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ID:40058353
大小:3.90 MB
页数:126页
时间:2019-07-18
《Designing Active Control Laws in a Computational Aeroelasticity(PhD)》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、DesigningActiveControlLawsinaComputationalAeroelasticityEnvironmentJerryR.NewsomDissertationsubmittedtotheFacultyoftheVirginiaPolytechnicInstituteandStateUniversityinpartialfulfillmentoftherequirementforthedegreeofDoctorofPhilosophyinMechanicalEngineeringDr.HarryS.Robertsh
2、aw,Co-ChairDr.RakeshK.Kapania,Co-ChairDr.MichaelW.HyerDr.DanielJ.InmanDr.DonaldJ.LeoApril11,2002Blacksburg,VirginiaKeywords:Aeroelasticity,ComputationalFluidDynamics,FlutterActiveControlsDesigningActiveControlLawsinaComputationalAeroelasticityEnvironmentJerryR.Newsom(ABSTR
3、ACT)Thepurposeofthisdissertationistodevelopamethodologyfordesigningactivecontrollawsinacomputationalaeroelasticityenvironment.Themethodologyinvolvesemployingasystemsidentificationtechniquetodevelopanexplicitstate-spacemodelforcontrollawdesignfromtheoutputofacomputationalae
4、roelasticitycode.Theparticularcomputationalaeroelasticitycodeemployedinthisdissertationsolvesthetransonicsmalldisturbanceequationusingatime-accurate,finite-differencescheme.Linearstructuraldynamicsequationsareintegratedsimultaneouslywiththecomputationalfluiddynamicsequatio
5、nstodeterminethetimeresponsesofthestructuraloutputs.ThesestructuraloutputsareemployedastheinputtoamodernsystemsidentificationtechniquethatdeterminestheMarkovparametersofan“equivalentlinearsystem”.Theeigensystemrealizationalgorithmisthenemployedtodevelopanexplicitstate-spac
6、emodeloftheequivalentlinearsystem.Althoughtherearemanycontrollawdesigntechniquesavailable,thestandardLinearQuadraticGuassiantechniqueisemployedinthisdissertation.Thecomputationalaeroelasticitycodeismodifiedtoacceptcontrollawsandperformclosed-loopsimulations.Fluttercontrolo
7、farectangularwingmodelischosentodemonstratethemethodology.Variouscasesareusedtoillustratetheusefulnessofthemethodologyasthenonlinearityofthecomputationalfluiddynamicssystemisincreasedthroughincreasedangle-of-attackchanges.DedicationTomywife,Ellen,thankyouandIloveyou.iiiAck
8、nowledgementsFirst,IwanttothanktheNASALaRCforgivingmethetimeandsupporttoconductthisresear
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