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空天飞机再入轨迹的变精度序列优化方法.docx

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空天飞机再入轨迹的变精度序列优化方法 Abstract Thereentrytrajectoryofaspaceplaneisacomplextaskthatrequiresefficientoptimizationtoensureaccurateandsafereentry.Inthispaper,weproposeamethodforoptimizingtheprecisionofthespaceplane'sreentrytrajectory.Themethodinvolvesasequenceofstepsthatimprovetheaccuracyofthetrajectory,includingpre-entryandpost-entryinsertionmaneuvers,dragreduction,andattitudecontrol.Theresultsofoursimulationsdemonstratethatourapproachiseffectiveinimprovingtheprecisionofthereentrytrajectoryandensuringasafeandsuccessfulreturnofthespaceplanetoearth. Introduction Spaceplanesareanewclassofspacecraftthatcombinethefeaturesofaconventionalaircraftandaspacecraft.Theyaredesignedtotakeofffromarunwaylikeatraditionalairplane,reachhighaltitudesandvelocities,andthenreturntoearthbyglidingtoalanding.Oneofthekeychallengesinthedesignofaspaceplaneistoensureasafeandaccuratereentrytrajectory.Thereentrytrajectoryofaspaceplaneinvolvesacomplexbalanceofaerodynamic,thermal,andstructuralfactorsthatmustbeoptimizedtoensureasafeandsuccessfulreentry. Inthispaper,weproposeamethodforoptimizingtheprecisionofthespaceplane'sreentrytrajectory.Themethodinvolvesasequenceofstepsthatimprovetheaccuracyofthetrajectory,includingpre-entryandpost-entryinsertionmaneuvers,dragreduction,andattitudecontrol.Weusenumericalsimulationstodemonstratetheeffectivenessofourapproach. Methodology Theproposedmethodinvolvesfourmainsteps:pre-entryandpost-entryinsertionmaneuvers,dragreduction,andattitudecontrol. Pre-entryandPost-entryInsertionManeuvers Acriticalfactorinthereentrytrajectoryistheangleatwhichthespaceplaneenterstheearth'satmosphere.Iftheangleistoosteep,thespaceplanewillexperienceexcessiveheatingandstructuralstresses.Iftheangleistooshallow,thespaceplanemayskipofftheatmosphereandbelostinspace.Toensureasafeandaccuratereentry,weproposeperformingpre-entryandpost-entryinsertionmaneuvers. Thepre-entrymaneuverinvolvesusingthespaceplane'spropulsionsystemtoadjustthespeedandaltitudeofthespaceplanejustbeforeitenterstheatmosphere.Thisal