簡(jiǎn)介：南京航空航天大學(xué)碩士學(xué)位論文航天材料輻射防護(hù)性能的模擬研究姓名楊浩申請(qǐng)學(xué)位級(jí)別碩士專業(yè)核技術(shù)及應(yīng)用指導(dǎo)教師魏志勇20090101航天材料質(zhì)子防護(hù)性能的模擬研究IIABSTRACTNEAREARTHSPACEFILLEDAVARIETYOFAPPLICATIONSSATELLITES，MANNEDSPACECRAFT，MANNEDSPACELABATYTHEREAREAGREATDEALOFHIGHENERGYPARTICLESWHICHWERECAPTUREDBYTHEMAGICFIELDSERIOUSLYAFFECTINGSPACECRAFT，DETECTIONEQUIPMENTASTRONAUTSAFETYALONGWITHTHESWIFTDEVELOPMENTOFOURSPACEFLIGHTENTERPRISETHERESEARCHOFRADIATIONSHIELDMATERIALHAVEMEMEIMPTANTMEANINGTHISARTICLECONSIDERSTHERADIATIONPROTECTIONPROPERTYOFSPACECRAFTMATERIALSTOGETHERWITHTHEPROBLEMOFSPACECRAFTSCARRYINGCAPACITYTHISARTICLEMAKESTHEAPPRAISALFROMTHERADIATIONSHIELDANGLETOASTRONAUTICSMATERIALSBARRIERPROPERTYWITHTHEMONTECARLOMETHODTHERADIOPROTECTIONCAPABILITYOFMATERIALTOTHEPROTONWASAPPRAISEDFROMTHEPERSPECTIVESOFSTOPPINGPOWERRANGEMANYKINDSOFSIMPLEMATERIALSARESIMULATEDONRADIATIONPROTECTIONPROPERTYTHECONCLUSIONISGOTTENBYCONTRASTINGTHEMASSRANGEMASSSTOPPINGPOWEROFMANYKINDSOFSIMPLEMATERIALSUNDERTHESAMELEVELQUALITYCONDITIONTHERADIATIONSHIELDABILITYREDUCESALONGWITHTHEINCREASINGOFTHEATOMICITYOFMATERIALTHEREFEGENERALLYSPEAKINGITISADVANTAGEOUSTOUSETHELOWATOMICNUMBERMATERIALSINDERTOSTRENGTHENTHESPACECRAFTANTIEMISSIVITYENHANCESSPACECRAFTSSTABILITYTAKEINTOACCOUNTTHEACTUALSPACECONDITIONSEVERALSPACEFLIGHTMATERIALSARESIMULATEDABOUTRADIATIONSHIELDEFFECTTHEREAREFOLLOWINGCONCLUSIONSTHEADVANCEDCOMPOUNDMATERIALSHAVETHEBETTERRADIATIONSHIELDPERFMANCEINTHESPACEENVIRONMENTCOMPAREDTOTHETRADITIONALALMATERIALTHEINGREDIENTISBESTBYTHEPOLYETHYLENECOMPOUNDMATERIALSPRIMARILYTOTHEPROTONRADIATIONSHIELDPROPERTYITWILLHAVETHEVERYGOODAPPLICATIONPOTENTIALINTHESPACECRAFTINTERIMANUFACTURETHEALUMINUMLITHIUMALLOYCOMPOUNDMATERIALSPRIMARILYWILLHAVETHEVERYGOODAPPLICATIONVALUEINSPACECRAFTSSTRUCTUREMANUFACTUREKEYWDSGEANT4，PROTON，RANGE，STOPPINGPOWER，SPACECRAFT，COMPOUNDMATERIALS

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簡(jiǎn)介：國(guó)內(nèi)圖書分類號(hào)V2471學(xué)校代碼10213國(guó)際圖書分類號(hào)6297密級(jí)公開工學(xué)博士學(xué)位論文星箭一體化航天器時(shí)變計(jì)算機(jī)技術(shù)研究博士研究生趙丹導(dǎo)師徐國(guó)棟申請(qǐng)學(xué)位工學(xué)博士學(xué)科信息與通信工程所在單位衛(wèi)星技術(shù)研究所答辯日期2010年6月授予學(xué)位單位哈爾濱工業(yè)大學(xué)摘要I摘要為了對(duì)突發(fā)性自然災(zāi)害進(jìn)行及時(shí)觀測(cè)，在第一時(shí)間內(nèi)迅速獲得相關(guān)信息以供決策系統(tǒng)使用，需要天基信息系統(tǒng)能夠在低成本的限制下快速構(gòu)建。小型運(yùn)載器與小型衛(wèi)星的使用是完成這一任務(wù)的有效途徑，但是由于小型運(yùn)載器的運(yùn)載能力有限，往往使其應(yīng)用受到限制。針對(duì)上述問題，本文在國(guó)家高技術(shù)研究發(fā)展計(jì)劃863的支持下，提出星箭一體化航天器的概念，打破傳統(tǒng)運(yùn)載器與衛(wèi)星相互獨(dú)立的系統(tǒng)設(shè)計(jì)方法，將二者一體化集成，通過硬件的分時(shí)復(fù)用，降低航天器系統(tǒng)質(zhì)量，有效提高發(fā)射能力。本文重點(diǎn)對(duì)星箭一體化航天器的主控計(jì)算機(jī)進(jìn)行研究與設(shè)計(jì)，主要內(nèi)容如下為了滿足星箭一體化航天器對(duì)主控計(jì)算機(jī)高功能密度、高性能、高可靠性、低成本的要求，本文突破傳統(tǒng)計(jì)算機(jī)基于固定結(jié)構(gòu)處理器的設(shè)計(jì)方法，提出一種基于可重構(gòu)計(jì)算技術(shù)的時(shí)變計(jì)算機(jī)，應(yīng)用動(dòng)態(tài)重構(gòu)與SOPC設(shè)計(jì)等進(jìn)行體系結(jié)構(gòu)與功能設(shè)計(jì)，能夠在運(yùn)載段與在軌段分別完成傳統(tǒng)箭載與星載計(jì)算機(jī)的工作。為了保證時(shí)變計(jì)算機(jī)體系結(jié)構(gòu)的可靠性，充分考慮單元器件失效的隨機(jī)性，提出基于蒙特卡羅模擬的可靠性驗(yàn)證方法，將可靠性驗(yàn)證引入設(shè)計(jì)過程，根據(jù)驗(yàn)證結(jié)果完善時(shí)變計(jì)算機(jī)體系結(jié)構(gòu)。目前解決FPGA暫時(shí)與永久性損傷問題較為系統(tǒng)的容錯(cuò)設(shè)計(jì)多基于實(shí)驗(yàn)室特殊器件進(jìn)行，缺乏通用性。針對(duì)這一問題，本文提出面向基于商用FPGA器件的可重構(gòu)系統(tǒng)的動(dòng)態(tài)混合冗余容錯(cuò)設(shè)計(jì)方法，結(jié)合硬件冗余、時(shí)間冗余與信息冗余技術(shù)，通過動(dòng)態(tài)雙模重構(gòu)、配置比特流回讀以及損傷屏蔽等技術(shù)實(shí)現(xiàn)對(duì)暫時(shí)性失效與永久性損傷的修復(fù)。與傳統(tǒng)靜態(tài)三模冗余系統(tǒng)相比較，采用動(dòng)態(tài)混合法實(shí)現(xiàn)的時(shí)變計(jì)算機(jī)容錯(cuò)系統(tǒng)不論是系統(tǒng)可靠性還是系統(tǒng)資源占用情況都占有絕對(duì)優(yōu)勢(shì)。針對(duì)傳統(tǒng)航天器依靠地面進(jìn)行任務(wù)規(guī)劃的工作模式維護(hù)成本高且受通信時(shí)間限制的問題，在時(shí)變計(jì)算機(jī)硬件體系結(jié)構(gòu)基礎(chǔ)上，進(jìn)行星箭一體化航天器自主任務(wù)規(guī)劃設(shè)計(jì)。本文打破經(jīng)典規(guī)劃問題基于強(qiáng)約束限制假設(shè)、忽略運(yùn)行環(huán)境與運(yùn)行狀態(tài)的不確定性的設(shè)計(jì)方法，提出基于隱馬爾可夫模型的自主任務(wù)規(guī)劃系統(tǒng)，針對(duì)不確定因素對(duì)航天器的影響問題，建立自主任務(wù)規(guī)劃隱馬氏雙重隨機(jī)過程的數(shù)學(xué)模型，通過前向后向迭代與BAUMWELCH算法對(duì)問題進(jìn)行求解，在運(yùn)行過程

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簡(jiǎn)介：隸南Y太粵碩士學(xué)位論文分布式航天器自組織網(wǎng)絡(luò)協(xié)議設(shè)計(jì)與實(shí)現(xiàn)專業(yè)名稱信墨皇筐J皇處堡研究生姓名睦薟導(dǎo)師姓名王楹獨(dú)創(chuàng)性說明東南大學(xué)學(xué)位論文獨(dú)創(chuàng)性聲明本人聲明所呈交的學(xué)位論文是我個(gè)人在導(dǎo)師指導(dǎo)下進(jìn)行的研究工作及取得的研究成果。盡我所知，除了文中特別加以標(biāo)注和致謝的地方外，論文中不包含其他人已經(jīng)發(fā)表或撰寫過的研究成果，也不包含為獲得東南大學(xué)或其它教育機(jī)構(gòu)的學(xué)位或證書而使用過的材料。與我一同工作的同志對(duì)本研究所做的任何貢獻(xiàn)均已在論文中作了明確的說明并表示了謝意。研究生簽名一煎J、_一日期一塑卑I咀東南大學(xué)學(xué)位論文使用授權(quán)聲明東南大學(xué)、中國(guó)科學(xué)技術(shù)信息研究所、國(guó)家圖書館有權(quán)保留本人所送交學(xué)位論文的復(fù)印件和電子文檔，可以采用影印、縮印或其他復(fù)制手段保存論文。本人電子文檔的內(nèi)容和紙質(zhì)論文的內(nèi)容相一致。除在保密期內(nèi)的保密論文外，允許論文被查閱和借閱，可以公布包括以電子信息形式刊登論文的全部?jī)?nèi)容或中、英文摘要等部分內(nèi)容。論文的公布包括以電子信息形式刊登授權(quán)東南大學(xué)研究生院辦理。研究生簽名二玨J率導(dǎo)師簽名日期趔形

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簡(jiǎn)介：聲明本學(xué)位論文是我在導(dǎo)師的指導(dǎo)下取得的研究成果，盡我所知，在本學(xué)位論文中，除了加以標(biāo)注和致謝的部分外，不包含其他人已經(jīng)發(fā)表或公布過的研究成果，也不包含我為獲得任何教育機(jī)構(gòu)的學(xué)位或?qū)W歷而使用過的材料。與我一同工作的同事對(duì)本學(xué)位論文做出的貢獻(xiàn)均已在論文中作了明確的說明。研究生簽名劫L鄉(xiāng)年弓月啪學(xué)位論文使用授權(quán)聲明南京理工大學(xué)有權(quán)保存本學(xué)位論文的電子和紙質(zhì)文檔，可以借閱或上網(wǎng)公布本學(xué)位論文的部分或全部?jī)?nèi)容，可以向有關(guān)部門或機(jī)構(gòu)送交并授權(quán)其保存、借閱或上網(wǎng)公布本學(xué)位論文的部分或全部?jī)?nèi)容。對(duì)于保密論文，按保密的有關(guān)規(guī)定和程序處理。研究生簽名訓(xùn)≥年≥只麗碩士論文航天器再入段電波特性及加磁場(chǎng)減輕黑障效應(yīng)研究ABSTRACTFUNCTIONALANDFINECOMMUNICATIONSYSTEMISINDISPENSABLEANDCRUCIALDURINGREENTRYPROCESS，WHICHGUARANTEESTHESAFELANDINGOFREENTRYCAPSULES．NEVERTHELESS，REENTRYPLASMAISPRODUCEDDUETOSHOCKCOMPRESSIONSANDVISCOUSHEATSENCOUNTEREDBYREENTRYCAPSULESATHYPERSONICSPEED．THEPLASMAISNOTHINGLESSTHANASPECIALCONDUCTIVEMEDIUM，WHICHWILLDRASTICALLYINTERACTWITHRADIOWAVESANDHAVEAFATALEFFECTONITSPROPAGATIONSASARESULT，EVENGIVERISETOBLACKOUTPHENOMENONWITHINSEVERALMINUTES．INTHISCONDITION，COMMUNICATIONPERFORMANCENOTSOMUCHONLYDEPENDONTHEPROPERTYOFWIRELESSEQUIPMENTSOFCAPSULESASNEEDTOTAKETHEADVERSEENVIRONMENTOFRADIOWAVESFULLYINTOACCOUNT．THEREFORE，THEIMPACTSOFPLASMAONWAVESSHOULDBECONSIDEREDANDDISSECTEDINADVANCEBEFOREINVESTIGATINGTHEREENTRYCOMMUNICATIONTECHNOLOGY,ANDTHENGROPEFOREXPEDIENTANDADVISABLEMITIGATIONSANDALLEVIATIONSONPLASMAEFFECTS．ONLYINTHISWAYCARLCOMMUNICATIONDETERIORATIONANDITSQUALITYBEFAVOURABLYIMPROVED．FIRSTLY,THEORETICALFOUNDATIONOFPLASMAPHRSICSANDPLASMASHEATHTHEORYISBRIEFLYINTRODUCEDINTHISTHESIS．SECONDLY，THEWAVEPROPAGATIONSINREENTRYPLASMAHASBEENSYSTEMATICALLYINVESTIGATEDADOPTINGANALYTICMETHODOLOGYINMACROGRAPHY1ELECTROMAGNETICWAVEARENUATIONCONSTANTISSIMULATEDBYMEANSOFMATLABATFIRST，THENTHESPECIALEFFECTOFCOLLISIONFREQUENCYONRADIOWAVESHASBEENILLUSTRATEDEMPHATICALLYBASEDONTHESIMULATIONS；2THEDERIVATIONSOFSCATTERINGMATRIXESFORWAVEPROPAGATIONINNONMAGNETICANDINHOMOGENEOUSPLASMAISALSOPERFORMEDTHEORETICAUY；3INADDITION，THEMAINRESEARCHISTOCONCENTRATEBOTHONVERTICALANDOBLIQUEINCIDENCEINNONMAGNETICANDHOMOGENEOUSPLASMA,ANDPOWERABSORPTIONCOEFFICIENTANDPOWERREFLECTIONCOEFFICIENTOFELECTROMAGNETICWAVESAREFORMULATEDANDSIMULATEDRESPECTIVELYEMPLOYINGMATLAB；4FURTHERMORE，TRANSMISSISONCHARACTERISTICSTHOUGHREENTRYPLASMAISALSOSIMULATEDANDANALYZED．MEANWHILE，THERELEVANTUNIVERSALINTERFACESHAVEBEENDESIGNEDBASEDONMATLABGUIPLATFORMFORMOREINTUITIONISTICANDENTIRECALCULATIONSOFRADIOWAVEPROPAGATIONPROPERTYINTHEPLASMA．THIRDLY,ONTHEBASISOFTHEPROPAGATIONPROPERTYWEHAVEJUSTDISCUSSED，COMMUNICATIONPERFORMANCEOFRADIOWAVETHROUGHPLASMAISBRIEFLYEXEMPLIFIEDINMPSKSYSTEM．ONPROPOSINGREENTRYCHANNELMODELINPLASMA，THEBITERRORRATEOFEACHMATDIFFERENTREENTRYHEIGHTISDEDUCEDANDCACULATED，BUTTHERESULTCANNOTBEPULISHEDCOMPLETELYFORITHASBEENCONFINEDINANUNAUTHORIZEDPATENTWITHTHECODEOF201218002827．8．III

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簡(jiǎn)介：西北工業(yè)大學(xué)碩士學(xué)位論文航天器軌道轉(zhuǎn)移與交會(huì)最優(yōu)控制研究姓名李亮申請(qǐng)學(xué)位級(jí)別碩士專業(yè)一般力學(xué)與力學(xué)基礎(chǔ)指導(dǎo)教師和興鎖20050301西北工業(yè)大學(xué)碩士學(xué)位論文摘要ABSTRACTTHISPAPERINVESTIGATESPROBLEMSOFOPTIMUMORBITTRANSFERANDRENDEZVOUSACCORDINGTOOPTIMALCONTROLTHEORYANDTHEPONTRYAGINMAXIMUMPRINCIPLEKINETICVARIABLESANDKINEMATICVARIABLESARESELECTEDASSTATEVARIABLESRESPECTIVELYKINETICVARIABLESAREDISPLACEMENTANDVELOCITYVECTORSFIRSTLYTHEOPTIMALCONTROLEQUATIONSAREFOUNDEDINCARTESIANCOORDINATESYSTEMTHEANALYTICSOLUTIONSOFIMPULSEORBITAREANALYZEDDETAILEDLYANDTHEOPTIMALCONTROLSOLUTIONSOFCOPLANARIMPULSETRANSFERORBITAREDETERMINEDSECONDLYTHEOPTIMALCONTROLEQUATIONSOFLIMITEDPOWERTRANSFERANDITSNUMERICALSOLUTIONAREDEVELOPEDFINALLYTHEOPTIMALCONTROLEQUATIONSINPOLARCOORDINATESANDITSNUMERICALSOLUTIONAREINTRODUCEDKINEMATICVARIABLESAREORBITELEMENTSOFSPACECRAFTTHEANALYTICSOLUTIONSAREDETERMINEDFOROPTIMUMLOWTHRUSTPOWERTRANSFERANDRENDEZVOUSBETWEENARBITRARYNEIGHBORINGORBITSINSTRONGGRAVITYFIELDSAFTERAPPLYINGMEANELEMENTMETHODTHEANALYTICSOLUTIONSAREDETERMINEDFOROPTIMUMLOWTHRUSTPOWERTRANSFERTRANSFERANDRENDEZVOUSBETWEENARBITRARYNEIGHBORINGORBITSINCONSIDERINGTHEEARTHSOBLATENESSTHECHANGESOFOPTIMALTRAJECTORYCAUSEDBYEARTHSOBLATENESSARECOMPUTEDSEVERALCONCLUSIONSARESUMMARIZEDFROMTHISPAPERTHEOPTIMALCONTROLEQUATIONSBASEDONKINETICVARIABLESCANEXPEDIENTLYDEVELOPTHECOPLANARANALYTICSOLUTIONSWHICHHAVECLEARKINETICMEANINGTHEOPTIMALCONTROLEQUATIONSBASEDONKINEMATICVARIABLESCANGETITSANALYTICSOLUTIONOFSPACEORBITTRANSFERANDCANGETTHEANALYTICSOLUTIONWHENCONSIDERINGTHEEARTHSOBLATENESSINACTUALAPPLICATIONWECANUSETHEOPTIMALCONTROLSOLUTIONSOFTHISPAPERACCORDINGTODIFERENTSIMPLIFICATIONKEYWORDSSPACECRAFTORBITTRANSFERORBITRENDEZVOUSOPTIMALCONTROL

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