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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 ( 1095 )   PDF (8084KB) ( 1272 )   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. Related Articles | Metrics

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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 ( 995 )   PDF (3956KB) ( 1318 )   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. Related Articles | Metrics

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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 ( 1273 )   PDF (5191KB) ( 2185 )   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. Related Articles | Metrics

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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 ( 1232 )   PDF (3982KB) ( 1311 )   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. Related Articles | Metrics

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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 ( 1464 )   PDF (3340KB) ( 1350 )   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. Related Articles | Metrics

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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 ( 1223 )   PDF (3106KB) ( 1846 )   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). Related Articles | Metrics

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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 ( 1001 )   PDF (7533KB) ( 1653 )   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. Related Articles | Metrics

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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 ( 994 )   PDF (4160KB) ( 1376 )   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. Related Articles | Metrics

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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 ( 1314 )   PDF (5379KB) ( 1465 )   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. Related Articles | Metrics

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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 ( 853 )   PDF (4121KB) ( 1628 )   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. Related Articles | Metrics

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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 ( 230 )   PDF (2177KB) ( 1333 )   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. Related Articles | Metrics