欢迎来到人人文库网! | 帮助中心 人人文库renrendoc.com美如初恋!
人人文库网
首页 人人文库网 > 资源分类 > PDF文档下载

外文翻译--基于微遗传算法的最优浇口定位在注塑设计中的应用 英文版.pdf

  • 资源大小:667.14KB        全文页数:10页
  • 资源格式: PDF        下载权限:游客/注册会员/VIP会员    下载费用:5
游客快捷下载 游客一键下载
会员登录下载
下载资源需要5

邮箱/手机号:
您支付成功后,系统会自动为您创建此邮箱/手机号的账号,密码跟您输入的邮箱/手机号一致,以方便您下次登录下载和查看订单。注:支付完成后需要自己下载文件,并不会自动发送文件哦!

支付方式: 微信支付    支付宝   
验证码:   换一换

友情提示
2、本站资源不支持迅雷下载,请使用浏览器直接下载(不支持QQ浏览器)
3、本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰   

外文翻译--基于微遗传算法的最优浇口定位在注塑设计中的应用 英文版.pdf

GJOURNALOFMECHANICALSCIENCEANDTECHNOLOGY212007789798JOURNALOFMECHANICALSCIENCEANDTECHNOLOGYMICROGENETICALGORITHMBASEDOPTIMALGATEPOSITIONINGININJECTIONMOLDINGDESIGNJONGSOOLEE,JONGHUNKIMSCHOOLOFMECHANICALENGINEERINGYONSEIUNIVERSITY,SEOUL120749KOREAMANUSCRIPTRECEIVEDDECEMBER12,2006;REVISEDMARCH26,2007;ACCEPTEDMARCH26,2007ABSTRACTTHEPAPERDEALSWITHTHEOPTIMIZATIONOFRUNNERSYSTEMININJECTIONMOLDINGDESIGNTHEDESIGNOBJECTIVEISTOLOCATEGATEPOSITIONSBYMINIMIZINGBOTHMAXIMUMINJECTIONPRESSUREATTHEINJECTIONPORTANDMAXIMUMPRESSUREDIFFERENCEAMONGALLTHEGATESONAPRODUCTWITHCONSTRAINTSONSHEARSTRESSAND/ORWELDLINETHEANALYSISOFFILLINGPROCESSISCONDUCTEDBYAFINITEELEMENTBASEDPROGRAMFORPOLYMERFLOWMICROGENETICALGORITHMMGAISUSEDASAGLOBALOPTIMIZATIONTOOLDUETOTHENATUREOFINHERENTNONLINEARLITYINFLOWANALYSISFOURDIFFERENTDESIGNAPPLICATIONSININJECTIONMOLDSAREEXPLOREDTOEXAMINETHEPROPOSEDDESIGNSTRATEGIESTHEPAPERSHOWSTHEEFFECTIVENESSOFMGAINTHECONTEXTOFOPTIMIZATIONOFRUNNERSYSTEMININJECTIONMOLDINGDESIGNGKEYWORDSMICROGENETICALGORITHM;DESIGNOPTIMIZATION;FILLINGINJECTIONMOLD1INTRODUCTIONINJECTIONMOLDINGPROCESSHASBEENRECOGNIZEDASONEOFTHEMOSTEFFICIENTMANUFACTURINGTECHNOLOGIESSINCEHIGHPERFORMANCEPOLYMERMATERIALSCANBEUTILIZEDTOACCURATELYMANUFACTUREAPRODUCTWITHCOMPLICATEDSHAPECHIANG,ETAL,1991;CHANGANDYANG,2001;HIMASEKHAR,ETAL,1992;KWONANDPARK,2004ALSO,THEDEMANDONINJECTIONMOLDEDPRODUCTSSUCHASFROMCONVENTIONALPLASTICGOODSTOMICROOPTICALDEVICESISBEINGDRAMATICALLYINCREASEDOVERTHERECENTYEARSPIOTTER,ETAL,2001;KANG,ETAL,2000INGENERAL,THEINJECTIONMOLDPROCESSISINITIATEDBYTHEFILLINGSTAGEWHERETHEPOLYMERMATERIALSFILLINTOACAVITYUNDERTHEINJECTIONTEMPERATUREAFTERTHECAVITYISCOMPLETELYFILLED,THEPOSTFILLINGSTAGE,THATIS,THEPACKINGSTAGEISCONDUCTEDTOBEADDITIONALLYFILLEDWITHTHEHIGHPRESSUREPOLYMER,THEREBYRESULTINGINTHEAVOIDANCEOFMATERIALSHRINKAGESUBSEQUENTLY,THECOOLINGSTAGEISREQUIREDFORAMOLDEDPRODUCTTOBEEJECTEDWITHOUTANYDEFORMATIONITISIMPORTANTTOACCOMMODATETHEMOLDINGCONDITIONSINTHEFILLINGSTAGESINCEITISTHEFIRSTSTAGEINTHEOVERALLINJECTIONMOLDINGDESIGNZHOUANDDLI,2001AFTERTHAT,ONECANSUCCESSFULLYEXPECTMOREIMPROVEDMOLDINGCONDITIONSDURINGPOSTFILLINGSTAGESSUCHASPACKING,COOLINGSTAGESTHEPAPERDEALSWITHOPTIMALCONDITIONSOFTHEFILLINGINJECTIONMOLDINGDESIGNINWHICHTHEFLOWPATTERNANDPRESSUREFORTHEPOLYMERMATERIALSTOBEFILLEDTHROUGHGATESOFARUNNERAREOFSIGNIFICANTTHATIS,ONEOFDESIGNREQUIREMENTSARESUCHTHATWHENTHEPOLYMERCOMESINTOACAVITYTHROUGHANUMBEROFGATESLOCATEDATDIFFERENTPOSITIONS,PRESSURELEVELSONTHESURFACEOFAPRODUCTSHOULDBEASUNIFORMASPOSSIBLESUCHDESIGNCANBEPERFORMEDTHROUGHTHEINTELLIGENTGATEPOSITIONINGTOGENERATETHEMORECORRESPONDINGAUTHORTEL82221234474;FAX8223622736EMAILADDRESSJLEEJYONSEIACKR790JONGSOOLEEANDJONGHUNKIM/JOURNALOFMECHANICALSCIENCEANDTECHNOLOGY212007740749UNIFORMDISTRIBUTIONOFINJECTIONPRESSUREOVERTHEPRODUCTSURFACETHEREHAVEBEENANUMBEROFSTUDIESOFOPTIMALGATELOCATIONINTHECONTEXTOFCAEFILLINGINJECTIONMOLDINGDESIGNPROBLEMSWHEREVARIOUSKINDSOFOPTIMIZERHAVEBEENEMPLOYEDTOCONDUCTDESIGNOPTIMIZATIONKIMETAL,1996;YOUNG,1994;PANDELIDISANDZOU,2004;LIN,2001;LIANDSHEN,1995THEPAPEREXPLORESTHEDESIGNOFINJECTIONMOLDSYSTEMUSINGMICROGENETICALGORITHMMGAGENETICALGORITHMCONVENTIONALGAISBASEDONTHEDARWIN’STHEORYOFTHESURVIVALOFTHEFITTEST,ANDADOPTSTHECONCEPTOFNATURALEVOLUTION;THECOMPETITIVEDESIGNSWITHMOREFITARESURVIVEDBYSELECTION,ANDTHENEWDESIGNSARECREATEDBYCROSSOVERANDMUTATIONLEE,1996;LEEANDHAJELA,1996ACONVENTIONALGAWORKSWITHAMULTIPLENUMBEROFDESIGNSINAPOPULATIONHANDLINGWITHSUCHDESIGNSRESULTSININCREASINGAHIGHERPROBABILITYOFLOCATINGAGLOBALOPTIMUMASWELLASMULTIPLELOCALOPTIMAGAISALSOADVANTAGEOUSWHENTHEDESIGNPROBLEMISREPRESENTEDBYAMIXTUREOFINTEGER/DISCRETEANDCONTINUOUSDESIGNVARIABLESNEVERTHELESS,ITREQUIRESEXPENSIVECOMPUTATIONALCOSTSESPECIALLYWHENCOMBININGWITHFINITEELEMENTBASEDCAEANALYSISTOOLSACONVENTIONALGADETERMINESTHEPOPULATIONSIZEDEPENDINGUPONTHESTRINGLENGTHOFACHROMOSOMETHATISACODEDVALUEOFASETOFDESIGNVARIABLESTHEMAINDIFFERENCEBETWEENACONVENTIONALGAANDMGARESIDESONTHEPOPULATIONSIZETHEPOPULATIONSIZEINMGAISBASEDONGOLDBERG’SCONCEPTSUCHTHAT‘EVOLUTIONPROCESSISPOSSIBLEWITHSMALLPOPULATIONSTOREDUCETHECOSTOFFITNESSFUNCTIONEVALUATION’GOLDBERG,1988THISIMPLIESTHATMGAEMPLOYSAFEWNUMBEROFPOPULATIONSFORGAEVOLUTIONREGARDLESSOFTHENUMBEROFDESIGNVARIABLESANDTHECOMPLEXITYOFDESIGNPARAMETERSKRISHNAKUMAR,1989;DENNISANDDULIKRAVICH,2001THEPAPERDISCUSSESTHEDESIGNREQUIREMENTSOFFILLINGINJECTIONMOLDOPTIMIZATIONTOCONSTRUCTTHEPROPEROBJECTIVEFUNCTIONSANDDESIGNCONSTRAINTSFOURDIFFERENTDESIGNAPPLICATIONSININJECTIONMOLDSAREEXPLOREDTOEXAMINETHEPROPOSEDDESIGNSTRATEGIESTHEPAPERSHOWSTHEEFFECTIVENESSOFMGAINTHECONTEXTOFOPTIMIZATIONOFRUNNERSYSTEMININJECTIONMOLDINGDESIGN2MOLDFLOWANALYSISTHEFLOWOFAPOLYMERININJECTIONMOLDINGPROCESSOBEYSTHEFOLLOWINGGOVERNINGEQUATIONS220PPSSXXYYWWWWWWWW1222PXYTTTTCKTXYZUQQKJWWWWWWWW2WHERE,220HZSDZKINTHEABOVEEQUATIONS,PISAFLOWPRESSURE,TISATEMPERATUREOFPOLYMER,ANDTISDENOTEDASTIMEPARAMETERSK,J,ANDKAREVISCOSITY,SHEARRATEANDTHERMALCONDUCTIVITY,RESPECTIVELYLEE,2003ITISASSUMEDTHATPOLYMERISANONCOMPACTIONSUBSTANCEINTHEFILLINGANALYSISTHEFLOWANALYSISINTHEPRESENTSTUDYISCONDUCTEDBYCOMPUTERAIDEDPLASTICSAPPLICATIONCAPAKOO,2003,AFINITEELEMENTBASEDCOMMERCIALCODEFORPOLYMERFLOWOFINJECTIONMOLDINGTHERUNNERSYSTEMININJECTIONMOLDCOVERSTHEPASSAGEOFMOLTENPOLYMERFROMINJECTIONPORTTOGATESTHEPRESENTSTUDYDEVELOPSTWODIFFERENTRUNNERSYSTEMSWHEREACOLDSYSTEMREQUIRESTHECHANGEINPOLYMERTEMPERATURE,ANDAHOTSYSTEMKEEPITUNCHANGEDWHILETHEFLOWPASSESTHROUGHTHERUNNERFORTHEHOTRUNNERSYSTEMHASAGEOMETRICALLYCONSISTENTTHICKNESSDUETOTHECONSTANTTEMPERATUREASSHOWNINFIG1AHOWEVER,THECAERESULTOFACOLDRUNNERSYSTEMDEPENDSONTHETHICKNESSANDSHAPETABLE1TENBARTRUSSDESIGNRESULTSMICROGACONVENTIONALGACASE1CASE2CASE3CASE1CASE2CASE3REFERENCE20X1786815785815730781790X2041018019010083045010X3838799815820877837810X4505383389397327416390X5012096015110075055010X6041025025010082030010X7641567587584674630580X8523629552568506526551X9383385505507289386368OPTIMALAREAX10050025025040116042014OPTIMALWEIGHT1599158715881593159015851499OFFUNCTIONEVALUATIONS575405423025335788946949773533JONGSOOLEEANDJONGHUNKIM/JOURNALOFMECHANICALSCIENCEANDTECHNOLOGY212007789798791AHOTRUNNERSYSTEMBCOLDRUNNERSYSTEMFIG1MODELINGOFRUNNERSYSTEMSHAPEOFARUNNERTHETYPICALILLUSTRATIONOFTHEGEOMETRICMODELINACOLDRUNNERSYSTEMISSHOWNINFIG1BWHERETHERUNNERTHICKNESSISCHANGEDACCORDINGTOTHETEMPERATUREGRADIENT3MOLDINGDESIGNREQUIREMENTS31OBJECTIVEFUNCTIONSONEOFTHEMOSTSIGNIFICANTFACTORSCONSIDEREDINTHEINJECTIONMOLDINGDESIGNISAFLOWPATTERN,WHICHIMPLIESTHATABALANCEDFLOWSHOULDBEMAINTAINEDWHILEAPOLYMERARRIVESATEACHPARTOFADESIGNPRODUCTONCETHEIMPROVEMENTONFLOWBALANCEISOBTAINED,THEFLOWOFMOLTENPOLYMERSMOOTHESANDTHEMAXIMUMINJECTIONPRESSUREISDECREASEDWITHTHESAMEORATLEASTEVENLYDISTRIBUTEDINJECTIONPRESSURELEVELATEACHGATEINACASEWHERETHECERTAINPARTOFAPRODUCTWITHINTHEMOLDISFILLEDUPEARLIERTHANOTHERPARTS,EACHPARTWOULDFALLINTOOVERPACKINGANDUNDERPACKINGSITUATIONSDURINGTHEFILLINGPROCESSOFAPOLYMERINTOMOLDSUCHPROBLEMFURTHEREVOKESAMALFORMATIONLIKETWISTINGANDBENDING,RESULTINGFROMTHEDIFFERENCEINCONTRACTIONRATEDURINGTHECOURSEOFCOOLINGOFFTHEDIFFERENCEINPRESSURETRIGGERSTHEFLOWOFPOLYMERDURINGTHEFILLINGPROCESS,INWHICHTHEMAXIMUMINJECTIONPRESSUREISDETECTEDATTHEINJECTIONPORTOFPOLYMERTHEPOLYMERALWAYSFLOWSFROMHIGHPRESSUREREGIONTOLOWPRESSUREONEWHENAFLOWPATTERNIMPROVES,THEFLOWOFPOLYMERGETSSMOOTHERWITHTHEMAXIMUMINJECTIONPRESSUREDECREASEDHOWEVER,THEFLOWINSTABILITYSOMETIMESHAPPENS,THEREBYREQUIRINGAHIGHERPRESSURETOFILLUPTHATIS,THEMAXIMUMINJECTIONPRESSURENEEDSTOBEREDUCEDINORDERTOIMPROVETHEFLOWINSTABILITYTHEPRESSUREGAPIE,THEHIGHESTANDLOWESTPRESSUREVALUESAMONGALLOFGATESISALSOTAKENASANOTHEROBJECTIVEFUNCTIONTODETERMINEWHETHERTHEWHOLEMOLDISBEINGFILLEDATONCEMOSTCOMMONLYACCEPTEDDESIGNSTRATEGYTOIMPROVETHEFLOWPATTERNISTHEADJUSTMENTOFGATELOCATIONTHEPRESENTSTUDYCONTROLSTHEFLOWPATTERNBYDEVELOPINGTHEOPTIMALGATEPOSITIONINGPROBLEMSWITHPROPEROBJECTIVEFUNCTIONSANDDESIGNCONSTRAINTSOBJECTIVEFUNCTIONSFORINJECTIONMOLDINGDESIGNARECONSIDEREDASBOTH‘MAXIMUMINJECTIONPRESSURE’MIPAND‘MAXIMUMPRESSUREDIFFERENCE’MPDITSHOULDBENOTEDTHATTHEMAXIMUMINJECTIONPRESSUREISCALCULATEDATTHEINJECTIONPORTANDTHEMAXIMUMPRESSUREDIFFERENCEISANUMERICALDIFFERENCEBETWEENTHEHIGHESTANDLOWESTVALUESOFPRESSUREAMONGALLOFGATESTHEAFOREMENTIONEDSTATEMENTSCOULDBEINTERPRETEDASAMULTIOBJECTIVEDESIGNPROBLEM,HENCETHEPRESENTSTUDYSIMPLYEMPLOYSAWEIGHTINGMETHODASFOLLOWSMIPXMPDXFXMIPMPDDE3WHERE,DANDEAREWEIGHTINGFACTORSASDE1,ANDXISASETOFDESIGNVARIABLESWHICHARECARTESIANCOORDINATESOFGATESONAPRODUCTEACHCOMPONENTINTHEABOVEEQUATIONISNORMALIZEDBYOPTIMALSINGLEOBJECTIVEFUNCTIONVALUE,IE,MIP,MPDITISMENTIONEDTHATTHENUMBEROFGATESISCONSIDEREDASAPROBLEMPARAMETERINTHESTUDY31CONSTRAINTSWELDLINESAREEASILYDETECTEDWHENMORETHANTWOFLOWFRONTSHAVINGDIFFERENTTEMPERATUREVALUESMEETDURINGTHEFILLINGPROCESSTHEWELDLINEISONEOFTHEWEAKESTPOINTSINMOLDEDPRODUCT;ITISVERY792JONGSOOLEEANDJONGHUNKIM/JOURNALOFMECHANICALSCIENCEANDTECHNOLOGY212007740749VULNERABLETOASHOCKANDSUBSEQUENTLYCAUSESEXTERNALDEFECTSOFAVERYGLOSSYPOLYMERTHEWELDLINESHOULDBEMOVEDINTOALESSWEAKREGIONBYADJUSTINGTHEWIDTHOFAPRODUCT,THESIZEAND/ORSHAPEOFGATESANDRUNNERS,ANDTHEPOSITIONOFGATES,ETCTHEPRESENTSTUDYCONSIDERSTHEPOSITIONOFAWELDLINEASACONSTRAINTINOPTIMALGATEPOSITIONINGOFMOLDDESIGNONCEADESIGNERSPECIFIESAREASWHEREWELDLINESSHOULDNOTBEGENERATED,ALLOFTHEFINITEELEMENTNODESINSUCHAREASARECONSTRAINEDNOTTOFORMTHEWELDLINESSHEARSTRESSISDEFINEDASASHEARFORCEIMPOSEDONTHEWALLOFAMOLDBYTHESHEARFLOWOFAPOLYMERTHEMAGNITUDEOFSHEARSTRESSISPROPORTIONALTOTHEPRESSUREGRADIENTOFEACHPOSITIONINGENERAL,THESHEARSTRESSISZEROATTHECENTEROFAMOLDEDPRODUCT,ANDREACHESAMAXIMUMVALUEONTHEWALLHIGHSHEARSTRESSTRIGGERSTHEMOLECULECULTIVATIONONTHESURFACEOFAMOLDEDPRODUCTFLOWINSTABILITYSUCHASMELTFRACTUREHASACLOSERELATIONSHIPWITHTHESHEARSTRESSTHECLEARSURFACEOFAMOLDEDPRODUCTCANBEOBTAINEDBYREDUCINGTHEMAGNITUDEOFSHEARSTRESSTHATIS,SHEARSTRESSSHOULDBEMINIMIZEDDURINGTHEMOLDFILLINGPROCESSINORDERTOIMPROVETHEQUALITYOFAMOLDEDPRODUCT,PARTICULARLYONITSSURFACEMAXIMUMALLOWABLESHEARSTRESSDEPENDSONTHEKINDSOFPOLYMER,ANDISGENERALLYTAKENAS1OFTENSILESTRENGTHOFAPOLYMERSHEARSTRESSAFFECTING

注意事项

本文(外文翻译--基于微遗传算法的最优浇口定位在注塑设计中的应用 英文版.pdf)为本站会员(英文资料库)主动上传,人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知人人文库网(发送邮件至renrendoc@163.com或直接QQ联系客服),我们立即给予删除!

温馨提示:如果因为网速或其他原因下载失败请重新下载,重复下载不扣分。

关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服客服 - 联系我们

网站客服QQ:2846424093    人人文库上传用户QQ群:460291265   

copyright@ 2016-2018  renrendoc.com 网站版权所有   南天在线技术支持

经营许可证编号:苏ICP备12009002号-5