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簡介：貴州大學碩士研究生畢業(yè)論文分類號密級論文編號貴州大學2012屆碩士研究生學位論文偏心及共振對航空高速電機軸的疲勞研究學科專業(yè)機械制造及自動化研究方向現(xiàn)代先進設備制造導師張衛(wèi)研究生劉剛中國﹒貴州﹒貴陽2015年3月貴州大學碩士研究生畢業(yè)論文I偏心及共振對航空高速電機軸的疲勞研究摘要在現(xiàn)代軸類零件疲勞壽命研究中，由于安裝誤差而引起兩軸承之間不對稱產(chǎn)生偏角的研究已經(jīng)有很多且很成熟，但是由于振動以及安裝誤差而引起軸端的偏心對軸的疲勞壽命研究分析很少，且針對偏心及振動提出一個普遍實用的解決方法也很少。所以對軸類零件進行共振驗證以及軸端偏心對疲勞壽命的影響研究具有十分重要的意義。本文通過對斷軸斷面形貌斷裂紋理分析，得到了此軸類零件斷裂主要是由于偏心、振動、斷口端面在旋轉的同時承受彎矩共同作用，斷裂性質(zhì)均為扭矩剪切應力作用下形成的過載斷裂。對電機轉子進行轉子動力學分析，得到了轉子的三階臨界轉速15655RMIN，22558RMIN，22765RMIN，與電機轉速11076RMIN對比，接近轉速安全裕度分別為858和509，均大于危險裕度10，研究說明了電機轉子不會因為臨界轉速與額定轉速接近而發(fā)生共振影響軸的疲勞壽命，同時通過模態(tài)仿真分析與固有頻率試驗分析驗證了仿真與試驗數(shù)據(jù)的準確性同時也說明了電機不會因為固有頻率而引起共振對軸疲勞壽命產(chǎn)生影響。對軸伸端進行實際偏心及應力理論計算，實際極限偏心為0125MM，軸上薄弱處應力值大小為78544MPA，通過ANSYS有限元仿真分析軟件對航空電機主軸進行模擬工況邊界條件應力分析得到軸上薄弱處應力大小為752MPA，驗證了計算結果與仿真分析的準確性，為主軸應力設計提供了可參考依據(jù)。查閱航空材料手冊得到了30CRMNSI材料的疲勞壽命曲線，并求得了曲線上13個應力點對應的疲勞壽命循環(huán)次數(shù)，根據(jù)斷軸處應力大小和SN曲線擬合得到斷軸處的疲勞壽命為20674個周期。針對在偏心及振動對軸類零件疲勞壽命的影響，提出了軸承在預緊力下及在軸承與襯套之間添加橡膠墊圈起到減振及偏心固定端轉移的目的使軸類零件壽命得到了大大的提高，并且通過每200H記錄電機前端、后端、后端側面振動的方法對電機進行了1500H的壽命實驗，且電機各部件仍能正常工作。通過理論有限元仿真讓改善前后軸上薄弱處應力對比，未加橡膠圈時軸上薄弱處應力為78544MPA，加了橡膠圈后軸上薄弱處應力大小為9578MPA，說明在相同極限偏心0125MM下，軸承與襯套接觸面開槽加橡膠圈的方法使軸上薄弱處應力大大的減小。為今后軸類零件提高疲勞壽命的實際運用方法研究提供了可參考的理論依據(jù)。關鍵字偏心；共振；理論驗證；有限元仿真；疲勞壽命

簡介：天津大學碩士學位論文民航空管網(wǎng)絡與信息安全管理體系的構建研究姓名李大海申請學位級別碩士專業(yè)管理科學與工程指導教師陳通20090801ABSTRACTAIRTRAFFICCONTROLLARGESCALEINFORMATIONSYSTEMS，INVOLVINGTHEAPPLICATIONOFMANYBUSINESSRELYINGONAHIGHDEGREEOFSECURITYTHROUGHTHECONSTRUCTIONOFAIRTRAMCCONTROLTOPROTECTINFORMATIONRESOURCESARENOTVIOLATEDTOENSURETHATINFORMATIONRESOURCESAREMINIMALRISKSANDMAXIMIZETHESECURITYBENEFITS，TOENSURET11ATTHEATCINFORMATIONINFRASTRUCTUREINFORMATIONSERVICESANDSUPPORTFACILITIESWITHTHECONFIDENTIALITYINTEGRITYAVAILABILITYCONTROLANDIMPROVEAIRTRAFFICCONTROLTHELEVELOFINFORMATIONSECURITYTHEPROTECTIONOFNATIONALSECURITYSOCIALSTABILITYANDECONOMICDEVELOPMENTTHEREFORE。INORDERTOEFFECTIVELYPREVENTANDRESOLVEINFORMATIONSECURITYRISKS，TONATIONALLEVELINFORMATIONSYSTEMSECURITYREQUIREMENTSTOPROTECTANDENSURETHESMOOTHOPERATIONOFINFORMATIONSYSTEMSANDOPERATIONSONGOING，AVIATIONSECURITYFORTHEPEOPLEESCORTINGTUBEISNECESSARYTOESTABLISHEFFECTIVEINFORMATIONSECURITYSYSTEM，ANDENHANCEINFORMATIONSECURITYANDAIRTRAFFICCONTROLCAPACITYTOGUARDAGAINSTRISKSTHISPAPERONTHEISSUEOFAIRTRAFFICCONTROLINFORMATIONSECURITYMANAGEMENTONTHECONSTRUCTIONOFSOSHALLOWINTHISPAPERTHEMAINCOMPONENTSFROMTHEFIVECHAPTERSTHEFIRSTCHAPTERISTHEINTRODUCTION，ANALYSISOFTHEIMPLEMENTATIONOFAIRTRAFFICCONTROLNETWORKANDINFORMATIONSECURITYSYSTEMOFTHENEEDTOSTUDYAIRTRAMCCONTROLNETWORKANDINFORMATIONSECURITYOBJECTIVESANDTHESIGNIFICANCEOFTHERESEARCHCONTENTINTHISARTICLESTRUCTURE，ANDINSU伍CIENT；CHAPTERIIINTRODUCEDTHENETWORKANDINFORMATIONSECURITYRELATEDCONCEPTSANDTHEMAINTHEORYANDPUBLICCONTROLOFINFORMATIONSECURITYAVIATIONLAWSANDREGULATIONS；CHAPTERIUFOCUSESONTHENETWORKANDINFORMATIONSECURITYINTHEPROCESSOFHISTORICALEVOHTIONTLLEDEVELOPMENTOFNETWORKANDINFORMATIONSECURITYTHEAIRMANAGEMENTINFORMATIONSYSTEMSECURITYPROBLEMSANDCAUSEANALYSIS；THEFOURTHCHAPTERINTRODUCESTHECHARACTERISTICSOFAIRTRAMCCONTROLINSHENZHENNETWORKANALYSISSHERTZHENATCNETWORKANDINFORMATIONSECURITYPROBLEMSANDCOUNTERMEASURESINPRACTICEASWELLASAIRTRAFFICCONTROLNETWORKTOPOLOGYSHENZHENMAJORPRACTICEMANAGEMENT；THEFI鈾CHAPTERTOIMPROVEAIRTRAFFICCONTROLNETWORKANDINFORMATIONSECURITYSYSTEMOFIDEASTOBUILDANDIMPROVETHEAIR訂A伍CCONTROLNETWORKANDINFORMATIONSECURITYSYSTEMTOBUILDPRINCIPLESANDMETHODS，ANDANALYSISOFRESISTANCETHATMAYBEENCOUNTEREDANDSOLUTIONSKEYWORDSAVIATIONATC；NETWORK；INFORMATION；SAFETY；MANAGEMENTSYSTEM；CONSTRUCTIONSTUDY

簡介：中圖分類號V2319論文編號102870216S073學科分類號082502碩士學位論文航空發(fā)動機轉子系統(tǒng)的參數(shù)化設計及組合優(yōu)化方法研究研究生姓名付堯學科、專業(yè)航空宇航推進理論與工程研究方向結構強度與完整性指導教師羅貴火副教授南京航空航天大學研究生院能源與動力學院二О一六年三月承諾書本人聲明所呈交的碩士學位論文是本人在導師指導下進行的研究工作及取得的研究成果。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(jīng)發(fā)表或撰寫過的研究成果，也不包含為獲得南京航空航天大學或其他教育機構的學位或證書而使用過的材料。本人授權南京航空航天大學可以將學位論文的全部或部分內(nèi)容編入有關數(shù)據(jù)庫進行檢索，可以采用影印、縮印或掃描等復制手段保存、匯編學位論文。（保密的學位論文在解密后適用本承諾書）作者簽名日期

簡介：分類號密綴單位代碼學號罾牡；蓑蟲唾。10699046076395碩士學位論文學位研究生作者趙瑾指導教師趔握迭專業(yè)技術職務夔授申請學位日期2007．3西北工業(yè)大學碩士學位論文ABSTI己ACTPRACTICC蛐GPLAYSAVERYIMPONA呲ROLEILLCOMPREHENDIILGANDM船TERING幽RYKILOWLEDGES，HOWEVER，ITCAN’TSATIS句STLLDENTS’PI枷CEREQMREMEM鋤DIIIⅦ，ROVETE∞HINGQULITYBE戤M∞OFOUT0FDALEINS仃ILCTI伽IALIN蛐MM蜘L協(xié)觚DEXPEILSIVEEXPE曲鼬TFHNDINAIRCRARMAJOTWITHTHEDEVELOPMENTOFCOMPUTER，VINI瑤LREALI鑼ISTOBEUSEDWIDELYINEDUCATIONREGION．、_RJNLIALRCALI哆T啪S2DTE∽HING鍘【VIRO姍ENT硒INT啪DIVE鋤DREAIISDC3DTEACLLINGENVIRONMENT，SOTLLAL“COMRIBUTESTHCSTLLDY枷VATION托DKMDSONCAP∞ITYOFSTUDEN協(xié)．THEINVESTIGATEDSLL_巧ECTPRESENTEDHEREIILFOC嵋ESPRIMADLYONTE觚城NG觚DC【P蔭M∞T，ANDSCENESIMLLLATIONSYSTEMOFAEROEN垂NETCACLLINGEXPE吐MEMSARESETLLP．PANICLLL盯柚ALYSESOFTHISSYSTEINARECOMPLCTLED自DMTHE咖TIL托鋤DAEFODYLL鼬ICD眥ACTERISTIC，SOTLLATTLLREEDIMENSI伽IAL、，IRUTAIAEFO．EI瑪INELA．BORATORYCOLLLDBEBLLIK觚DMANYEXPERIM∞TSTEACLLING嘶LLBCPERF．O徹ED，SIICH嬲，THC刪鵲SEMLLYOFEN西北，THEEXPERIMEMSIMLLLATIONOFTCSTBAY，THESIINILLATIILGOFENGILLEWORKIILG肌DMCEXPTRINLENTSILLLMA矗ONOFNOWFIELD，ETC．NEABILITYOFS黜SIN】LMATI∞IN也E掰O鋤酉∞EXPE血N％TALLABORA衄YISCARRICDOMBYMETBR∞DIINENSIONDYNAIILICMODELBUILDING觚DSCENES砌ATIONDFIV％Ⅵ恤CHISMECO∞由。D1ILIQ∞OFSCENESIMUL撕ONBASED∞MLILTIG％CRCATOR，VBGA；THEIMEMCTIVEF．啪CTIONWHICHCOMPLN．MGDESCERPTION孤D船SCMBLAGEOFAEROENGINEMODELISPERF．O肌EDBYTHEVI刪HAILDB雒EDONME脅西OVES姐DCOUISIONDET∞矗OIL，SHOWIILGTLLESMMGCHARACTERIS6CONTHEIM口邳TIONOFVIRTILALRCALITY；THCPRILLCIPLEOFTHESTE∞∞“SI∞IS細的DUCED鋤DTL尬LARGCSC他∞ADOPTINGTHEPOLARI刎ONISPUTF0，捌，WMCHSUPPLYTHELLARD眥PLATFO咖FORTHEVISUALH姍ERSIONOFME、，JNL】ALREAL時；齜PRILLCIPLEOFST啪L婦SGCNCRATIONIS姐ALYZED，ME、，ISLLALMEMODFORNLCP枷HOFTHENUIDMATERIALP枷CAL璐ING也ELINEEL鋤∞TMETHODISP把辯MED．THEPAPERDEVELOPSSUCCESSMISIIILULATIONSYSTEMFORTLLEI船TNLCDONALLAT唧MTORYSYSTEMONTHE舢一ELLGINE，BASCDONTLLED鋤ONSTRATIONDETAILEDILL眥INATEDABOVCAND讎塒NCIPL∞OFTHE∞ROEN西NE，嬲WCLL髂MEFI渤GTESTDATA．II

簡介：國內(nèi)圖書分類號TG54國際圖書分類號621西南交通大學研究生學位論文密級公開年級2Q壘級姓專二零一七年五月一零一屯牛血月的一撾材一金窒復盟題術一壓一技一星量綞加一紅削一碳一銑一用一空一工匹E目阻一西南交通大學學位論文版權使用授權書本學位論文作者完全了解學校有關保留、使用學位論文的規(guī)定，同意學校保留并向國家有關部門或機構送交論文的復印件和電子版，允許論文被查閱和借閱。本人授權西南交通大學可以將本論文的全部或部分內(nèi)容編入有關數(shù)據(jù)庫進行檢索，可以采用影印、縮印或掃描等復印手段保存和匯編本學位論文。本學位論文屬于1保密口，在年解密后適用本授權書；2不保密函使用本授權書。請在以上方框內(nèi)打“寸’學位論文作者虢加修陬日期州7羅2L指導老師簽名二丁【日期PF7，礦