简介:Polyamide(PA6)andpolycarbonate(PC)werepreparedbyaBrabendermixer(PLV-151)at240℃with30rpmfordurationof8and6minutesrespectively.Theepoxyresin(E)additioncanleadtosubstantialmicrostructuralchangesinthePA6/PCblends.Scanningelectronmicroscope(SEM)wasusedtoobservethemixturescharacterizedbythedomainsofclearlysegregatedhomophasesandvoidsbetweenthetwopolymers.PA6/PCofpolyamide6andpolycarbonatewithepoxyresinadditionunderthecompositionratioof20/80,20/80/1,40/60/1and40/60,weretestedtoverifythekeyroleofepoxyinpromotingthecompatibilityofPA6withPCduringblending.
简介:Duringtheevolvementofarchitecture,theresearchonarchitecturalformandstructureaswellasdifferentwaystoexpressandrealizearchitecturalthoughtsisconstantlythefocusofmanyarchitects,Thispaperillustratesthemutualinfluenceofthewaysofexpressionanddesignofarchitecturetopeople'sunderstandingofthemeaningofarchitecturethroughoutthehistoryoftheireffortsandexploration.thepaperalsodiscussestheextensiveusageofvirtual-realithapproachthroughcomputertechnology,Itpointsoutthatthetraditionalarchitecturalstandpointwillundergobreakthroughbytheemergenceofnewexpressionanddesignmethod.Inthisway,people'sunderstandingofarchitecturewillbemoreprofoundandlasting.
简介:Inrecentyearswehavewitnessedalargeinterestinsurfacedeformationtechniques.Thishasbeenareactionthatcanbeattributedtotheabilitytodeveloptechniqueswhicharedetail-preserving.Spacedeformationtechniques,ontheotherhand,receivedlessattention,butneverthelesstheyhavemanyadvantagesoversurface-basedtechniques.Thispaperexploresthepotentialofthesetwoapproachestodeformationanddiscussestheopportunitiesthatthefusionofthetwomayleadto.
简介:BymeansofdirectanalysisoftheconnectionbetweenLoopsubdivisionsurfaceanditscontrolmeshandthecomputationofthebasisfunctions,weobtainaboundonthedistancebetweenLoopsubdivisionsurfacepatchanditscontrolmesh.Theboundcanbeusedtocomputethenumbersofsubdivisionforagiventolerance.Finally,twoexamplesarelistedinthispapertodemonstratetheapplicationsofthebound.
简介:Thispapergivesamethodofquantifyingsmallvisualdifferencesbetween3Dmeshmodelswithconformingtopology,basedonthetheoryofstrainfields.Strainfieldisageometricquantityinelasticitywhichisusedtodescribethedeformationofelastomer.Inthispaperweconsiderthe3Dmodelsasobjectswithelasticity.Thefurtherdemonstrationsareprovided:thefirstisintendedtogivethereaderavisualimpressionofhowourmeasureworksinpractice;andthesecondistogivereadersavisualimpressionofhowourmeasureworksinevaluatingfilteralgorithms.Ourexperimentsshowthatourdifferenceestimatesarewellcorrelatedwithhumanperceptionofdifferences.Thisworkhasapplicationsintheevaluationof3Dmeshwatermarking,3Dmeshcompressionreconstruction,and3Dmeshfiltering.
简介:AimingatthegeometricalfeaturesofdifferentcontainmentrelationshipsinRapidPrototyping(RP),ageneralmethodofachievingtheRPlayer’scuspdistributionofthepositive,negativeandmixedtoleranceisproposedtomeetthepart’sdifferentapplications.TheprocedureisexecutedbyprojectingthecurrentandthenextsectionoftheCADmodelontoahorizontalplane,computingtheunionandtheintersectionofthesectionstogettheouterandtheinnerboundary,andthenblendingtheboundariesusingarotaryvectorthroughaproperinnerpointintheintersectiontoachievethecurrentlayer’sscanningcontour.Themethodcanrealizethelayer’scuspdistributionofthemixedtolerancewithunequalcuspheight,expandingtheconnotationofthemixedtolerance.
简介:Theharmonicdriveisakindofgeartransmissionthatuseswavegeneratortoproducecontrollablesoftroundelasticdeformationandengageswithrigidgeartotransmitmotionandpower.Theloaddistributiononthesurfaceoftheflexiblegearandwavegeneratorisanimportantparameterofstudyingthedeformationofflexiblegearandflexiblebearingoutsidethewavegeneratorandisalsoanecessaryconditionforstudyingthefatiguedamageofflexiblegearunderalternatingload.Inthispaper,a3Dmodelof32-type80:1harmonicdriveisbuild.BasedonthegeneralizedHookelaw,ahypothesisofloaddistributionwhichisprovedtobevaliditybyusingfiniteelementsimulationisproposedontheinterfaceofflexiblegearandwavegenerator.Onthisbase,themathematicmodelandthequantitativecalculationformulaoftheloaddistributiononthesurfaceoftheflexiblegearandwavegeneratorareproposedwhichprovideabasisforthedynamicanalysisandthefatiguedamageofharmonicgeardrive.
简介:为车辆适应巡航控制(ACC)系统,切换的性能在之间扼杀并且刹车决定开车舒适,燃料消费和车辆的服务生活机械部件。在这份报纸,有最佳的切换控制在之间的一个ACC算法扼杀并且刹车在模型被设计预兆的控制(MPC)框架。由介绍二进制整数变量,动力学扼杀并且刹车集成于为控制器设计的一模型表情。然后,ACC算法被设计满足不仅安全汽车列在后面,而且最佳的切换在之间扼杀并且刹车,它导致二次的编程由嵌套的二环的方法解决了的一个在网上混合的整数。模拟结果证明建议ACC算法满足安全汽车列在后面的要求,由执行更光滑的回答超过传统的算法,减少切换的时间在之间扼杀并且刹车,并且因此显著地改进开车舒适和燃料效率。
简介:Inthispaper,thesmoothconnectionbetweentwoB-splinesurfacesisdiscussed.First,abriefproofofsomesimplesufficientconditionsofG~0andG~1continuityisgiven.Onthisbasis,anovelmethodforG~0orG~1connectionbetweentwoadjacentB-splinesurfacesispresented.Areparameterizationstepisfirstlytakenforoneofthesurfacessuchthattheyhavethesameparameterizationinvdirection,then,adjusttheirboundarycontrolverticestomakethemG~0orG~1connected.TheG~1connectionparameterisdeterminedbyanoptimizationproblem.Comparedwiththeexistedmethods,ourmethodissimpleandeasytobeusedinpractice.