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简介：Selectivelasermelting(SLM)isoneofthemostpopularadditivemanufacturing(AM)technologiesformetalparts.Slicingresult,especiallyforthedifferentdimensionalslicinggeometryanditstopology,playsanimportantrolebecauseofthethermodynamicbehaviorofmetalpowders.Togetcorrectgeometryandreliabletopology,aslicingstrategyforSLMisproposed.Theunavoidablenumericalerrorcausedbysamplingandgeometrictransformationissuppressedfirstly,accordingtoshiftingthez-coordinateofavertexwithasmallvaluesuchtheshiftedvertexisonaslicingplane.Theresultofvertex-shiftingmakesitpossibletoidentifydifferentgeometricfeaturessuchasskinsurfaces,overhangsurfaces,extremeedgesandvolumetricsolid.Second,fromgeometricprimitivesahierarchyofaxis-alignedboundingboxes(AABBs)isconstructedandusedtospeedupintersectionofslicingplanesagainstsetsoftriangles.Allintersectingsegmentsaregivendifferentsignstodepicttheirgeometricortopologicalinformation.Basedthedifferentsigns,thedifferentdimensionalgeometrythatiseventuallyrepresentedbysimpleandanticlockwiseorientedpolygons,areidentified.Finally,thepolygonsareclassifiedandnestedinamulti-treedatastructuresettoproducecorrecttopologicalrelations.Theresultofdigitalandphysicalexperimentsshowstheproposedslicingstrategyisfeasibleandrobust.

简介：Twosystemoptimizationarchitecturesareproposedformissilesystempreliminarydesign,takingintoaccountaerodynamics,weightsandsizing,propulsionandtrajectory.Approximationmethodsareinvestigatedinordertoreduceproblemdimensionalityandtoimprovetheefficiencyofoptimizationprocess.

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简介：ACAD-basedinspectionplanningstrategyforvideomeasuringinstrumentisproposedtoimprovemanufacturingeffectiveness.ThesystemconsistsofavideoprobethatenablesitselftoinspectaworkpiecebasedonaCADmodel.ThemeasurementsoftwareincludesCAIPmoduleandMDPmodule.TheCAIPmoduleisdevelopedbasedonaCADdevelopmentplatformwhosekernelistheOpenCASCADE.Theentiresystemwastested,andrelevantexamplesshowthatthesystemcanaccomplishautomaticinspectionplanningtaskforcommonpartsefficiently.

简介：Mobileplatformdevelopsrapidlyinrecentyears,withitsperformanceandcapacityincreasing.Alargenumberofvirtualrealityapplicationssuchas3Dsimulationandvisualizationhaveappearedonmobileplatform.However,duetorestrictions,suchasthelackofcomputingresourcesandthelimitednetworkbandwidth,thevirtualrealitysystemsonmobileplatformcouldnothavecomparableperformanceastheirpeersondesktopplatform.Takingresourcerestrictionsintoconsideration,trade-offshavebeenmaderegardingthedisplayofvirtualrealitysystems.Weproposeaunifiednetworkschedulingstrategybasedonasynchronousmulti-thread,databasecache,prioritizationandeliminationofoverduerequests.ThisstrategyhasbeentestedontheprototypesystemofvirtualrealitysystemonAndroid.Theresultsdemonstratehighernetworkresourceutilizationandbetteruserexperience.

简介：Repetitioussimulationaftermodifyingparametersofmulti-domainphysicalsystembasedonModelicaoftenappearsinmodelexperimentandoptimizationdesign.Atpresent,thesolversbasedonModelicaneedcalculateallthecoupledblocksduringeverysimulationrunafterupdatingparameters.Basedondiscussingscaledecompositionmethodsofsimulationmodel,subdivisionsolvingstrategyandminimumsolvingstrategyareputforwardtoimprovetheefficiencyofrepetitioussimulation,bywhichthenumericalsolutionofthesimulationmodelcanbeachievedbyonlycalculatingthesolvingsequenceinfluencedbyalteredparameters.Asimplifiedmodelofaircraftisusedtodemonstratetheefficiencyofthestrategiespresented.