改进的加速度再入制导律方案研究.doc

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1、SimulationofEvolvedAccelerationReentryGuidanceforReusableLaunchVehiclesAbstract：Thetransitionalreentryguidanceofspaceshuttleswasthebaselinemethodthathadpooradaptability.HenceEvolvedAccelerationGuidanceLogicforEntry(EAGLE)isstudiedhere.Basingontheestimatedrange-to-go,thereferencedr

2、agaccelerationprofileisupdatedeveryperiod.Inthelateralprofile,basingonthegeneratedreferencedragprofile,tworeversaltimesaregotsuccessivelythroughnumericalpredictivemethod.Thetechniqueoffeedbacklinearizationisusedtotrackthereferencedragaccelerationprofile.Thealgorithmsofupdatingrefe

3、rencedragprofileandsearchingreversaltimesareboththemethodofgolden-sectionsearch,sotheEAGLEmethodcanbeperformedonboard.Thesimulationrunsofavarietyofreentryconditionsshowthattheapproachhasgoodrobustnessandreal-timeability.KeyWords:Reentryguidance;Range-to-go;Referencedragacceleratio

4、n;Lateralguidance1.IntroductionThereusablelaunchingvehicle(RLV)willbecomethemainstreamofthefuturespacetransportationforitsadvantageofhighreliabilityandlowrisk.Furthermore,theguidanceproblemofRLV,especiallyinthereentryphase,posesachallengetothesafereturnofRLVunderthethreatofhighhea

5、trate,highdynamicpressureandhighnormalload.Excepttheinequalityconstraints,RLVissupposedtoflyfrominitialconditiontoafixedend(terminalareaenergymanagement，TAEM),whichmeansthattheendstateofRLVisalsoconstrained.Thenthereentryguidanceproblemcanberegardedasatwopointboundaryvalueproblem(

6、TPBVP).Thetransitionalreentryguidanceforspaceshuttlesisanominalprofileofdragaccelerationvs.earthrelativevelocitytrackingone,whichisgeneratedbytheequipmentsongroudfirstandfollowedbychangingtheshuttleslift-to-dragratio(L/D)intheshuttles’reentry.EvolvedAccelerationGuidanceLogicforEnt

7、ry(EAGLE)isadirectextensionofthelongitudinalaccelerationguidanceusedfortheShuttle.Anditsfollowerisalineartime-varyingfeed-backcontroller,buttheinputofnominalstates(dragdeceleration,lifttodragratio,andattituderate)willberegulatedaccordingtotherangetothetargetandthepredicted(ornomin

8、al)one.What’smore,theerrorbetween