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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 ( 1203 )   PDF (981KB) ( 1330 )   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. Related Articles | Metrics

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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 ( 1042 )   PDF (955KB) ( 1067 )   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. Related Articles | Metrics

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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 ( 1000 )   PDF (1798KB) ( 1446 )   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. Related Articles | Metrics

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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 ( 1061 )   PDF (904KB) ( 884 )   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. Related Articles | Metrics

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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 ( 1873 )   PDF (1250KB) ( 1547 )   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. Related Articles | Metrics

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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 ( 1104 )   PDF (2221KB) ( 1236 )   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. Related Articles | Metrics

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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 ( 1186 )   PDF (1119KB) ( 1007 )   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. References | Related Articles | Metrics

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null YANRongxin,SUNWei,LIWeidan 2015, 35 (3):  58.  doi: 10.3780/j.issn.1000-758X.2015.03.008 Abstract ( 1391 )   PDF (1034KB) ( 1103 )   Save null References | Related Articles | Metrics

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null HUANGLiangwei,SHUAIPing,LINQingqing,ZHANGXinyuan 2015, 35 (3):  66.  doi: 10.3780/j.issn.1000-758X.2015.03.009 Abstract ( 1180 )   PDF (799KB) ( 1577 )   Save null References | Related Articles | Metrics

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AdaptiveCooperativeControlforSatellitesFormationFlyingUsingVirtualStructure 2015, 35 (3):  75.  doi: 10.3780/j.issn.1000-758X.2015.03.010 Abstract ( 966 )   PDF (901KB) ( 745 )   Save null References | Related Articles | Metrics