簡介：南京航空航天大學碩士學位論文航天材料輻射防護性能的模擬研究姓名楊浩申請學位級別碩士專業(yè)核技術及應用指導教師魏志勇20090101航天材料質子防護性能的模擬研究IIABSTRACTNEAREARTHSPACEFILLEDAVARIETYOFAPPLICATIONSSATELLITES，MANNEDSPACECRAFT，MANNEDSPACELABATYTHEREAREAGREATDEALOFHIGHENERGYPARTICLESWHICHWERECAPTUREDBYTHEMAGICFIELDSERIOUSLYAFFECTINGSPACECRAFT，DETECTIONEQUIPMENTASTRONAUTSAFETYALONGWITHTHESWIFTDEVELOPMENTOFOURSPACEFLIGHTENTERPRISETHERESEARCHOFRADIATIONSHIELDMATERIALHAVEMEMEIMPTANTMEANINGTHISARTICLECONSIDERSTHERADIATIONPROTECTIONPROPERTYOFSPACECRAFTMATERIALSTOGETHERWITHTHEPROBLEMOFSPACECRAFTSCARRYINGCAPACITYTHISARTICLEMAKESTHEAPPRAISALFROMTHERADIATIONSHIELDANGLETOASTRONAUTICSMATERIALSBARRIERPROPERTYWITHTHEMONTECARLOMETHODTHERADIOPROTECTIONCAPABILITYOFMATERIALTOTHEPROTONWASAPPRAISEDFROMTHEPERSPECTIVESOFSTOPPINGPOWERRANGEMANYKINDSOFSIMPLEMATERIALSARESIMULATEDONRADIATIONPROTECTIONPROPERTYTHECONCLUSIONISGOTTENBYCONTRASTINGTHEMASSRANGEMASSSTOPPINGPOWEROFMANYKINDSOFSIMPLEMATERIALSUNDERTHESAMELEVELQUALITYCONDITIONTHERADIATIONSHIELDABILITYREDUCESALONGWITHTHEINCREASINGOFTHEATOMICITYOFMATERIALTHEREFEGENERALLYSPEAKINGITISADVANTAGEOUSTOUSETHELOWATOMICNUMBERMATERIALSINDERTOSTRENGTHENTHESPACECRAFTANTIEMISSIVITYENHANCESSPACECRAFTSSTABILITYTAKEINTOACCOUNTTHEACTUALSPACECONDITIONSEVERALSPACEFLIGHTMATERIALSARESIMULATEDABOUTRADIATIONSHIELDEFFECTTHEREAREFOLLOWINGCONCLUSIONSTHEADVANCEDCOMPOUNDMATERIALSHAVETHEBETTERRADIATIONSHIELDPERFMANCEINTHESPACEENVIRONMENTCOMPAREDTOTHETRADITIONALALMATERIALTHEINGREDIENTISBESTBYTHEPOLYETHYLENECOMPOUNDMATERIALSPRIMARILYTOTHEPROTONRADIATIONSHIELDPROPERTYITWILLHAVETHEVERYGOODAPPLICATIONPOTENTIALINTHESPACECRAFTINTERIMANUFACTURETHEALUMINUMLITHIUMALLOYCOMPOUNDMATERIALSPRIMARILYWILLHAVETHEVERYGOODAPPLICATIONVALUEINSPACECRAFTSSTRUCTUREMANUFACTUREKEYWDSGEANT4，PROTON，RANGE，STOPPINGPOWER，SPACECRAFT，COMPOUNDMATERIALS

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簡介：國內圖書分類號V2471學校代碼10213國際圖書分類號6297密級公開工學博士學位論文星箭一體化航天器時變計算機技術研究博士研究生趙丹導師徐國棟申請學位工學博士學科信息與通信工程所在單位衛(wèi)星技術研究所答辯日期2010年6月授予學位單位哈爾濱工業(yè)大學摘要I摘要為了對突發(fā)性自然災害進行及時觀測，在第一時間內迅速獲得相關信息以供決策系統(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建。小型運載器與小型衛(wèi)星的使用是完成這一任務的有效途徑，但是由于小型運載器的運載能力有限，往往使其應用受到限制。針對上述問題，本文在國家高技術研究發(fā)展計劃863的支持下，提出星箭一體化航天器的概念，打破傳統(tǒng)運載器與衛(wèi)星相互獨立的系統(tǒng)設計方法，將二者一體化集成，通過硬件的分時復用，降低航天器系統(tǒng)質量，有效提高發(fā)射能力。本文重點對星箭一體化航天器的主控計算機進行研究與設計，主要內容如下為了滿足星箭一體化航天器對主控計算機高功能密度、高性能、高可靠性、低成本的要求，本文突破傳統(tǒng)計算機基于固定結構處理器的設計方法，提出一種基于可重構計算技術的時變計算機，應用動態(tài)重構與SOPC設計等進行體系結構與功能設計，能夠在運載段與在軌段分別完成傳統(tǒng)箭載與星載計算機的工作。為了保證時變計算機體系結構的可靠性，充分考慮單元器件失效的隨機性，提出基于蒙特卡羅模擬的可靠性驗證方法，將可靠性驗證引入設計過程，根據驗證結果完善時變計算機體系結構。目前解決FPGA暫時與永久性損傷問題較為系統(tǒng)的容錯設計多基于實驗室特殊器件進行，缺乏通用性。針對這一問題，本文提出面向基于商用FPGA器件的可重構系統(tǒng)的動態(tài)混合冗余容錯設計方法，結合硬件冗余、時間冗余與信息冗余技術，通過動態(tài)雙模重構、配置比特流回讀以及損傷屏蔽等技術實現(xiàn)對暫時性失效與永久性損傷的修復。與傳統(tǒng)靜態(tài)三模冗余系統(tǒng)相比較，采用動態(tài)混合法實現(xiàn)的時變計算機容錯系統(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優(yōu)勢。針對傳統(tǒng)航天器依靠地面進行任務規(guī)劃的工作模式維護成本高且受通信時間限制的問題，在時變計算機硬件體系結構基礎上，進行星箭一體化航天器自主任務規(guī)劃設計。本文打破經典規(guī)劃問題基于強約束限制假設、忽略運行環(huán)境與運行狀態(tài)的不確定性的設計方法，提出基于隱馬爾可夫模型的自主任務規(guī)劃系統(tǒng)，針對不確定因素對航天器的影響問題，建立自主任務規(guī)劃隱馬氏雙重隨機過程的數(shù)學模型，通過前向后向迭代與BAUMWELCH算法對問題進行求解，在運行過程

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簡介：隸南Y太粵碩士學位論文分布式航天器自組織網絡協(xié)議設計與實現(xiàn)專業(yè)名稱信墨皇筐J皇處堡研究生姓名睦薟導師姓名王楹獨創(chuàng)性說明東南大學學位論文獨創(chuàng)性聲明本人聲明所呈交的學位論文是我個人在導師指導下進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注和致謝的地方外，論文中不包含其他人已經發(fā)表或撰寫過的研究成果，也不包含為獲得東南大學或其它教育機構的學位或證書而使用過的材料。與我一同工作的同志對本研究所做的任何貢獻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咀東南大學學位論文使用授權聲明東南大學、中國科學技術信息研究所、國家圖書館有權保留本人所送交學位論文的復印件和電子文檔，可以采用影印、縮印或其他復制手段保存論文。本人電子文檔的內容和紙質論文的內容相一致。除在保密期內的保密論文外，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內容或中、英文摘要等部分內容。論文的公布包括以電子信息形式刊登授權東南大學研究生院辦理。研究生簽名二玨J率導師簽名日期趔形

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簡介：聲明本學位論文是我在導師的指導下取得的研究成果，盡我所知，在本學位論文中，除了加以標注和致謝的部分外，不包含其他人已經發(fā)表或公布過的研究成果，也不包含我為獲得任何教育機構的學位或學歷而使用過的材料。與我一同工作的同事對本學位論文做出的貢獻均已在論文中作了明確的說明。研究生簽名劫L鄉(xiāng)年弓月啪學位論文使用授權聲明南京理工大學有權保存本學位論文的電子和紙質文檔，可以借閱或上網公布本學位論文的部分或全部內容，可以向有關部門或機構送交并授權其保存、借閱或上網公布本學位論文的部分或全部內容。對于保密論文，按保密的有關規(guī)定和程序處理。研究生簽名訓≥年≥只麗碩士論文航天器再入段電波特性及加磁場減輕黑障效應研究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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