直升機飛行力學(xué)模型辨識研究.pdf

1、南京航空航天大學(xué)博士學(xué)位論文直升機飛行力學(xué)模型辨識研究姓名：孫濤申請學(xué)位級別：博士專業(yè)：飛行器設(shè)計指導(dǎo)教師：張呈林201006直升機飛行力學(xué)模型辨識研究iiABSTRACTModelingofhelicopterflightdynamicsisthefoundationofhelicopterflightcontrollerflightsimulatdevelopment.Thisthesissystemicallystudiesthe

2、iesmethodsofhelicopterflightdynamicsmodelidentification.concentratesonthreecrelativecontents:transcendentalinfmationacquisitionadoptionidentificationmethodsidentificationflightexperimenttechnology.Inthethesistheanalysiss

3、tudyaremainlybasedonsmallscaledsinglemainrothelicoptersomeconclusionsareextendedtothenmalhelicoptertosolvethecommonproblemsonhelicopters.Thisthesispaysattentiontotheutilizationofpriknowledgesuchasengineeringexperiencethe

4、eticalconclusionssoastomaketheresultscapableofdescribethehelicopterflightdynamicnaturescrectlyaswellasofclearphysicalmeaningeasytobeacceptedbyengineers.Firstlyindertogettheidentificationmodelgroupthethesisresearchestheac

5、tersofhelicopterflightdynamicsmodeleshelicopterflightdynamicsusingmechanismmodelingmethod.Thefcemomentsofthemainaerodynamiccomponentsareconsidered.Withthesefcesmomentsthethesisbuiltupthe6DOFmovementequationsofthehelicopt

6、er.Basedonthe6DOFequationstheflappingmotionsofmainrotBellHillerbararealsomodeledtoanalysetheinfluencetohelicopterresponse.Throughtheanalysisonhelicopterflightdynamicactersmechanismmodelthetranscendentalinfmationisacquire

7、dwhichisessentialftheidentificationresearchinthenextstep.Thehelicopterisamultiinputmultioutputnonlinearunstablesystemwithveryhighvibration.Theactersmaketheidentificationofhelicopterverydifficultsincetherearemanyproblemsd

8、uringidentificationmodeling.Aimingatsolvingtheseproblemsthesystemidentificationmethodisresearchedinthisthesis.Atwostepidentificationmethodisproposedwhichfirstlyidentifytheinitialmodelusingsubspaceidentificationmethodthen

9、identifytheoptimizedmodelusingfrequencyweightedpredictionerrmethod.Withthisidentificationmethodthisthesismakesthesimulationtoidentifytheexamplehelicopterflightdynamicsmodel.Theresultshowsthatthemethodisefficientaccurate.

10、Inthisthesisahelicopterflightdynamicidentificationexperimentsystemisdevelopindertocarryouttheflightexperimentsresearchtheproblemsencountered.Accdingtotherequirementsoftheexperimentthesubsystemsaredesigned.Meanwhilethenav