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【英文标准名称】:Industrialautomationsystemsandintegration-Productdatarepresentationandexchange-Part42:Integratedgenericresource:Geometricandtopologicalrepresentation
【原文标准名称】:工业自动化系统和集成.产品数据表示和交换.第42部分:集成通用资源:几何学和拓扑学表示
【标准号】:ISO10303-42-2003
【标准状态】:现行
【国别】:国际
【发布日期】:2003-04
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/TC184
【标准类型】:()
【标准水平】:()
【中文主题词】:数据交换;定义;信息交流;表示法;描述;EXPRESS;自动化系统;自动化;计算机应用;工业产品;数据;原理;阶段;数据表示;产品数据
【英文主题词】:Automation;Automationsystems;Computerapplications;Data;Dataexchange;Datarepresentation;Definitions;Descriptions;EXPRESS;Industrialproducts;Informationexchange;Principle;Productdata;Representations;STEP
【摘要】:ThispartofISO10303specifiestheresourceconstructsfortheexplicitgeometricandtopologicalrepresentationoftheshapeofaproduct.Thescopeisdeterminedbytherequirementsfortheexplicitrepresentationofanidealproductmodel;tolerancesandimplicitformsofrepresentationintermsoffeaturesareoutofscope.Thegeometryinclause4andthetopologyinclause5areavailableforuseindependentlyandarealsoextensivelyusedbythevariousformsofgeometricshapemodelinclause6.Inaddition,thispartofISO10303specifiesspecialisationsoftheconceptsofrepresentationwheretheelementsofrepresentationaregeometric.1GeometryThefollowingarewithinthescopeofthegeometryschema:—definitionofpoints,vectors,parametriccurvesandparametricsurfaces;—definitionoffinitevolumeswithinternalparametrisation;—definitionoftransformationoperators;—pointsdefineddirectlybytheircoordinatevaluesorintermsoftheparametersofanexistingcurveorsurface;—definitionofconiccurvesandelementarysurfaces;—definitionofcurvesdefinedonaparametricsurface;—definitionofgeneralparametricsplinecurves,surfacesandvolumes;—definitionofpoint,curveandsurfacereplicas;—definitionofoffsetcurvesandsurfaces;—definitionofintersectioncurves.ThefollowingareoutsidethescopeofthispartofISO10303:—allotherformsofprocedurallydefinedcurvesandsurfaces;—curvesandsurfaceswhichdonothaveaparametricformofrepresentation;—anyformofexplicitrepresentationofaruledsurface.NOTEForaruledsurfacethegeometryiscriticallydependentupontheparametrisationofthebound-arycurvesandthemethodofassociatingpairsofpointsonthetwocurves.AruledsurfacewithB-splineboundarycurvescanhoweverbeexactlyrepresentedbytheB-splinesurfaceentity.2TopologyThefollowingarewithinthescopeofthetopologyschema:—definitionofthefundamentaltopologicalentitiesvertex,edge,andface,eachwithaspecialisedsubtypetoenableittobeassociatedwiththegeometryofapoint,curve,orsurface,respectively;—collectionsofthebasicentitiestoformtopologicalstructuresofpath,loopandshellandconstraintstoensuretheintegrityofthesestructures;—orientationoftopologicalentities.3GeometricShapeModelsThefollowingarewithinthescopeofthegeometricmodelschema:—datadescribingtheprecisegeometricformofthree-dimensionalsolidobjects;—constructivesolidgeometry(CSG)models;—CSGmodelsintwo-dimensionalspace;—definitionofCSGprimitivesandhalf-spaces;—creationofsolidmodelsbysweepingoperations;—manifoldboundaryrepresentation(B-rep)models;—constraintstoensuretheintegrityofB-repmodels;—surfacemodels;—wireframemodels;—geometricsets;—creationofareplicaofasolidmodelinanewlocation.ThefollowingareoutsidethescopeofthispartofISO10303:—non-manifoldboundaryrepresentationmodels;—spatialoccupancyformsofsolidmodels(suchasoctreemodels);—assembliesandmechanisms.
【中国标准分类号】:N18
【国际标准分类号】:35_240_50
【页数】:348P.;A4
【正文语种】:英语