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简介：一天，美术课上，老师要同学们画一幅抽象画。

简介：MynameisAngel.I’malovelygirl.I’minClassThree,GradeSix.Ihavemanyhobbies.Ilikedrawingandreading.Ialsolikeplayingthepiano.ButIlikedrawingbest.Iamgoodatdrawing.Icandrawmany

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简介：Amingatwaterconservancyprojectvisualization,ahidden-removalmethodofdamperspectivedrawingsisrealizedbybuildingahidden-removalmathematicalmodelforoverlappingpointslocationtosetupthehiddenrelationshipamongpointandplane,planeandplaneinspace.Onthisbasis,asanexampleofpanelrockfilldam,adamhidden-removalperspectivedrawingisgeneratedindifferentdirectionsanddifferentvisualanglesthroughadaptingVC++andOpenGLvisualizingtechnology.Theresultsshowthatthedataconstructionofthemodelissimplewhichcanovercomethedisadvantagesofconsiderableandcomplicatedcalculation.Thismethodalsoprovidesthenewmeanstodrawhidden-removalperspectivedrawingsforthoselandformsandgroundobjects.

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简介：Theeffectsofhighdrawingspeedsonparametersofholeyfibersarepresented.Aholeyfiberpreformstructurewasmadebyusingtube-in-tubemethodandwasdrawnathighspeedswithanaimofmassproductiontomeetthedemandofnextgenerationcommunicationsystems.Transmissionparameterssuchasnumericalapertureandnormalizedfrequencyofthefabricatedholeyfibershavebeenmeasuredandcomparedwiththeoreticalvaluesbasedoneffectiveindexmethod.Althoughthefabricatedholeyfiberswerenotofhighquality,theanalysesoftheparametershaveshownpromisingoutlookforfabricationofsuchfibers.

简介：Internethasgraduallydemonstratedmoreandmoresuperiorityinmoderneducationsystem.Theintelligentonlinedrawingplatformbasedonnetwillprovidelearnerswithastudyingenvironmentwithoutlimitationintimeandspace.Basedonthetheoryofgraphics,thispaperdevelopedanintelligentonlinedrawingplatform(IODP)withJavathroughanalyzingtheteachingcharacterofdescriptivegeometry.IODPdevelopednotonlyhasaflexibledrawingenvironmentwiththefunctionofmutualdrawing,butalsoisabletojudgethedrawingmadebystudentsandgivefeedbackatthesametime.ThisplatformgivesaneffectivewayforInterneteducationonengineeringgraphics.

简介：AtpresentmanyCADsoftwareproductsdidnotfullymeettherequirementsofNationalStandard《TechnicaldraftingandMechanicalDrawing》thatgreatlyaffectsthequalityandspeedofengineeringdesign.Takingcomputer-aideddesignoftypicalmechanicalpartsasanexample,thispaperproposesanapproachtodevelopcorrespondingfunctionsinCADsoftwaretoenhancethestandardizationofengineeringdesign.

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简介：这研究利用模糊分析层次过程(FAHP)关于第三产生的无线通讯(3GWC)分析决策模式，并且提供设定的战略建议给服务采纳关于在中国3GWC市场的上下文出售和资源分配满足的3GWC的供应商。首先，3GWC采纳因素的一个三层的层次被指相关文学和工业报告开发。在模糊AHP格式的pairwise比较的一张问询表然后被设计并且散布到上海的熟悉电话听筒市场的专家，中国。这些调查然后用模糊AHP被分析建立重量的理解和各种各样的因素的影响。结果证明为3GWC系统的采纳的四个很重要的因素：(i)电话听筒价格和声音和数据传播费用；(ii)电话听筒美学；(iii)个人化；并且(iv)联网范围。这些调查结果建议如此的服务的供应商应该设定并且多样化他们提供并且保证网络的速度和可靠性存取的内容/申请。另外，电话听筒图案应该根据消费者要求。如果这些步能被完成，那么，消费者们将更快采用3GWC服务。

简介：AnewapproachisproposedforautomaticallycreatingB-repmodelsofathree-dimensionalplanarobjectfromalinedrawingdepictingtheobjectunderorthographicallyaxonometricprojection.Anewlineparameterizationthatsatisfiestheuniqueness,boundednessanduniformnessforrepresentinglinesin2Dand3Dspaceisgiven.Accordingtothelocationrelationbetweenlinesandplanesofobjectdepictedbythelinedrawing,someconstraintsaboutobject's3Dinformationareproducedandalinearsystembasedonthoseconstraintsisestablished.3Dinformationofaplanarbodycanbeobtainedbysolvingthelinearsystem.Itisprovedthat,duringtheprocessing,thereexistedatleastfourdegreesoffreedom.ItismoreconvenienttouseinformationaboutlinesandplanesinsteadofpointsandplanesforcomputervisionandintelligentCADsystemstointerpretlinedrawingsofplanarobjects.

简介：Tooptimizetheprocessparameters,itisnecessarytoexactlypredictfailuremodesduringdeepdrawingofcoatedmetalsheets,wheretwomainfailureformsarefractureandwrinkling.Inthispaper,finiteelementsimulationsbasedoncontinuousdamagemechanicswereusedtostudythefailurebehaviorduringacylindricaldeepdrawingofmetalsheetswithnickelcoating.Itisshownthattakingtheeffectofblankholderforceintoaccount,thesetwofailuremodescanbepredicted.Thesimulationresultsarewellconsistentwiththatobtainedfromexperiments.

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简介：Theshadowofacirclecastingonaunparallelplaneisanellipse,theshadowalgorithminvolvesaperspectiveaffinetransformation.Undercommonlyusedlight,thetransformationmatrixforparallelcirclesofdifferentdiameterscastingshadowsontothesameplaneisidentical.UsingAutoCADtogettheshadowofageneralobjectofrevolution,itonlyneedstotakeaseriesofcirclesalongtheaxisofsymmetryandgettheircorrespondingshadowsofellipses,drawinganenvelopetocoverallthesesilhouettesresultsintherequiredoverallshadow.Thenthediscretepointsofshadowcontourlineareprojectedbackontotheoriginalobjectsurface,shadowontheobjectisobtainedaltogether.

简介：Basedonthenecessityofthreedimensionalmodelingwithcomputerinteachingreform,thispaperisthesummarizationofreformpracticeofteachingengineeringdrawinginourinstitute.Theteachingreformbeginswiththreedimensionalmodelingthatusedcomputerinsteadofboard.Onthebasisoftargetofteachingreform,setofteachingcontent,arrangementofclasshourandteachingmethod,theresearchofteachingpracticehavebeendone,andverygoodeffectsinteachingofengineeringdrawinghavebeenachieved.

简介：Apilotwiredrawingmachineaswellaswireend-pointingrollerwasdeveloped.Usingthesemachines,awiredrawingtestforfourdifferentcoatingmaterialsandtwodifferentlubricantswasperformedasthereductionratioincreasedfrom10%to30%.Materialsusedforasubstrateinthisstudyareplaincarbonsteel(AISI1045)andultralowcarbonbainitesteel.Tocomputethefrictioncoefficientbetweenthecoatinglayerofwireandthesurfaceofdieforaspecificlubricant,aseriesoffiniteelementanalyseswerecarriedout.SEMobservationswerealsoconductedtoinvestigatethesurfacedefectsofwiredeformed.Resultsshowthatthebehaviorofdrawingforcevarieswiththelubricant-typeattheinitialstageofdrawing.Thepowder-typedlubricantwithalargeparticlecausestheretardationoffulllubricationontheentirecontactsurfaceandthelocaldelaminationofcoatinglayeronthewiresurface.Astheflowstressofasubstrateincreases,thedelaminationbecomessevere.

简介：Thehydrodynamicdeepdrawingprocessenablesnetshapeornearnetshapeformingofcomplicatedsheetmetalpartsmadefromdifficultlyformingmaterials,suchasaluminiumorhighstrengthsteels.Basedontheconventionalhydrodynamicdeepdrawingprocess,anewprocess,hydrodynamicdeepdrawingprocess,inwhichradialpressureisappliedtotherimoftheblank,isproposed.ThisnewprocesshasbeenanalysedusingFEMsimulationsandtheobtainedresultshavebeencomparedwiththeexperimentalresults.ThematerialusedintheexperimentswasAl-Mg-Sialloy,andintheFEM-simulationstheelastic-plasticbehaviourofAl-Mg-SialloywasmodelledusingBarlat's89yieldcriteria.