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    25 August 2017, Volume 37 Issue 4 Previous Issue    Next Issue
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    Modelingandcontrolforaliquidfilledspacecraftwithflexibleappendagesincloseproximity
    WANG Shou-Zhe, LIU Hua-Qing, ZHANG Qing-Zhan, JIN Yong-Qiang, SHENG Ying-Hua
    2017, 37 (4):  1-9.  doi: 10.16708/j.cnki.1000-758X.2017.0041
    Abstract ( 891 )   PDF (8084KB) ( 1146 )   Save
    Incloseproximity,theservicingspacecraftisacomplexsystemwithrigidflexibleliquidcoupled,andtheliquidsloshingmodel,suchaspendulum,isn′tapplicable.Thedynamicsmodelingandcontrolofthisspacecraftwerestudied.Firstly,akindofnewliquidsloshingequivalentmechanicalmodelwasderivedbyvirtualworkprinciple,anditcouldbeappliedtothesituationoftriaxialthrust.Secondly,arelativepositionguidancevectorandarelativepositionerrorvectorweredefined,andarelativepositionerrordynamicsmodelwasderived.Thirdly,combiningtherelativepositionerrordynamicswiththerelativeattitude  dynamics,acoupledrelativeattitudeorbitdynamicsmodelwasestablished,whichwassuitablefortheprocessofcloseproximityinrendezvousanddocking.Themodelwasalsorigidflexibilityliquidcoupled.Finally,acontrollawbasedontheslidemodecontrolwasdesignedtoestimatetheunknownbutboundeddisturbances,systemuncertaintiesandmeasurementnoise.Theeffectivenessofthecontrollawwasvalidatedbynumericalsimulation.TheresultsofthesloshinginthesimulationagreewellwiththeFlow-3Dresults,whichindicatesthattheliquidsloshingequivalentmechanicalmodelisreasonable.
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    Studyonmotionplanningofvariablegeometrytrussduringmultibodymaneuvering
    DENG Ya, ZHANG Jin-Jiang
    2017, 37 (4):  10-17.  doi: 10.16708/j.cnki.1000-758X.2017.0045
    Abstract ( 786 )   PDF (3956KB) ( 1094 )   Save
    Mostofcurrentresearchesaboutvariablegeometrytruss(VGT)  motionplanningonlyfocusonthesituationthateachbayhassingledegreeoffreedom.MotionplanningofVGTwhoseeachbayarevariablemultiplelinkswereinvestigated.Kinematicmodelwassetupbasedonthegeometricalrelationship.Consideringmomentumconservationofthefreefloatingsystem,velocitykinematicmodelwasformulated.AmethodofdesigningmovingsequenceandmovingtimeseparatelywasproposedformotionplanningofsinglebayVGT.Additionally,multi-bayVGTmotionplanningproblemwassolvedbyenergyoptimum.Simulationresultsshowthatthealgorithmiseffective,andtheoptimizingindexis0.8798.ThemethodhaspracticalbenefitstothespaceoperationsystemwithVGT.
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    TransferorbitinitialdesignandanalysisforMarsexplorationmission
    YANG Bin, LI Shuang
    2017, 37 (4):  18-27.  doi: 10.16708/j.cnki.1000-758X.2017.0047
    Abstract ( 907 )   PDF (5191KB) ( 1405 )   Save
    AccordingtothepropulsionmodeandwhethertouseVenusgravity-assist,Marstransferorbitisdividedintofourtypes:theimpulsedirecttransferorbit,theimpulseVenus′gravity-assisttransferorbit,thelowthrustdirecttransferorbit,andthelow-thrust Venus′gravity-assisttransferorbit.InordertocomprehensivelyanalyzetheorbitcharacteristicsofthefourMarstransferstrategies,theenergyoptimaltransferorbitsforeverytransferorbitstrategyrespectivelyweredesigned.Inaddition,theorbitalcharacteristicsofdifferentMarstransferstrategieswereobtainedbynumericalsimulationandcomputation.Thebeneficialconclusionsweredrawnbasedonthecomparativeanalysisofthesimulationresults.Thelow-thrustMarstransfertrajectorydesignisnotrestrictedbylaunchwindows.ThelaunchwindowsopenalternatelyforimpulsedirecttransferandimpulseVenus′gravity-assisttransfer.Theenergyconsumptionoflow-thrustprobe,whichadoptsVenus′gravityassisttransferstrategy,isreducedby10%comparedwithdirecttransfer.TheeffectofVenusgravityassisttransferinenergyconsumptionisveryobvious.
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    Engineeringapplicationofmicrosatellite3-axisstablecontrolwithonlymagneticactuators
    YUAN Qin, KOU Yi-Min, JI Yan-Bo, LI Chun
    2017, 37 (4):  28-33.  doi: 10.16708/j.cnki.1000-758X.2017.0050
    Abstract ( 897 )   PDF (3982KB) ( 972 )   Save
    Toreducethecostandimprovethereliabilityofmicro-satellites,amethodwhichemployingmagnetictorquesastheonlyactuatorswasdevelopedtorealizethreeaxisstablecontrol.Thenbyusinglinearquadraticregulator(LQR)optimalcontroltheory,theinfinitetimestateregulatorandsteadygainregulatorweredesignedtostabilizemicro-satellitetonadirpointingusingfullymagnetictorques.Meanwhile,takingKaiTuo-1satellitein-orbitflightastheresearchobject,theproductofinertia,orbitinclination,residualmagnetismandaerodynamicdragdisturbancethatbringsdifferenteffectsforthecontrolprecisionwereanalyzed.SimulationresultsvalidateefficiencyandpracticabilityofLQRcontroller.Itcanachievehighcontrolprecisionunderlittledisturbance.
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    Satellitecontrolmethodforfastattitudemaneuverandstabilization
    FENG Jia-Jia
    2017, 37 (4):  34-40.  doi: 10.16708/j.cnki.1000-758X.2017.0058
    Abstract ( 1284 )   PDF (3340KB) ( 1059 )   Save
    Inviewofthesmallsatellitefastattitudemaneuver,  asatellitecontrolmethodforfastattitudemaneuverandstabilizationbasedonparticleswarmoptimization(PSO)  wasproposed.First,thismethoddoesthepathplanningwhichtheinitialpositionofparticlepopulationisasthefinishtimeforsatellitemaneuveraccelerationperiod;  theninthispathplanningthemaintenancetrackingcontrolwasusedfortracking,  andintheendofthemaneuverpath,thegoldensectioncontrolandlogicdifferentialcontrolwereusedtomakestabilitycontrol;  atlast,thetimeofsatelliteattitudemaneuvertotargetangleandstablewastakenasadaptivevaluetofindoutanoptimalpathintheconditionsofthiscombinedcontrolmethodandotherlimittoattitudemaneuverandstabilitycontrol.Thiscontrolmethodcandooptimalmaneuverandstabilitycontrolaccordingtotheactualdynamiccharacteristics,environmentalcharacteristicsoftheastral,constraintsandcontrolperformance.Applyingthismethodtothesmallsatelliteattitudecontrol,simulationresultsshowtheeffectivenessofthemethod.
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    ResearchoncalculationmethodofsignalinspaceuserrangeerrorforBeiDouNavigationSatelliteSystem
    LIU Rui-Hua, DONG Li-Yao, DI Xian
    2017, 37 (4):  41-48.  doi: 10.16708/j.cnki.1000-758X.2017.0055
    Abstract ( 855 )   PDF (3106KB) ( 1111 )   Save
    Accordingtothedefinitionofsignalinspaceuserrangeerror(URE)andtherootmeansquareURE(rmsURE)calculationmethodgivenintheGlobalPositioningSystemStandardPositioningServicePerformanceStandard(GPS-SPS-PS),theBeiDouNavigationSatelliteSystem(BDS)instantaneousURE(IURE)andrmsUREformulaswerededucedconsideringtheelevationconstrains.Inaddition,BDSUREwascalculatedbytheephemerisdata,andtheBDSreceiverrawobservations.Theresultsshowthatthetwomethodsmatchwell,andbotharelessthan2.5metersinthecaseof95%confidencewhichmeetsthebasicrequirementsofthesignalinspaceUREgivenintheBDSopenserviceperformancestandard(BDS-OS-PS).
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    Investigationfortraitsofmultiplefeedsperbeamantenna
    CHEN Xiu-Ji, WAN Ji-Xiang
    2017, 37 (4):  49-55.  doi: 10.16708/j.cnki.1000-758X.2017.0063
    Abstract ( 782 )   PDF (7533KB) ( 1393 )   Save
    Asaconfigurationthemultiplefeedsperbeamcaneffectivelyreducethenumberof  aperturesinmultiplecolorreusecondition.Becausethisconfigurationisresearchedintheprimarystageathomeandabroad,thetraitsofantennausingthiskindof   configurationneedtoberesearchedurgently.Thedesignrequirementsanddifferencesofthiskindofantennarelativetothesingle  feedperbeamantennawereresearched.Thenotionofthemaxinterferenceofneighborcocolorbeamswaspresentedasa  keypoint.Andinordertoensuretherealizabilityoffeednetworksintheory,adesigncombiningthefeednetworkswiththebeamoptimizationwaspresentedforthefirsttime.Finally,twopointsofideasforfurtherimprovementofbeams′propertiesweregiven,alongwithanalysisofthefeasibilityofthem.
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    Researchonquickstaridentificationalgorithmofupperstage
    LI Chao-Bing, LI Lan-Lan, WEN Ya
    2017, 37 (4):  56-62.  doi: 10.16708/j.cnki.1000-758X.2017.0053
    Abstract ( 783 )   PDF (4160KB) ( 1143 )   Save
    Presentstaridentificationalgorithmshavetheproblemofreal-timecalculation.Inordertomeetthenavigationrequirementoftheupperstage,theKvectorsearchalgorithmwasemployed,theinterstaranglesasthematchingfeaturequantitywereselectedandthestarpyramidmatchingalgorithmwasused.Finally,simulationresultsindicatethatthesuccessrateofthisalgorithmismorethan99%,themaximumtimeofidentificationisabout100ms,andtheaveragetimeislessthan15ms.Thealgorithmcanmeetthematchingspeedandprecisionrequirementsoftheupperstage.
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    Adaptiveactivevibrationcontrolmethodforcryocoolercompressorinspace
    NI Tian-Zhi, YANG Bao-Yu
    2017, 37 (4):  63-68.  doi: 10.16708/j.cnki.1000-758X.2017.0059
    Abstract ( 723 )   PDF (5379KB) ( 1120 )   Save
    Thevibrationofcryocoolercompressorisoneofthecriticalfactorduringtheapplicationinsensitiveinstruments.Compressorvibrationwillleadtoimagingblur,affectthepointingaccuracyandresolutionofthetarget,andevencausethemechanicalresonanceoftheplatform.Inordertoreducetheimpactofcryocoolervibrationonspacepayloadsensitivedevices,anadaptiveactivevibrationcontrolalgorithmbasedonadaptivenarrowbandnotchfilterwasadopted.Thealgorithmisindependentofthevibrationtransferfunctionmodelandisnotlimitedbytheapplicationenvironment.Theadaptivevibrationcontrolisrealizedbyadjustingtheamplitudeandphaseofthedrivingsignalconstantly.Thecontrolsystem,includingDSPcontrolsoftware,electroniccircuitandtransducer,wassetup,andtheexperimentprovedtheeffectivenessofthealgorithmwhichwasfirstusedtocompressorvibrationcontrol.Thefundamentalfrequencyvibrationofthecompressorhasreducedfrom0.166m/s2to0.014m/s2,byafactorof21.2dB.
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    Optimizationdesignofinclinationorbitofhumanlunarlandingemergencyreturntrajectory
    CHEN Hai-Peng, YU Xue-Hao, HUANG Fei
    2017, 37 (4):  69-74.  doi: 10.16708/j.cnki.1000-758X.2017.0057
    Abstract ( 644 )   PDF (4121KB) ( 1163 )   Save
    Formissionsofshorttermvisitstothemoon,thelunarascentstagerequirestheascendingmoduletoRendezvousanddock
    interfacewiththecabininnoncoplanarity.Asolutiontosolveforthechangeoftheangleofascentplane(referredtoaswedgeangle)  wasproposed,andwedgeangleoftheascendingorbitwasgivenbyusingthethreelinetheoremtoreducethedemandoftheemergencyreturntasktoreducetheworstplaneofthewholemissionperiod.Themethodofsolvingtheinclinationofthelandingtrackandtheascendingorbitwasgiven.Thesimulationresultsshowthattheproposedmethodissimpleandaccurate,providingreferenceforthedesignandanalysisofhumanlunarlanding.
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    Researchongammaraysirradiationresistancepropertiesoftransparentconductiveoxidethinfilms
    OUYANG Qi , WANG Wen-Wen, HAO Wei-Chang
    2017, 37 (4):  75-83.  doi: 10.16708/j.cnki.1000-758X.2017.0065
    Abstract ( 17 )   PDF (2177KB) ( 999 )   Save
    Tungstendopedindiumoxidethinfilms(In2O3: W,IWO)withgoodopticalandelectricalpropertieswerepreparedonglasssubstratesbyradiofrequency(RF)reactivemagnetronsputteringmethod.Tindopedindiumoxidethinfilms(In2O3:  Sn,ITO)werepurchasedindustrialproduction.Allthesefilmswereirradiatedbygammarayswithdifferentamountoffluxinagroundbasedsimulationsystemclosetotheenvironmentofdeepspace.Changesincharacteristicsincludingmicrostructure,surfacemorphology,chemicalstates,opticalandelectricalpropertieswerecomparedbetweenIWOandITOfilmsafterirradiation.Thevariationsofdefectsinfilmsbeforeandafterirradiationweremeasuredbypositronannihilationtechnique(PAT).Asaresult,oxygenvacancydefectswereemergedinITOandIWOfilmsafterirradiationespeciallyinthesurfacesandinterfaces.Itisindicatedthatgammarayshaveinfluenceontransparentconductiveoxidethinfilmsbyknockingchemicalbondswithlowerbindingenergyandproducingoxygenvacancies.Recombinationbetweendifferentelementsandoxygenmaybeselectivewhilechemicalstateskeepconstant.BothITOandIWOfilmspossesssuitableanti-gammaraysirradiationproperties.AndIWOfilmsaremoreappropriateasanti-gammaraysprotectivecoatingsindeepspaceexplorationthanITOfilms.
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