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ID:31584895
大小:6.79 MB
页数:158页
时间:2019-01-14
《挠性卫星姿态快速机动算法分析》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、哈尔滨工业大学工学硕士学位论文AbstractThecapabilityofrapidatttitudemaneuverisakeytechnologyoftoday'ssatellite,itrequiresthatthesatelliteonorbitcancompleteintheshortesttimetoadjusttheprocessofconvertingfromoneattitudetoanotherattitude.Comparedwiththeearlyspaceexploration,contempo
2、rarysatellitestructuresbecomemorecomplex.Inadditiontotherigidmainpart,thesatellitesalsohavetheflexibleattachmentofavarietyofpurposes.Fortherapidattitudemaneuverofflexiblesatellite,themaincontentsofthethesisareasfollows.Forthethree-axismaneuverrelativetotheinertial
3、frame,amethodbasedontheinputandoutput(I/O)feedbacklinearizationandcompositenonlinearfeedback(CNF)methodisproposedtocompletethelargeangleattitudemaneuvernearthespecifiedtimepointwithoutovershoot,namelyIO-CNFmethod.Firstlyquaternionandthemodalcoordinatesareasthestat
4、esofattitudeequationofthesystem.Anewsetofcoordinatesystembasedonhomeomorphismisgiven;Acontrolalgorithmcombinedwiththeclassicaltime-domainanalysisandCNFmethodisdesignedforfaststepresponsewithoutovershoot,andthedesignprinciplesoftherequiredparametersisgiven.Finally,
5、torqueisgivenbasedonthecontrolalgorithm,andproofisgivenforthethestabilityofthezerodynamicsnamelytheminimumphasetoensuretherigorandintegrityofthecontrollaw.Twokindsofmodeobserver(IandII)aredesignedfortheproblemsofmodalcoordinatesinpreviousresearchbeingdifficulttome
6、asure.Anewequationofstateisgivenusingtheangularvelocitythemodalcoordinateanditsderivativeasstates,torqueasaninputandangularvelocityastheoutpuforthedesignofmodalobserverI.Acompletesetofdesignprinciplesandstepsaregivenforflexiblesatellitemodalobserverparameterscombi
7、nedwiththesatellitemodelaccordingtoastateobserverdesignmethodbasedoninvariantsetsstability.ForthedesignofmodalobserverII,basedontheequationofstateontheoftheobserverI,anonlinearfunctionisgivenasthecombinedoffunctionsofmodalparametersandvariablesinthedifferentialequ
8、ationaboutangularvelocity.ObserverII,namelytheESOformofflexiblesatelliteattitudedynamicequationsisgivenbasedonextendedstateobserver(ESO)method.Forthepre
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