深空借力飞行2f小推力轨道设计与优化

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1、AbstractAsanimportantandpopularresearchfieldinfutureastronautics，Deepspaceexplorationmissionslikesolarprobe，re—entryMoonandsmallcelestialbodyexplorationmissionshavebeenimplementedorlistedinthetimetable．Alotofeffortshavebeenmadeondeepspacetrajectorydesign，whichi

2、soneofthekeytechnologies，consideringhowtoaccomplishthemissionwithlowesttheenergyconsumptionandstillsatisfyingallthedesignconstraints．Thisdissertationpresentsstudiesonthegravity--assistandlow--thrusttrajectorydesignandoptimization，aswellasthedevelopmentsonatraje

3、ctorydesignandoptimizationsoftwaret001．Firstly,thetraditionalgravity—assisttrajectorydesignproblemismodeled．AccordingtOpatchedconicassumption，gravity—assisttrajectorycanbedividedintotwomajorsegments：theheliocentrictransfersegmentandtheplanetcentricflybysegment．

4、TheformersegmentisspecifiedbysolvingtheLambertproblem．Foracertainlaunchandarrivedate，thepositionandvelocityofconsideringplanetscanbeobtainedbyqueryingtheephemeris．Insidethesphereofinfluence，thespacecraft’Sorbitishyperbolic．Thisdissertationderivesasetofanalytica

5、lequationsthatcalculatethechangeinvelocity,energyandangularmomentum．Secondly,astudyisperformedonimpulsivegravityassist，orpoweredgravity—assist．AnimpulseisperformedintheSOIofgravity—assistplanettoachieveaexpectingeffectofgravity-assistontheassumptionofunrestrict

6、edC3match．Thechangesinvelocity,energy,andangularmomentumcausedbyimpulsivegravityassistareanalyzedwithdesigncasestofindtheefficientimpulse．Afterthat，asetofanalyticalequationstocalculateimpulseisderived．Theoptimizationofimpulseisformulatedasamulti-variable，nonlin

7、earproblemandcanbesolvedbygeneticalgorithmandnonlinearoptimizationmethodslikeSQP．Alunarimpulsivegravity—assisttrajectorydesigncaseismodeledusingtheforementionedequationsandsolvedbycombinedalgorithmofSQPandgeneticalgorithm．Thirdly,theoptimizationmethodingravity·

8、assisttrajectorydesignisperformed．Inthisdissertation，adesignstrategyispresentedofgraphicalanalyzeandoptimallaunchwindowsearch．GraphicalanalyzemethodusingtheP·Rpgraphtoprovid