CAD And CAM 计算机辅助设计(CAD)和计算机辅助制造(CAM) 外文翻译.doc

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1、CADAndCAMThetermCAD/CAMisashorteningofComputer-AidedDesign(CAD)andComputer-AidedManufacturing(CAM).Wellthen,whatisageneralCADsystem?ThegeneralCADsystemwasdevelopedbyconsideringawiderangeofJ17—/717)z让12345tn(((((Iusesofsuchasystem.Thefollowingwereconsideredindetail:Mechan

2、icalengineeringdesign;Buildingdesign;Structuralengineeringdesign;Electroniccircuitdesign;Animationandwaspostulatedoccurred,tovariousPureanalysisgraphicdesign.thatfourbasicprocessesinvolvinggraphicsdegrees,ineachfield,namely:一standarddesignandanalysisprocesses.(2)Puredraughtin

3、g-productionofadrawingorpicturebythemanualcreationandmanipulationoflines,arcs,etc.(3)Drawingbyanalysis-theproductionofapictureorpartofapicturedirectlyfromanalysis:forexample,productionofcamprofiles.(4)Analysisofdrawing-evaluationofthepropertiesofanitemdescribedgraphically,for

4、exampletheproductionofaquantitylistbyanalysisofabuilder"splandrawing.Forthesystemtobeabletosupportpureanalysisitmustcontainfacilitiesfortherunningofanalysisprogramsofunlimitedlengthandforthestorageandrapidretrievalof1argeamountsofdata.Ttwasconsideredimportantthattheusershould

5、beabletocommunicatedirectlyandgraphicallywithanalysisprograms.Graphicsfacilitieswereprovidedwhichwereconsideredtobesufficientforageneraldesigndraughtingsystem.However,therangeofgraphicalconstructiontechniquesissolargeinpracticethatthesystemcontainedonlyasmanyfaci1itiesascould

6、practicallybeincorporatedinthedraughtingsystem，leavingothermorespecializedtechniquestobedevelopedbytheapplicationsprogrammer.Forboththeproductionofdrawingitemsbyanalysisandtheanalysisofdrawings,itisessentialthatthereisasimpleefficient1inkbetweendataproducedbythedraughtingsyst

7、emandanalysisprograms.Ttisalsoessentialthatgraphicdatacanbeannotatedinawaywhichisrecognizedbyanalysisprogramsbutwhichdoesnotaffectthedraughtingsystem.Itwasthoughtthatformostpracticalapplicationthegeneraldraughtingsystemwouldbeincorporatedinamuch1argerspecificappiicationssyste

8、m.Forthisreasonthedraughtingsystemwasassimpleaspossibleconsistentwit