簡(jiǎn)介：碩士學(xué)位論文碩士學(xué)位論文某型渦扇航空發(fā)動(dòng)機(jī)雙轉(zhuǎn)子軸承系統(tǒng)動(dòng)力學(xué)特性分析DYNAMICACTERISTICSANALYSISOFTHEDUALROTBEARINGSYSTEMOFATURBOFANAEROENGINE王思聰王思聰哈爾濱工業(yè)大學(xué)哈爾濱工業(yè)大學(xué)2015年7月CLASSIFIEDINDEXV23513UDC621DISSERTATIONFTHEMASTERDEGREEINENGINEERINGDYNAMICACTERISTICSANALYSISOFTHEDUALROTBEARINGSYSTEMOFATURBOFANAEROENGINECIDATEWANGSICONGSUPERVISPROFJIAOYINGHOUACADEMICDEGREEAPPLIEDFMASTEROFENGINEERINGSPECIALITYMECHANICALDESIGNTHEYAFFILIATIONSCHOOLOFMECHATRONICSENGINEERINGDATEOFDEFENCEJULY2015DEGREECONFERRINGINSTITUTIONHARBININSTITUTEOFTECHNOLOGY

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簡(jiǎn)介：中圖分類號(hào)TH132論文編號(hào)102870513S160學(xué)科分類號(hào)080203碩士學(xué)位論文乏無油潤(rùn)滑航空齒輪傳動(dòng)的磨損及溫度場(chǎng)分析研究生姓名丁有永學(xué)科、專業(yè)機(jī)械設(shè)計(jì)及理論研究方向機(jī)械CAD及自動(dòng)化指導(dǎo)教師朱如鵬教授南京航空航天大學(xué)研究生院機(jī)電學(xué)院二O一三年三月承諾書本人聲明所呈交的碩士學(xué)位論文是本人在導(dǎo)師指導(dǎo)下進(jìn)行的研究工作及取得的研究成果。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，也不包含為獲得南京航空航天大學(xué)或其他教育機(jī)構(gòu)的學(xué)位或證書而使用過的材料。本人授權(quán)南京航空航天大學(xué)可以將學(xué)位論文的全部或部分內(nèi)容編入有關(guān)數(shù)據(jù)庫進(jìn)行檢索，可以采用影印、縮印或掃描等復(fù)制手段保存、匯編學(xué)位論文。（保密的學(xué)位論文在解密后適用本承諾書）作者簽名日期

簡(jiǎn)介：西南交通大學(xué)碩士學(xué)位論文航空風(fēng)險(xiǎn)評(píng)價(jià)技術(shù)研究姓名莊瑞剛申請(qǐng)學(xué)位級(jí)別碩士專業(yè)交通運(yùn)輸工程指導(dǎo)教師蒲云200191西南交通大學(xué)工程碩士學(xué)位研究生學(xué)位論文第1I頁ABSTRACTTHEEVALUATIONTECHNOLOGYOFCIVILAVIATIONRISKANDTHEAVIATIONSMRETYISAWORLDWIDEPROBLEMTOBESOLVEDTHEPURPOSEOFSETTINGUDTHECIVILAVIATIONRISKEVALUATIONSYSTEMISTOIMPROVEAVIATIONSAFETY,TOPROVIDETECHNICALMEANSANDMANAGEMENTTHOUGHTSOFSAFETYDECISIONFORTHEMANAGERSOFTHECIVILAVIATIONTHEUSEINCIVILAVIATIONOFTHESYSTEMISNOTONLYANEFFECTIVEWAYTOIMPROVETHESAFETYOFFLIGHT，BUTALSOALLEFFECTIVEWAYTOENSURETHEPROFIT，HONORANDDEVELOPMENTOFTHECIVILAVIATIONOPERATORSITCANBEUSEDASATOOLOFMAKINGSAFETYDECISIONSINTHECIVILAVIATIONOPERATIONANDPREVENTINGTHEAVIATIONRISKNOWADAYS,THEANALYSISOFTHEINTEMATIONAICIVILAVIATIONACCIDENTSISMORESTRESSEDONTHEREASONSBUTLESSONTHEEVALUATIONS，ANDMOREEMPHASIZEDONTHEANALYSISOFSINGLEFACTORBUTLESSONTHEANALYSISOFTHECOMPREHENSIVEOFFACTORSVERVFEWARECARRIEDOUTFORHOWTHEPEOPLESHOULDTOIEARNTHELESSONSFFOMTHEEXPERIENCESANDTHERELATEDINFORMATIONOFTHEAVIATIONACCIDENTS．CONSIDERINGWHATAREMENTIONEDABOVE,ITISVERYESSENTIALTOESTABLISHANANALY。SISANDEVALUATIONMODEIOFTHEATCCONFLICTTECHNOLOGY．THISHASTOBEBASEDONTHERESEARCHOFTHEAVIATIONSAFETY,THEANALYSISANDEVALUATIONOFTHEAVIATIONACCIDENTS，THEPRECISIONWITHTHECONCERNEDJNFORMATIONTHEMAINPUMOSEOFESTABLISHINGTHEAVIATIONSAFETYSYSTEMISTOPREVENTTHEAVIATIONRISKITWILIBEIMPORTANTBASEMENTSTOPROVIDETHEOPERATORSWITHIMPORTANTEVIDENCESOFMAKINGALLIDEADECISIONTOIMPROVESAFETYLEVELANDMINIMIZEAVIATIONFISKTHEAVIATIONTRANSPORTATIONSYSTEMCONSISTSOFHUMANBEINGCOMPANYOPERATORS，F(xiàn)LIGHTCREWS，ATCCONTROLLERS、MAINTENANCEPERSONNELANDPASSENGERS，F(xiàn)ACILITIESAIRPORTS，AIRWAYFACILITIESANDOTHERSERVICINGFACILITIES，EQUIPMENTAIRCRAFTANDITSSYSTEMS，F(xiàn)LIGHTENVIRONMENT一AREA，METEOROLOGY／CLIMATE，F(xiàn)LIGHTCONDITIONS，ETC，TRANSPORTATIONMANAGEMENTANDORGANIZATIONS．THISISAVERYCOMPLICATINGSYSTEMWITHLOTSOFFACTORSHAVEEFFECTSONEACHOTHER．THEAVIATIONTRANSPORTATIONSYSTEMISALSOCOMBINEDWITHAVIATIONSAFETYWHICHFORMSAMORECOMPLICATINGSYSTEMTHANJTALREADYIS．INORDERTOTAKETHEFULLADVANTAGESOFTHEAVIATIONSAFETYS57STEMANDTOMAKEITMOREREASONABLEANDSAFERANDMOREEFFICIENT，ITISNECESSARYTOSETUPTHEAVIATIONSAFETYENGINEERINGSYSTEMTHEGENERALSTRUCTUREOFTHISESSAYJSSTATEDASFOFLOW．FIRST，THEAVIATIONRISKSINCLUDINGTHEPOTENTIALACCIDENTANDTHEAVIATIONACCIDENTSAREANALYZEDANDEVALUATEDTORECOGNIZEANDDETERMINETHEMOSTDANGEROUSFAATORSOFAVIATIONRISKTHISWASDONEBYADOPTINGTHESYSTEMATICALVIEWPOINTANDMETHODINACCORDANTEWITHTHERELATEDCRITERIAOFINTERNATIONALCIVILAVIATIONORGANIZATIONANDTHERELATEDREGULATIONSANDRULESOFTHEGENERALADMINISTRAFIONOFCIVILAVIATIONOFCHINA，THENTHEMATHEMATICSMODELTHATCANBEUSEDTOSETUPADATABASEOF

簡(jiǎn)介：天津大學(xué)碩士學(xué)位論文活塞式航空煤油發(fā)動(dòng)機(jī)燃燒特性及爆震控制的研究J支ESEARCN0NC0MBUSTLONCNARACTERLSTLCS1H●一一』●J■J■J■ANDKNOCKCONTROLFORDIRECTINJECTIONPISTONAVIATIONKEROSENEENGINE一級(jí)學(xué)科學(xué)科專業(yè)作者姓名指導(dǎo)教師動(dòng)力工程及工程熱物理動(dòng)力機(jī)械及工程王書典胡春明高級(jí)工程師天津大學(xué)機(jī)械工程學(xué)院二零一五年十二月一令一丑手T一月中文摘要航空煤油具有較高的閃點(diǎn)和不易揮發(fā)的特性，在低溫下遇明火不易點(diǎn)燃，易于存儲(chǔ)和運(yùn)輸，近年來燃用航空煤油的活塞航空發(fā)動(dòng)機(jī)的研究得到了國(guó)內(nèi)外無人機(jī)及軍用領(lǐng)域的高度重視。但航空煤油與汽油的理化特性有明顯區(qū)別，使得二者在燃燒方特性上有諸多差異，并且航空煤油在大負(fù)荷工況下極易發(fā)生爆震。因此，開展活塞式航空煤油發(fā)動(dòng)機(jī)燃燒特性方面的研究，并尋求抑制航空煤油爆震的方法，具有十分重要的意義。本文在低壓空氣輔助直噴活塞式航空發(fā)動(dòng)機(jī)上進(jìn)行相關(guān)燃燒特性實(shí)驗(yàn)，分析了不同噴射時(shí)刻、點(diǎn)火提前角、過量空氣系數(shù)對(duì)航空煤油直噴發(fā)動(dòng)機(jī)燃燒特性的影響。研究表明缸內(nèi)噴射開始時(shí)刻對(duì)油滴的蒸發(fā)擴(kuò)散和均質(zhì)混合氣的形成有比較明顯的影響，冷卻水溫度對(duì)航空煤油混合氣形成及濃度分布的影響要大于汽油。航空煤油火焰?zhèn)鞑ニ俣缺绕吐?，偏離最佳點(diǎn)火正時(shí)對(duì)航空煤油熱效率的影響大于汽油；航空煤油比汽油更加適合在較濃的混合氣下燃燒，在過量空氣系數(shù)為O．8．O．85的范圍內(nèi)，航空煤油的滯燃期最短，燃燒循環(huán)變動(dòng)最小。在同一臺(tái)直噴發(fā)動(dòng)機(jī)上采用加濃混合氣、推遲點(diǎn)火、雙火花塞點(diǎn)火、分層當(dāng)量比混合氣等方式進(jìn)行抑制爆震的試驗(yàn)。研究表明通過混合氣加濃，降低燃燒溫度來抑制爆震的方式基本沒有效果；推遲點(diǎn)火雖能有效抑制爆震，但需要以損失熱效率和輸出功率為代價(jià)；采用雙火花點(diǎn)火能夠有效的提高火焰的傳播速度，但抑制爆震的效果并不理想；采用基于兩次噴射的分層燃燒模式可以有效降低發(fā)動(dòng)機(jī)的爆震強(qiáng)度，但隨著第二次噴射相位推遲和第二次噴油量增多，使得濃混合區(qū)的混合氣分布越發(fā)不均勻，這將使得火焰?zhèn)鞑ニ俣认陆?，燃燒惡化。關(guān)鍵詞活塞式航空發(fā)動(dòng)機(jī)；航空煤油；燃燒特性；抗爆性；分層當(dāng)量比混合氣；

簡(jiǎn)介：ATHESISSUBMITTEDTOZHENGZHOUUNIVERSITYFORTHEDEGREEOFMASTERFAULTDIAGNOSISOFAVIONICDEVICESBASEDONINFORMATIONFUSIONTECHNOLOGYBYXIUJIEHUSUPERVISORPROFJIAYOUSONGMICROELECTRONICSANDSOLIDSTATEELECTRONICSLNFORMATIONENG“。SCHOOLENRMEERMZCHOOLMAY2014摘要航電設(shè)備是現(xiàn)代化戰(zhàn)斗機(jī)的重要組成部分。隨著科學(xué)技術(shù)的迅猛發(fā)展，航電設(shè)備變得越來越復(fù)雜，傳統(tǒng)意義上的故障診斷方法已經(jīng)不能滿足現(xiàn)實(shí)需求。信息融合技術(shù)能夠綜合多個(gè)信息源提供的冗余和互補(bǔ)信息，獲得對(duì)被診斷對(duì)象全面、準(zhǔn)確的信息，得到更精確的判斷。本文將信息融合技術(shù)用于航電設(shè)備故障診斷研究中，構(gòu)建了一種基于模糊神經(jīng)網(wǎng)絡(luò)和D。S證據(jù)理論決策融合的故障診斷方法。針對(duì)神經(jīng)網(wǎng)絡(luò)和模糊理論表現(xiàn)的不足性和互補(bǔ)性，信息融合特征級(jí)部分采用了結(jié)合兩者優(yōu)點(diǎn)的模糊神經(jīng)網(wǎng)絡(luò)結(jié)構(gòu)。對(duì)于隨著輸入?yún)⒘康脑龆?，網(wǎng)絡(luò)結(jié)構(gòu)變得復(fù)雜而導(dǎo)致的網(wǎng)絡(luò)泛化能力差的缺點(diǎn)，將聚類算法引入結(jié)構(gòu)中，進(jìn)行結(jié)構(gòu)優(yōu)化。采用一個(gè)實(shí)例進(jìn)行故障診斷，通過與BP結(jié)構(gòu)、RBF結(jié)構(gòu)的比較，表明此種結(jié)構(gòu)方法的學(xué)習(xí)速度快、診斷精度高。針對(duì)故障診斷的不確定性，信息融合決策級(jí)部分采用了DS證據(jù)理論方法。對(duì)于證據(jù)理論中證據(jù)之間的高沖突情況下無法獲得正確結(jié)果現(xiàn)象，提出了兩級(jí)修改證據(jù)源的方法。第一級(jí)修改是在基本概率賦值的獲取過程中，基于特征級(jí)輸出各模式正確率的改進(jìn)方法；第二級(jí)修改是對(duì)證據(jù)出現(xiàn)高沖突的情況，基于證據(jù)之間貼近度的修改方法。最后，用實(shí)例驗(yàn)證了該方法的有效性。為了進(jìn)一步提高網(wǎng)絡(luò)泛化能力，根據(jù)參數(shù)空間將一個(gè)大規(guī)模模糊神經(jīng)網(wǎng)絡(luò)劃分為若干個(gè)小規(guī)模模糊神經(jīng)網(wǎng)絡(luò)。模糊神經(jīng)網(wǎng)絡(luò)可以解決DS證據(jù)理論中基本概率賦值獲取難的缺點(diǎn)，而證據(jù)理論可以綜合多子模糊神經(jīng)網(wǎng)絡(luò)輸出的冗余性，將兩者綜合起來使用，可以發(fā)揮各自的優(yōu)點(diǎn)和長(zhǎng)處。最后以航空電臺(tái)為例，驗(yàn)證了多子模糊神經(jīng)網(wǎng)絡(luò)局部融合和DS證據(jù)理論決策融合的診斷方法具有高的正確率和精確度。關(guān)鍵詞故障診斷航電設(shè)備信息融合模糊理論神經(jīng)網(wǎng)絡(luò)DS證據(jù)理論

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簡(jiǎn)介：南京航空航天大學(xué)碩士學(xué)位論文推挽雙向電流源高頻環(huán)節(jié)航空靜止變流器分析與實(shí)現(xiàn)姓名陳兆嶺申請(qǐng)學(xué)位級(jí)別碩士專業(yè)電力電子與電力傳動(dòng)指導(dǎo)教師陳道煉200121ABSTRACTTHEPRESENTSTATUS,DEVELOPMENTTRENDFORHIGHFREQUENCYLINKHFLINVERTERTECHNOLOGYANDAERONAUTICALSTATICINVERTERASIAREPRESENTEDINTHETHESIS．THEADVANTAGES，SHORTCOMINGSANDAPPLICATIONSOFSOMEIMPORTANTCKCUITSAREDISCUSSED，ANDTHECIRCUITTOPOLOGYOFTHEPUSHPULLCURRENTMODEHIGHFREQUENCYLINKASIISINTRODUCEDINTHETHESIS．TBEACADEMICFOUNDATION,CIRCUITTOPOLOGY,OPERATIONPRINCIRLEANDCONTROLSCHEMEOFTHEPUSHPULLCURRENTMODEHIGHFREQUENCYLINKASIAREDISCUSSEDINDETAIL．TLLESIMULATIONRESUKSANDEXPERIMENTALPROTOTYPEOFTHEASIAREALSOGIVENTOVERIFYTHEABOVEDESCRIPTIONS．THEABOVERESEARCHESDEMONSTRATETHATTHEPUSHPULLCURRENTMODEHIGHFREQUENCYLINKASINOTONLYOVERCOMETHEINHERENTVOLTAGESURGESHORTCOMINGOFVOLTAGEMODEHFLINVERTERS，BUTALSOHAVESIMPLETOPOLOGY,LESSCOMPONENTS，SIMPLECONTROL，EXPEDIENTDEBUGGING，GOODSTATICCHARACTERISTICANDGOODDYNAMICRESPONSE．THEREFORETHEPUSHPULLCURRENTMODEHIGHFREQUENCYLINKASIHAVEBETTERAPPLICATIONPROSPECTINLOWINPUTVOLTAGEANDLOWPOWERAPPLICATIONS．KEYWORDSPUSHPULL，HIGHFREQUENCY,CURRENTMODE，INVERTER，AERONAUTICALSTATICINVERTER2

簡(jiǎn)介：中圖分類號(hào)V2636論文編號(hào)102870715S047學(xué)科分類號(hào)082304碩士學(xué)位論文基于孔探圖像分析的航空發(fā)動(dòng)機(jī)故障診斷專家系統(tǒng)研究研究生姓名李華學(xué)科、專業(yè)載運(yùn)工具運(yùn)用工程研究方向航空器監(jiān)測(cè)、診斷與健康管理指導(dǎo)教師陳果教授南京航空航天大學(xué)研究生院民航學(xué)院二О一五年三月承諾書本人鄭重聲明所呈交的學(xué)位論文，是本人在導(dǎo)師指導(dǎo)下，獨(dú)立進(jìn)行研究工作所取得的成果。盡我所知，除文中已經(jīng)注明引用的內(nèi)容外，本學(xué)位論文的研究成果不包含任何他人享有著作權(quán)的內(nèi)容。對(duì)本論文所涉及的研究工作做出貢獻(xiàn)的其他個(gè)人和集體，均已在文中以明確方式標(biāo)明。本人授權(quán)南京航空航天大學(xué)可以有權(quán)保留送交論文的復(fù)印件，允許論文被查閱和借閱可以將學(xué)位論文的全部或部分內(nèi)容編入有關(guān)數(shù)據(jù)庫進(jìn)行檢索，可以采用影印、縮印或其他復(fù)制手段保存論文。保密的學(xué)位論文在解密后適用本承諾書作者簽名日期

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