applications of computational methods for dynamic stability and control derivatives nasa aiaa 2004 0377外語英文電子書

applications of computational methods for dynamic stability and control derivatives nasa aiaa 2004 0377外語英文電子書

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頁數(shù)：16頁

時間：2018-03-02

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1、AIAA2004-0377APPLICATIONSOFCOMPUTATIONALMETHODSFORDYNAMICSTABILITYANDCONTROLDERIVATIVES*LawrenceL.GreenNASALangleyResearchCenter,Hampton,VA**AngelaM.SpenceMississippiStateUniversity,MississippiState,MSABSTRACTBecauseoftheirdynamiccapabilities,theseS&CInitialstepsintheapplicationof

2、alow-orderfacilitiesmaybeexpensivetobuild,operate,and/orpanelmethodcomputationalfluiddynamics(CFD)maintain.Therangeofmotionsthatcanbeperformedcodetothecalculationofaircraftdynamicstabilityandinsuchfacilitiesmaybelimitedbythewindtunnelcontrol(S&C)derivativesaredocumented.Severalwal

3、lsorbythetestrig’skinematicandvibrationalcapabilities,uniquetoCFDbutnotuniquetothisrestrictions.Inaddition,manyconventionaldynamicparticulardemonstration,areidentifiedandtestfacilitiesdonotprovidethecapabilitytodeterminedemonstratedinthispaper.Theseuniquecapabilitiesdampingandcros

4、sderivativesindividually;instead,complementconventionalS&Ctechniquesandtheythesefacilitiescanonlyprovidemeasurementsof9includetheabilityto:1)performmaneuverswithoutcombinedderivatives.Themeasurementofthesetheflow/kinematicrestrictionsandsupportinterferencequantitiesinpairsisnotthe

5、preferredsituation;itiscommonlyassociatedwithexperimentalS&Csimplyakinematicrealityofthefacilitiesavailable.A10facilities,2)easilysimulateadvancedS&Ctestingcompanionpaperdetailsseveralcomputationaltechniques,3)computeexactS&Cderivativeswithtechniquestoseparatesuchpaireddynamicderi

6、vatives.uncertaintypropagationbounds,and4)altertheflowSomefacilitiesarenotequippedwitha“slipring”physicsassociatedwithaparticulartestingtechniquecapabilityandthus,cannotperformcontinuousrotaryfromthoseobservedinawindorwatertunneltestinmotions;insteadtheyrelyonoscillatorymotionstoo

7、rdertoisolateeffects.Alsopresentedarediscussionsprovidebriefperiodsofsteadyrotationalmotion.aboutsomecomputationalissuesassociatedwiththeThedifficultyofmanyexperimentalS&CsimulationofS&Ctestsandselectedresultsfromfacilitiestoadequatelymodeltheflightcharacteristicsnumeroussurfacegr

8、idresolutionstudiesperformedoftod

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