R12-08-parametrics+optimization

©2007ANSYS,Inc.Allrightsreserved.401ANSYS,Inc.ProprietaryParametricsandOptimization©2007ANSYS,Inc.Allrightsreserved.402ANSYS,Inc.ProprietaryOutline•ParametricStudies:–Introduction–Definingaparameter•Booleanparameters•Radio-buttonparameters–Settingparametricvalues–Selectingandcheckingtrialsandchoosingre-startoptions–Fasttrials–Solvingtrials–Reporting•Optimization:–Introduction–Defining/settingdesignvariablesandconstraints–Definingfunctions–Solvingtrials–Reporting©2007ANSYS,Inc.Allrightsreserved.403ANSYS,Inc.ProprietaryIntroductionSinglelocation–Solution/RunOptimization•Cantogglebetweensingletrials,parametrictrials,andchoosewhatrunstoperform.•Cancontrolbasicsolversettings–Radiationonoroff–Retentionofformfactors–Fasttrials•Optimizationalgorithm–Gradient-basedmethod–Upto50designvariables–Upto10constraintfunctions©2007ANSYS,Inc.Allrightsreserved.404ANSYS,Inc.Proprietary$Height$Power$ZC$ZS$ZOTrial1:OriginalconfigurationTrial2:PowerdissipatedbycylinderreducedIntroduction•Parametriccapabilitiesallowautomatedcomputationsofnumerouscases.Theyprovideawaytoquicklyanalyzeanentiredesignspacequicklyandefficiently.•Parameterscanbeassignedtoalmostanything!–Positionalinformation,materialpropertiesand/orboundaryconditions–Commonsetting(e.g.dimensionsharedbymanyobjects)•Parameterscantakevaluesthatare:–Numeric–0.10.2etc..–Stringconstants–“al-commercial”“dural”etc…–Equations–(($yht+0.1)*0.2)•Nowhitespace•Andcanbe:–Asinglevalue–Multi-valuedforuseintrials,delimitedbyaspace•e.g.0.10.050.3©2007ANSYS,Inc.Allrightsreserved.405ANSYS,Inc.ProprietaryDefiningaparameter•Parameterscanbedefinedduringmodelcreation•Enter$nameinthetextfieldinsteadofanumericvalue.•Aparametermustbeprefixedbya“$”•Iftheparameterisrelatedtothegeometryofamodel,Icepakwillpromptyouforaninitialvalue•Iftheparameterisnotrelatedtogeometryaninitialvalueof0isassumed–Changetorequiredvaluebeforesolvingeitherusing•ProblemSetup/Parameters•Solution/EditParams•Re-defineoraddadditionalvaluesusing–Solve/RunOptimizationpanel•Characterssuchas-,‘and#shouldnotbeusedinthenameofaparameter©2007ANSYS,Inc.Allrightsreserved.406ANSYS,Inc.ProprietaryBooleanparameters•Booleanparameterscanbedefinedforanycheckbox•Basedontextfieldorexpressions•Canparametricallyspecifyobjecttobeactive/inactive–RightclickonActivecheckbutton–Activestateissetwithasinglelogicstatement–Textstringiscomparedtoobjectname–Expression•ONiftrue•OFFiffalse•CansimilarlyspecifyBooleanparametersforallothercheckboxes(eq.Fanfailure,radiation,gravity)•IfaBooleanparameterhasbeenappliedtheActivecheckwidgetturnsgreen©2007ANSYS,Inc.Allrightsreserved.407ANSYS,Inc.ProprietaryRadiobuttonparameters•Radiobuttonparameterscanbedefinedtoparametricallyspecifyoneofmanyoptions–rightclickononeoftheoptions•Forexample,canspecifythefollowingoptionsasparameters–Laminar/Turbulent–Radiation(Problemsetuppanel)–Steady-state/Transient•Parameterisdefinedusingexpressions–Valueisoneofmanyoptionsspecified©2007ANSYS,Inc.Allrightsreserved.408ANSYS,Inc.ProprietarySettingvalues•Parameters(designvariables)canbemodifiedbyusingtheParametersandOptimizationpanelbranch•Variableslistedintreeformat–Addormodifyexistingvalues•Discreteentries(separatedbyspaces)•Rangeandincrement–Definenewparametersandassignvalues–Possibletoselectvariableby“columns”–Deletesingleparameterorallparameters•Simplearithmeticoperationsadd,subtract,divide,multiply,trig,canbeperformedonparametersand/ornumericinputs–Note:•No“whitespace”inexpression•Icepakwillevaluatetheexpression•regardlessofunits•Limitedlogicalexpressionsarealsoallowed.©2007ANSYS,Inc.Allrightsreserved.409ANSYS,Inc.ProprietarySelectingtrialsAllcheckedtrialswillbesolved–unchecktoexcludeSetbutton•Appliesthecombinationofparametervaluesinthatrowtothemodel•UsefultocheckthedifferenttrialsinamodelRestarttrialID•Eachparametrictrialisrestartedfromtheprevioustrialsolutionbydefaultusinginterpolatedrestart•TorestartfromadifferentsolutionentertherequiredsolutionIDintheRestarttrialIDcolumn©2007ANSYS,Inc.Allrightsreserved.410ANSYS,Inc.ProprietaryAllcheckedtrialswillbesolved–unchecktoexcludeSelectingtrials©2007ANSYS,Inc.Allrightsreserved.411ANSYS,Inc.ProprietarySolvingtrialsfromparameters•FromtheParametersandoptimizationpanelyoucanruntheselectedtrials•Asingletrial(current),multipletrialsoroptimizationcanberunfromthepanel•IfparametrictrialsarerunIcepakwillsolveeachtrialinturnfromthoseselected•FastTrialscanbeperformed•Othersolutionparameterscanalsobesetinthepanel©2007ANSYS,Inc.Allrightsreserved.412ANSYS,Inc.ProprietarySolvingtrialsfromrunsolution•FromtheRunSolutionform,youcanchoosetoeitherrunjustthecurrentmodel,orperformmultipletrials•Icepakwillsolveeachtrialinturnfromthoseselected•Trialscanberunconcurrentlyiflicensesareavailable•FastTrialscanbeperformed•Therearealsoadditionalpost-processingtoolsthatallowyoutocomparethevarioussolutionsgraphically•Ifthemodelislarge,andaconsiderablenumberoftrialsaretobeperformed,thenitisadvisablenottogeneratereports(overview,ortemplate)duringthesolutionprocessasthiscancausememoryproblems.©2007ANSYS,Inc.Allrightsreserved.413AN