簡(jiǎn)介：西北工業(yè)大學(xué)碩士學(xué)位論文組合式航空逆變電源的設(shè)計(jì)姓名鄒仁煒申請(qǐng)學(xué)位級(jí)別碩士專(zhuān)業(yè)電力電子及電力傳動(dòng)指導(dǎo)教師吳小華20060301西北工業(yè)大學(xué)頓七學(xué)位論文ABSTRACTABSTRACTTHEAERONAUTICALSTATICINVERTERASLISTHEELECTRICITYCONVERTERTHATCONVERTSTHEMAINDCELECTRICALPOWERINTOACTL5V／400HZBYUSINGPOWERSEMICONDUCTORCOMPONENTSTHEHISTORY,PRESENTSTATUSANDDEVELOPMENTTRENDOFASIAREPRESENTEDTHEALLPOWERELECTRICITYISTHENEWTRENDOFTHEMODEMAIRPLANEBYTHEINCREMENTOFTHEELECTRONICDEVICEONAIRPLANE，THEHIGHVOLTAGE270VDCPOWERSUPPLYMODEISTHETRENDOFTHETHEMODEMAIRPLANE。BECAUSETHEHULLOFTHEAEROPLANEISTHEELECTRICALEARTHOFTHEAERONAUTICALELECTRICALACLOADANDTHEMAINDCPOWERSUPPLY,SOTHERESHOULDHAVEELECTRICALINSULATIONBETWEENTHEINPUTANDOUTPUTOFTHEASI。ONTHEBASISOFTHESINGLESTAGESOFTSWITCHINGDC／DCCONVERTERANDSINGLESTAGEDC／ACINVERTER,ANOVELCIRCUITTOPOLOGYOFCOMBINEDASIISDESIGNEDINTHELIGHTOFTHEIDEAOFRESONANTDCLINKINVERTERTHISCIRCUITTOPOLOGYISCONSTITUTEDOFAPHASESHIFTZVSZCSSOFTSWITCHINGDC／DCCONVERTETANDADC，ACINVERTER，THEFRONTSTAGEUSESTHESINGLELVOLTAGEMODECONTROLSTRATEGYA蕊THEBACKSTAGEUSESTHETHREESTATESDISCRETEPULSEMODULATIONHYSTERESISCURRENTCONTROLSTRATEGY，THEPRINCIPLEANDTHEKEYCIRCUITPARAMETERSOFTHEPSZVSZCSPWMDC／DCCONVERTERANDTHEHILGHFREQUENCYDCLINKDC／ACINVERTERTHATBASEDONTHREESTATESDISCRETEPULSEMODULATIONHYSTERESISCURRENTAREANALYZEDCAREFULLYTHEFRONTSTAGESIMULATIONISPERFORMEDBYUSINGSABERANDTHEBACKSTAGESIMULATIONISPERFORMEDBYUSINGMATLABTHEPRINCIPLEANDTHEKEYPARAMETERSAREVERIFIEDBYTHESIMULATIONRESULTSANEXPERIMENTALPROTOTYPEWITHCOMBINEDTOPOLOGYFORLKVAASIBYUSINGSOFTSWITCHINGTECHNIQUEISFABRICATEDTHEEXPERIMENTALRESULTSSHOWTHATTHECIRCUITTOPOLOGYOFTHENOVELASIISREASONABLE。KEYWORDSPHASESHIFTCOMBINEDTHREESTATESDISCRETEPULSEMODULATIONSOFTSWITCHINGHYSTERESISCURRENTCONTROL

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(guò)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(guò)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(shuō)明。研究生簽名P凡年妒7口日學(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(mén)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；坼≯礦億年凋Z汐日碩士論文航空發(fā)動(dòng)機(jī)機(jī)匣包容性準(zhǔn)則數(shù)值與實(shí)驗(yàn)初探摘要＼嘲Y帆2吣0叭6桃M1帆9啪6＼＼L＼2帆機(jī)匣包容性研究是航空發(fā)動(dòng)機(jī)設(shè)計(jì)中重要的一個(gè)環(huán)節(jié)，由于航空發(fā)動(dòng)機(jī)轉(zhuǎn)子上的葉片意外斷裂可能會(huì)導(dǎo)致嚴(yán)重的航空事故，所以，發(fā)展適用的設(shè)計(jì)方法以包容高能量的飛斷葉片非常重要。本學(xué)位論文研究了航空發(fā)動(dòng)機(jī)機(jī)匣的包容性問(wèn)題，對(duì)葉片撞擊機(jī)匣的機(jī)理進(jìn)行了分析，建立了適應(yīng)于靶板撞擊試驗(yàn)的新的包容準(zhǔn)則。首先，進(jìn)行了雙層間隔的平板打靶試驗(yàn)，通過(guò)試驗(yàn)分析了雙層機(jī)匣層距問(wèn)題對(duì)機(jī)匣包容能力的影響，對(duì)于雙層機(jī)匣的可行性進(jìn)行了研究；其次，進(jìn)行了加強(qiáng)筋靶板的打靶試驗(yàn)，通過(guò)試驗(yàn)發(fā)現(xiàn)，縱向加強(qiáng)筋對(duì)于板的彎曲變形起到了很好抵抗作用，并隨加強(qiáng)筋的根數(shù)增多其抗彎曲作用逐漸增大，加強(qiáng)筋對(duì)靶板被撞擊部位的局部剪切變形影響較小；放射狀加強(qiáng)筋對(duì)于靶板的局部抗剪切變形和抗彎曲變形能力有著一定的提升，但由于其本身具有的放射狀構(gòu)造的特性，其抗剪能力只限于放射狀筋的中心地帶。進(jìn)行了覆蓋L、2、3、4毫米四種厚度凱夫拉的金屬靶板打靶試驗(yàn)，通過(guò)試驗(yàn)對(duì)金屬靶板外側(cè)纏繞凱芙拉材料后的包容能力進(jìn)行研究。分析了葉片侵徹機(jī)匣的機(jī)理，本文創(chuàng)新性的將葉片侵徹機(jī)匣過(guò)程簡(jiǎn)化為薄板在強(qiáng)載荷作用下的動(dòng)力彎曲與穿孔問(wèn)題的結(jié)合，對(duì)葉片撞擊平板機(jī)匣過(guò)程進(jìn)行了理論建模，初步建立了一種新的包容性分析方法。通過(guò)數(shù)值試驗(yàn)的方法對(duì)撞擊過(guò)程中葉片、靶板的能量變化、撓度變形及受力情況進(jìn)行了分析，考慮了葉片塑性變形的影響，修正了以破壞一一一一勢(shì)能法為基礎(chǔ)的機(jī)匣包容經(jīng)驗(yàn)公式，使得新的準(zhǔn)則相對(duì)于舊的沒(méi)有那么保守，更具有實(shí)用性。關(guān)鍵詞航空發(fā)動(dòng)機(jī)，包容性，打靶試驗(yàn)，數(shù)值分析，新包容準(zhǔn)則

簡(jiǎn)介：電子科技大學(xué)爾I呢尺8102201010801202入凡01200000八博士學(xué)位論文001010188X110電子科技大學(xué)圖標(biāo)〕論文題目航空發(fā)動(dòng)機(jī)輪盤(pán)低周疲勞壽命預(yù)測(cè)方法研究指導(dǎo)教師黃洪鐘教授686300010界0166101100610010060601060180入00010018861311008此爪111⑷10016811016010010801600630過(guò)6000100103016030103101066101111101IV71130八34801『0炙0030000700801001800010丨6031001080106610

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簡(jiǎn)介：南京理工大學(xué)碩士學(xué)位論文航空發(fā)動(dòng)機(jī)機(jī)匣的包容性數(shù)值分析與實(shí)驗(yàn)研究姓名李海波申請(qǐng)學(xué)位級(jí)別碩士專(zhuān)業(yè)工程力學(xué)指導(dǎo)教師章定國(guó)20100601ABSTRACTWHENWOR“NG’THEROTORINAIRGASTURBINEENGINEISROTATINGATAHI曲SPEEDWHENABLADEFAILUREMLADESOFTHEROTORARETOMAPARTACCIDENTALLYOCCURS，KINETICENERGYOFTHEPROJECTILESISENORMOUSBECAUSEOFCENTRIFUGALFORCEALTHOUGHTHENON。CONTAINMENTINCIDENTSELDOMOCCURS，ONCEITHAPPENSITWILLLEADTOSERIOUSAVIATIONACCIDENTACCORDINGLY,ADOPTINGFEASIBLEDESIGNAPPROACHESTOACCOMMODATELI曲。ENERGYBLADESISNECESSITATEDTHISPAPERSYSTEMATICALLYSTUDIESSEVERALISSHESCONCERNINGAERO。ENGINECASINGCONTAINNLENT，ANDVERIFIESTHEVALIDITYOFNUMERICALANALYSISBYCONDUCTINGSHOOTINGEXPERIMEMSINADDITION，ANUMERICALSIMULATIONOFACASINGOFCERTAINMODELENGINEASWELLASANEWCASINGISCARRIEDOUTTHISPAPERMAINLYFOCUSESONTHEFOLLOWINGASPECTS1CONDUCTINGSHOOTINGEXPERIMENTSANDNUMERICALSIMULATIONRELATED9SHOOTINGEXPERIMENTSARECARRIEDOUTBYCONSIDERINGDIFFERENTSPEEDSANDDIFFERENTPOSTURESOFATARGET，INDICATINGTHENUMERICALSIMULATIONAPPLIEDINTHISDOMAINISFEASIBLE2THENUMERICALANALYSISOFENGINECASINGCONTAINMENTCONTAINMENTPERFORMANCEOFCERTAINENGINEDESIGNEDINCHINAISNUMERICALLYANALYZEDFROMALLPERSPECTIVESCONTAINMENTCAPABILITYOF1ST，2NDAND3RDGRADESISANALYZEDINITIALLYTHEINTERFERENCESOFTHEFRACTUREANDBLADESREMAINED，ALONGWITHTHEIMPACTONCONTAI衄ENTINABLADEFAILUREARESTUDIEDTHECASINGCONTAINMENTOFAPRACTICALENGINELSTHEREBYEVALUATED3NUMERICALSIMULATIONOFCASINGCONTAINMENTN啪ERICALSIMULATIONSFORDOUBLEDECKENGINECASINGWITHTITANIUMALLOYINNERDECKANDCOMPOSITEOUTERDECKARECONDUCTEDTHICKNESSOFCONTAINMENTISOBTAINEDBYCHANGINGTHETLLICLMESSOFBOTHINNERANDTHEOUTERDECKTHEIMPACTONCONTAINMENTOFTHEDOUBLEDECKENGINECASINGISANALYZEDANDCOMPAREDOPTIMIZEDCLEARANCEDISTANCEWHICHPROVIDESAREFERENCEFORDEVELOPINGSLOPEENGINECASINGISDERIVEDIMPROVEMENTSOFCONTAINMENTBYADDINGFLANGESTOANENGINECASTINGAREDISCUSSEDBYCONDUCTINGNUMERICALSIMULATIONSBESIDES，THEOPTIMALQUANTITYANDLOCATIONOFFLANGESAREOBTAINEDTOINCREASECONTAINMENTTHECONTAIMNENTOFMETALCASINGWITHKEVLARAROUNDTHEOUTSIDEISANALYZED，WHICHPROVIDESAREFERENCEFORFUTUREDESIGNKEYWORDSTHEAEROENGINE，CASING，CONTAINMENT，NUMERICALSIMULATION

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