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    25 June 2015, Volume 35 Issue 3 Previous Issue    Next Issue
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    Modeling and Controlling for Servicing Spacecraft Approaching a Tumbling target in Close Proximity
    2015, 35 (3):  1.  doi: 10.3780/j.issn.1000-758X.2015.03.001
    Abstract ( 1029 )   PDF (981KB) ( 1157 )   Save
    Toinsurethesafetyofautonomousapproachinganddockingofatumblingtargetinonorbitservicingmissions,thedynamicsandcontrolforservicingspacecraftapproachingincloseproximitywasresearched.Byintroducingthedesiredrelativepositionvectorandthepositionerrorvector,whichfiguredtherelativemotionconfiguration,anovelrelativepositiondynamicmodelwasderived.Consideringtheinstallationlocationanderrorsofdockingmechanisms,thecoupledrelativepositionandattitudedynamicmodelofapproachingwasestablished.Themotionlawofthedesiredrelativepositionvectorwasdesignedundertheconstraintofapproachingpath.Basedontheintegratedcoupleddynamicmodelandconsideringunknownboundaryinterferences,theadaptivetimevaryingslidingmodecontrollawwasproposed,andthecloseloopsystemwasprovedtobesteadybyusingoftheLyapunovstabilitytheory.Simulationresultsshowthattheapproachofdesigningthedesiredrelativepositionvectorcancontroltheconfigurationchangesoftherelativemotion,andtheadaptivetimevaryingslidingmodecontrollawachievesacomparativelyhighprecision.Andthecoupledmodelandthecontrollawareeffectivewithperfectperformance.
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    DesignonIGSOConstellationwithSimpleSolarArrayPointingStrategy
    JINGYaoxiang,HOUFen,TONGJincheng
    2015, 35 (3):  10.  doi: 10.3780/j.issn.1000-758X.2015.03.002
    Abstract ( 841 )   PDF (955KB) ( 869 )   Save
    BasedontheGEOsatellites,anespecialIGSOconstellationwaspresentedfortheglobaltelecommunicationconstellation.Toreducethecomplexityandthecostofthesatellitedevelopment,thecontrolmodewhichtheGEOsatelliteadoptedtocontrolthesolararrays′pointingwasusedinthisIGSOconstellation.SimulationresultsshowthatthiskindofIGSOconstellationnotonlycanrealizemonooverlayorpolaroverlay,butalsocanachieve95%oftheglobaltelecommunicationoverlaybyonly3IGSOsatellitesassociatedwith3GEOsatellites.
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    ADoublelayeredSatelliteConstellationNetworkRoutingAlgorithmBasedonEquallengthIntervalSnapshots
    ZHANGJingbin,LIUJiong,SHENPubing
    2015, 35 (3):  17.  doi: 10.3780/j.issn.1000-758X.2015.03.003
    Abstract ( 827 )   PDF (1798KB) ( 1239 )   Save
    Forthesatelliteconstellationnetwork,changesinrealtimeofnetworktopologyandfrequentlyhandoverofISLhavebadimpactsontheroutingperformance.Basedonthebackboneandaccessionstheoryandtheweakconnectiontheory,anewdoublelayeredsatelliteconstellationnetworkstructurewasproposed,whichcanhelptheadministrationforeachlayer.Moreover,anewroutingalgorithm,namedEDRA,wasproposed.Theroutingalgorithmimprovesthemethodofequallengthintervalsnapshotsbyadjustingthepolarboundarydynamicallyandadoptingthenewideaoflayeredmanagement.Theanalysisandsimulationsshowthatthenewsatelliteconstellationnetworkstructureismoresensible,thenumberofsnapshotsoftheEDRAalgorithmisonlythehalfoftheVLRAalgorithm,andtheaveragedurationofsnapshotsismorethanthreetimesoftheVLRAalgorithm.TheEDRAalgorithmcanreducethenumberofcalculationandupdatingoftherouting,improvetheutilizationofnetworkISL,reducethedelayjitterandpacketlossrate.
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    TrajectoryOptimizationofElectricSailBasedonParticleSwarmAlgorithm
    WANGYu,WEIYanming,LIYong,YUYang,BIANBingxiu
    2015, 35 (3):  26.  doi: 10.3780/j.issn.1000-758X.2015.03.004
    Abstract ( 842 )   PDF (904KB) ( 682 )   Save
    Theelectricsailisaninnovativenonpropellantpropulsioninspacewhichtakesadvantageof
    themomentumofthesolarwind.Theminimumtimeinterplanetarytransferproblemoftheelectricsailwasstudied.ThemissionscenariosabouttransferringfromtheEarthtotheMarsandVenuswereinvestigated,usingacontinuoussteeringlawmodel,inapolarinertialframe.Twodirectmethodsbasedontheparticleswarmoptimization(PSO)algorithmwereproposed,whichavoidedsolvingthetwopointboundaryvalueproblem(TPBVP)whichwassensitivetotheinitialvalueofthecostatevariables.Thefirstmethodusedtheshootingmethodtodiscretizedthecontrolvariables,transformingtheoptimalcontrolproblemintoaparameteroptimizationproblemofnonlinearpropramming.BasedonthePSOalgorithm,thenearoptimaltransfertrajectorywasobtained.Thesecondmethodfocusedonthecharacteristicsthatallthecontinuouscontrollawscanbefittedusingthepolynomialfunctionundercertainprecision.Acontrollawwasdesignedtoapproximatetheoptimaltransfertrajectorybasedontheanalysisoftheresultsfromthefirstmethod,andthePSOalgorithmwasusedtooptimizetheparametersofthedesignedcontrollaw.Thesimulationresultsshowthatbothmethodshavetheadvantagesoftherandominitialvariableselection,largeconvergencerangeandgoodrobustness.
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    GEOObjectsSurveillanceandTrackingModeofSpace-basedOpticalSystem
    ZHOUMeijiang,ZHUZhencai,YANGGenqing,WUHuiying,HUHaiying,ZHANGShengyu
    2015, 35 (3):  35.  doi: 10.3780/j.issn.1000-758X.2015.03.005
    Abstract ( 1635 )   PDF (1250KB) ( 1168 )   Save
    Currently,themostcommonlyusedpatterninspacetargetobservationofspacebasedopticalsystemisnaturalintersectionmodewhichneedsalongcoverageperiod,andtheeffectofatmosphereradiationoftheearthonspacetargetobservationisnotestimated.Basedonthecharacteristicsofspacebasedplatformsonsunsynchronousorbit,severalobservationmodesforGEOtargetswereplannedandanalyzed,transformingtheeffectofatmosphereradiationofearthonspacetargetobservationintoacameraoffaxisangleconstraints,whichisvaluableforengineeringapplication.Theobservationefficiencywasevaluatedfromseveralaspectssuchasattitudemodes,coveragetimeandobservingarc.BoththeoreticalanalysisandsimulationresultsshowthattheregionalstaringmodehasabigadvantageforGEOobjectobservation.Thecoveragetimeislessthan24hours,whiletheattitudemodeiscomparativelysimple,andtheobservingarcislonger.
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    NumericalSimulationofElectrolyteMovinginNickelHydrogenBatteryofSatellite
    ZHOUZhicheng,LIFeng,HUANGHua,XUHangyan,TANLixin
    2015, 35 (3):  44.  doi: 10.3780/j.issn.1000-758X.2015.03.006
    Abstract ( 928 )   PDF (2221KB) ( 953 )   Save
    Athreedimensionalnumericalmodelofanindividualpressurevesselwasdevelopedbasedonthe80AhnickelhydrogenbatteryusedforGEOcommunicationsatellites.Themodel,includingthemaincomponentsofabatteryincludingthebatteryshellandelectrodestack,wasutilizedtosimulatethetransientflowfieldoftheelectrolyteunderzerogravitycondition,byusingthecomputationalfluiddynamics(CFD)technology.Thecomparisonsofthesimulationresultswithdifferentboundaryconditionsshowthattheflowvelocityoftheelectrolytefromshelltotheelectrodestackwasdecidedbythewettabilityoftheelectrolyte.Addingroutesfortheelectrolyteflowingfromthebottomacmeandtheupperacmetotheelectrodestackcanimprovetheperformanceofthenickelhydrogenbattery.
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    ModelingandAnalysisofCabinAtmosphericEnvironmentalControlSysteminaMannedSpacecraft
    LIUWei,CHENLiping,DINGJianwan,XIEGang
    2015, 35 (3):  50.  doi: 10.3780/j.issn.1000-758X.2015.03.007
    Abstract ( 935 )   PDF (1119KB) ( 809 )   Save
    Thegoverningequationsofcomponentsforcabinatmosphericenvironmentalcontrolsysteminmannedspacecraftwerebuilt.ThegeneralmethodofestablishingmodellibraryusingmultidomainunifiedmodelingmethodbasedonModelicawaspresented.Apowerfullibrarywithhighreusability,extensibilityandfeasibilitywasbuiltfortheenvironmentalcontrolsystem.Akindofenvironmentalcontrolsystemincludinganatmospherecontrolandsupplysubsystem(ACSS),atmosphererevitalizationsubsystem(ARS)andatemperatureandhumiditycontrolsubsystem(THCS)wasmodeledtocarryouttheperformanceanalysisandthecontrolstrategystudy.Theinvestigationshowsthatthreesubsystemsarecoupleddeeplyandhaveinfluenceoneachother.TheactivetemperaturecontrolmethodisappropriateforTHCS.Andabettercontrolstrategyofactivetemperatureandhumiditycontrolwasputforwardtoachievemoreeffectivecontrolcapability.Thecrewactivitylevelshouldbeconsideredasavariation,whichhasheavyeffectsonothersubsystems.Theestablishedmodellibraryandanalysisresultsprovideanefficientwaytoimprovethedesignandrunningmanagementofthecabinenvironmentalcontrolsysteminthemannedspacecraft.
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    YANRongxin,SUNWei,LIWeidan
    2015, 35 (3):  58.  doi: 10.3780/j.issn.1000-758X.2015.03.008
    Abstract ( 1117 )   PDF (1034KB) ( 942 )   Save
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    HUANGLiangwei,SHUAIPing,LINQingqing,ZHANGXinyuan
    2015, 35 (3):  66.  doi: 10.3780/j.issn.1000-758X.2015.03.009
    Abstract ( 1028 )   PDF (799KB) ( 1192 )   Save
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