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计算机辅助设计(CAD)及计算机辅助设计制造系统_中英文翻译附录:puter-puterisusedtoanalyzevariousaspectsofadesignedproduct.TheCADsystemsupportsthedesignprocessatalllevels?conceptual,preliminary,andfinaldesign.Thedesigncanthentesttheproductinvariousenvironmentalconditions,suchastemperaturechanges,orunderdifferentmechanicalstress.putergraphics,thedisplayofthedesignedobjectonascreenisoneofthemostvaluablefeaturesofCADsystems.Thepictureoftheobjectisusuallydisplayedonthesurfaceofcathode-puterscreen,separatingitintosegments,enlargingaspecificportionoftheobjectinordertoobserveitindetail,andstudyingthemotionofmechanismswiththeaidofprograms.MostCADsystemsareusinginteractivegraphicssystem.puterinordertogeneratemanipulate,andmodifygraphicdisplays.eavaluabletool,ifnotanecessaryprerequisite,ofCADsystem.puter.OneofthemostdifficultproblemsinCADdrawingistheeliminationofhiddenlines.puterproducesthedrawingaswireframediagram.puterdefinestheobjectwithoutregardtoone’sperspective,itwilldisplayalltheobject’ssurfaces,regardlessofwhethertheyarelocatedonthesidefacingtheviewerorontheback,whichnormallytheeyecannotsee.puterscreen.Onemethodistouseageometricmodelingapproach,inwhichfundamentalshapesandbasicelementsareusedtobuildthedrawing.Thelengthsandradiioftheelementscanbemodified.Forexample,acylinderisabasicelement,thesubtractionofacylinderwithaspecificradiusandlengthwillcreateholeinthedisplayedpart.Eachvariation,however,maintainstheoverallgeometryofthepart.OtherCADsystemsusegrouptechnologyinthedesignofparts.Grouptechnologyisamethodofcodingandgroupingpartsonthebasisofsimilaritiesinfunctionorstructureorinthewaystheyareproduced.panytoreducethenumberofpartsinuseandtomaketheproductionofpartsandtheirmovementintheplantefficient.RecentlyCADsystemsareusingthefinite-elementmethodFEMofstressanalysis.Bythisapproachtheobjecttobeanalyzedisrepresentedbyamodelconsistingofsmallelements,eachofwhichhasstressanddeflectioncharacteristics.Theanalysisrequiresthesimultaneoussolutionofmanyequations;puter,puterscreenbygeneratinganimationofthemodel.Wi
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计算机辅助设计的中英文 计算机辅助设计（cad）及计算机辅助设计制造系统 中英文翻译.doc...
