIESAREADOPTED1IFANEWCASEMATCHESANYEXISTINGCASEFAMILY,ITHASTHESAMEFIRST13DIGITSASANEXISTINGPROTOTYPECASE,SOTHECASEISNOTSAVEDBECAUSEITISREPRESENTEDWELLBYTHEPROTOTYPECASEORISJUSTSAVEDASAREFERENCECASETHELAST3DIGITSARENOT“000”,ANDNOTTHESAMEWITHOTHERSINTHECASELIBRARY2IFANEWCASEMATCHESANYEXISTINGCASEFAMILYANDISTHOUGHTTOBEBETTERATREPRESENTINGTHISCASEFAMILYTHANTHEPREVIOUSPROTOTYPECASE,THENTHEPROTOTYPECASEISSUBSTITUTEDBYTHISNEWCASE,ANDTHEPREVIOUSPROTOTYPECASEISSAVEDASAREFERENCECASE3IFANEWCASEDOESNOTMATCHANYEXISTINGCASEFAMILY,ANEWCASEFAMILYWILLBEGENERATEDAUTOMATICALLYANDTHECASEISSTOREDASTHEPROTOTYPECASEINTHECASELIBRARY4PROCESSOFCBRINFIXTUREDESIGNACCORDINGTOTHECHARACTERISTICSOFFIXTUREDESIGN,THEBASICINFORMATIONOFTHEFIXTUREDESIGNSUCHASTHENAMEOFFIXTURE,PART,PRODUCTANDTHEDESIGNER,ETCMUSTBEINPUTFIRSTTHENTHEFIXTUREFILEISSETUPAUTOMATICALLY,INWHICHALLCOMPONENTSOFTHEFIXTUREAREPUTTOGETHERTHENTHEMODELOFTHEWORKPIECEISINPUTORDESIGNEDTHEDETAILEDINFORMATIONABOUTTHEWORKPIECEISINPUT,THECASEINDEXCODEISSETUP,ANDTHENTHECBRBEGINSTOSEARCHTHEANALOGICALCASES,RELYINGONTHESIMILARITYMEASURE,ANDTHEMOSTANALOGICALCASEISSELECTEDOUTIFNEEDED,THECASEISADAPTEDTOSATISFYTHECURRENTDESIGN,ANDRESTOREDINTOTHECASELIBRARYTHEFLOWCHARTOFTHEPROCESSISSHOWNINFIG3
编号:201311171600117065    类型:共享资源    大小:450.50KB    格式:DOC    上传时间:2013-11-17
  
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