资源描述：
《Aeroservoelasity of B-2 Bomber》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、JOURNALOFAIRCRAFTVol.37,No.5,September–October2000AeroservoelasticAnalysisoftheB-2BomberRobertT.Britt,¤StevenB.Jacobson,†andThomasD.Arthurs‡NorthropGrummanCorporation,PicoRivera,California90660IntheearlystagesofthedevelopmentoftheB-2bomber,thetechnicalchallengesposedbytheaeroelasticcharacteris
2、ticsoftheall-wingaircraftwererecognized.Theconguration’snear-neutralpitchstabilityandlightwingloadingmadetheaircrafthighlyresponsivetoatmosphericturbulence.Thisdictatedtherequirementforanactivedigitalightcontrolsystemtoprovidebothstabilityaugmentationandgustloadalleviation.Thegustloadalleviati
3、onightcontrolsystemwasdesignedbyamultidisciplinaryteamusingacombinationofoptimalandclassicalcontroldesigntechniques.Theanalyticalmodelsincludedlinearizedapproximationsofthedigitalcontrollawmechanization.Flight-testdataanalysisincludedtheextractionofthevehicleopen-loopresponse,whichcomparedwell
4、withtheanalyticalpredictions.Themultidisciplinarydesignapproachresultedinthesuc-cessfuldevelopmentofacontrolaugmentationsystemthatprovidestheB-2withsuperbhandlingcharacteristics,acceptablelow-altituderidequality,andsubstantialalleviationofgustloadsontheairframe.NomenclatureGLAdesignandvericati
5、onofGLAperformancewithrespecttoA(k)=generalizedaerodynamicmatrixstructuralloadsandaeroservoelasticstability.AcommonanalyticalBMi=bendingmomentresponseatithstationmodeldatabasewasutilizedbyalldisciplinestoensureconsistent,c¯=Meanaerodynamicchord,ftadequateperformanceforthenaldesign.Thispaperdis
6、cussesel-j=squarerootof(¡1)ementsofmodeldevelopment,methodologiesusedtodesignthek=reducedfrequency,c¯£x/2£VGLAcontrolsystem,andanalysesusedtodenegustdesignloadq=pitchraterequirementsandverifyaeroservoelasticstability.Flight-testresultss=Laplacevariable,j£xthatvalidatedthenalsystemdesignarealso
7、discussed.V=velocity,ft/sz=plungegeneralizedcoordinateB-2Overviewdi=controlsurfacepositionsTheB-2isanall-wing,high-subsonicaircraftthatutilizesthreegi=ithelasticgeneralizedcoordinatesetsofelevonsforcombinedpitchandrollcontrol,acenterlin
