Nastran 尺寸优化 Sizing Optimization

《Nastran 尺寸优化 Sizing Optimization》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、34SizingOptimization4.1-1BASICA4.1NALYSISRedundantTrussModel4.1-2RedundantTrussModelRedundantTrussModel4.1-3ModelDescription:TodemonstratesomeofthecapabilitiesofthesizingoptimizationsolutionsequencewithinMSC/NASTRANasimpleredundanttrussstructurewillbeoptimized.BASICSta

2、rtMSC/NASTRANforWindowsandgointoanewmodel.Thefirsttaskbeforeaddressingtheoptimizationmodelsetupistobuildthefiniteelement(FE)model.FollowtheinstructionsbelowAtobuildthesimpletrussmodelusingrodelements.NALYSIS4.1-4RedundantTrussModelExerciseProcedure:1.StartMSC/NASTRANfo

3、rWindows3.0.2bydouble-clickingontheMSC/NASTRANforWindowsicon.Forthisexercise,youwillselecttheNewModeloption.OpenModelFile:NewModel2.Createthemodel.Model/Node...X:0Y:0Z:0OKX:10Y:0Z:0OKX:10Y:10Z:0OKX:0Y:10Z:0OKCancelView/Autoscale(Ctrl+A)3.Createamaterialproperty.Model/M

4、aterial...Load...LibraryEntry:AISI4340SteelOKRedundantTrussModel4.1-5BASICANALYSISOKCancel4.Createfiverodproperties,eachreferencingtheabovematerial.Model/Property...Elem/PropertyType...LineElements:●RodOKTitle:Rod1Material:1..AISI4340SteelArea,A:0.1OKRepeatforthesecond

5、rod.ID:2Title:Rod2Area,A:0.1OKREPEATagainforID=3,4and5,withrespecttoRod3,4and5,allusingthesamearea.4.1-6RedundantTrussModelEachrodelementthatwillbecreatedwillreferenceitsownproperty.Thisallowseachpropertytovaryindependentlyduringtheoptimizationanalysis.OKCancel5.Create

6、thefiverodelements,eachreferencingitsownrodpropertyandconnectthemasshownbelow:Model/Element...Property:1..Rod1Nodes:12OKProperty:2..Rod2Nodes:23OKProperty:3..Rod3Nodes:34OKProperty:4..Rod4Nodes:13OKProperty:5..Rod5Nodes:42RedundantTrussModel4.1-7BASICANALYSISOKCancelVi

7、ew/Options...QuickOptions...LabelsOnDoneOKYourmodelshouldnowlooksimilartothefollowingfigure.Notethatthetwodiagonalrods4and5donotjoinatthecenter.6.Nowdefinetheconstraints.Model/Constraint/Nodal...Title:FixedPointsOK4.1-8RedundantTrussModelPickNodes1and4fromthegraphicssc

8、reen.OKFixedOKCancel7.Applytheload.Model/Load/Nodal...Title:VerticalLoadOKPickNode2fromthegraphicsscreen.OKHighlightF