簡介：合肥工業(yè)大學(xué)碩士學(xué)位論文航空發(fā)動機(jī)主軸軸承保持架動平衡技術(shù)研究姓名李立堂申請學(xué)位級別碩士專業(yè)機(jī)械工程指導(dǎo)教師趙韓馬純民20030401RESEARCHONDYNAMLCBALANCETECHNOLOGYOFCAGEINEAROSPACEENGINEMANQSHAFEBEARINGABSTRACTUNDERHIGHSPEEDCONDITION，IFTHECAGEOFAEROSPACEENGINEMAINSHAFTBEAINGCAN’TBEBALANCEITSUNBALANCEWILLHAVEDETRIMENTALEFFECTONBEARING．THISWILLINFLUENCEBEARINGLIFEANDRELIABILILY．THETECHNOLOGYOFDYNAMICBALANCEOFCAGEINAEROSPACEENGINEMAINSHAFEBEARINGISWIDELYUSEDINTHEPRODUTIONINDEVELOPEDCOUNTRY．INOURCOUNTRYTHISTECHNOLOGYISSTILLAVACANT．THISPAPERANALYZETHETHEORYOFDYNAMICBALANCEOFTHECAGEBYMEANSOFPIERCINGMANDREL，ANDPERFORMDYNAMICBALANCETESTINSIMPLECAGESTRUCTURETODEMONSTRATETHEDYNAMICBALANCEFEASIBITITYOFCAGEBYMEANSOFPIERCINGMANDREL．THREEINSTALLEDTHEMETHODSRESEARCHEDANDTESTEDINTHISPAPERTOSHOWTHEASSEMBLEDAPPLIANCEOFTHECAGEISSIMPLEINSTRUCTUREANDEASYTOMOUNT．THISPAPERRESEARCHANDCONFIRMREVOLVINGPOSITIONBALANCEMETHODINREVERSEDIRECTIONWHICHISSUITABLEFORSMALLBATCHPRODUCTIONANDDEVELOPSPECIALCAGEDYNAMICBALANCEMACHINESUITABLEFORMASSBATCHPRODUCTIONOFENTERPRISE．KEYWORDSAEROSPACEENGINEBEARINGCAGEDYNAMICBALANCEDYNAMICBALANCEMACHINE

簡介：基于可靠性分析的航天精密機(jī)電組件基于可靠性分析的航天精密機(jī)電組件高加速應(yīng)力篩選試驗設(shè)計高加速應(yīng)力篩選試驗設(shè)計作者姓名作者姓名徐萌萌徐萌萌導(dǎo)師姓名、職稱導(dǎo)師姓名、職稱馬洪波副教授馬洪波副教授一級學(xué)科一級學(xué)科機(jī)械工程機(jī)械工程二級學(xué)科二級學(xué)科機(jī)械制造及其自動化機(jī)械制造及其自動化申請學(xué)位類別申請學(xué)位類別工學(xué)碩士工學(xué)碩士提交學(xué)位論文日期提交學(xué)位論文日期20142014年1212月107011070112041219001204121900TN82TN82V416V416公開公開西安電子科技大學(xué)西安電子科技大學(xué)碩士學(xué)位論文碩士學(xué)位論文基于可靠性分析的航天精密機(jī)電組件基于可靠性分析的航天精密機(jī)電組件高加速應(yīng)力篩選試驗設(shè)計高加速應(yīng)力篩選試驗設(shè)計作者姓名作者姓名徐萌萌一級學(xué)科一級學(xué)科機(jī)械工程二級學(xué)科二級學(xué)科機(jī)械制造及其自動化學(xué)位類別學(xué)位類別工學(xué)碩士指導(dǎo)教師姓名、職稱指導(dǎo)教師姓名、職稱馬洪波副教授提交日期提交日期2014年12月學(xué)校代碼學(xué)校代碼分類分類號學(xué)號密級

簡介：學(xué)校代碼10406分類號V2636學(xué)號120085201012南昌航空大學(xué)南昌航空大學(xué)碩士學(xué)位論文（專業(yè)學(xué)位研究生）基于網(wǎng)格細(xì)化小波聚類的航基于網(wǎng)格細(xì)化小波聚類的航空發(fā)動機(jī)轉(zhuǎn)子系統(tǒng)故障診斷空發(fā)動機(jī)轉(zhuǎn)子系統(tǒng)故障診斷碩士研究生丁偉明導(dǎo)師劉曉波教授申請學(xué)位級別碩士學(xué)科、專業(yè)機(jī)械工程所在單位航空制造工程學(xué)院答辯日期2015年5月授予學(xué)位單位南昌航空大學(xué)I摘要隨著我國國民經(jīng)濟(jì)實力的增強和國際地位的日益提高，現(xiàn)代航空事業(yè)的發(fā)展步伐逐步加快飛機(jī)發(fā)動機(jī)性能在不斷提高的同時，航空發(fā)動機(jī)結(jié)構(gòu)設(shè)計日益繁雜，發(fā)生各種故障的概率隨之上升，所以對于它的穩(wěn)定性和可靠性的要求也會越來越高。轉(zhuǎn)子系統(tǒng)振動故障是造成航空發(fā)動機(jī)故障的主要原因之一，當(dāng)轉(zhuǎn)子系統(tǒng)發(fā)生故障時，通常會導(dǎo)致嚴(yán)重的振動問題，甚至導(dǎo)致機(jī)毀人亡的事故發(fā)生。因此，對于轉(zhuǎn)子系統(tǒng)進(jìn)行故障診斷研究，不僅具有重要的學(xué)術(shù)價值，而且對國民經(jīng)濟(jì)以及國家安全都有著重要的現(xiàn)實意義。本文將小波聚類算法作為轉(zhuǎn)子系統(tǒng)振動故障診斷方法，在MATLAB環(huán)境下，對故障診斷準(zhǔn)確度即聚類精度進(jìn)行分析之后，為了能夠更加準(zhǔn)確地判斷出故障類型、提高聚類精度，提出了網(wǎng)格細(xì)化的小波聚類算法，即將網(wǎng)格拆分技術(shù)運用到小波聚類算法，對算法運行過程中的特征空間網(wǎng)格單元進(jìn)行“網(wǎng)格細(xì)化”以此來對邊界點進(jìn)行提取，最后對改進(jìn)前后算法的聚類精度進(jìn)行理論研究和實驗驗證。在本文中，首先闡述了課題研究的目的及意義，對于航空發(fā)動機(jī)故障診斷的國內(nèi)外現(xiàn)狀與發(fā)展趨勢進(jìn)行了大概的描述；其次，對于航空發(fā)動機(jī)進(jìn)行了分類，并介紹了幾種航空發(fā)動機(jī)，對于轉(zhuǎn)子系統(tǒng)振動幾種常見故障的原因與故障發(fā)生時所體現(xiàn)的特征進(jìn)行了詳細(xì)介紹。第三，在了解小波聚類算法基本原理的基礎(chǔ)上提出了改進(jìn)的具體方法，即采用網(wǎng)格細(xì)化對其進(jìn)行改進(jìn)。第四，詳細(xì)介紹了網(wǎng)格拆分技術(shù)以及選取的二維特征量。最后，介紹了轉(zhuǎn)子系統(tǒng)故障模擬實驗裝置和幾種常見振動故障的實驗方法，進(jìn)行轉(zhuǎn)子故障模擬實驗，根據(jù)采集到的轉(zhuǎn)子故障數(shù)據(jù)來驗證改進(jìn)后的小波聚類算法的可行性及有效性。由實驗結(jié)果可以得到網(wǎng)格細(xì)化小波聚類算法比改進(jìn)前的聚類精度更高，轉(zhuǎn)子系統(tǒng)振動故障診斷準(zhǔn)確度更高。關(guān)鍵詞關(guān)鍵詞航空發(fā)動機(jī)，轉(zhuǎn)子系統(tǒng)，小波聚類，網(wǎng)格細(xì)化，故障診斷

簡介：電子科技大學(xué)UNIVERSITYOFELECTRONICSCIENCEANDTECHNOLOGYOFCHINA碩士學(xué)位論文MASTERTHESIS（電子科技大學(xué)圖標(biāo)）論文題目航空發(fā)動機(jī)高壓渦輪轉(zhuǎn)子系統(tǒng)航空發(fā)動機(jī)高壓渦輪轉(zhuǎn)子系統(tǒng)可靠性研究可靠性研究學(xué)科專業(yè)機(jī)械電子工程機(jī)械電子工程學(xué)號201221080202作者姓名王齊指導(dǎo)教師黃洪鐘教授RESEARCHONRELIABILITYOFHIGHPRESSURETURBINEROTORSYSTEMINAEROENGINESAMASTERTHESISSUBMITTEDTOUNIVERSITYOFELECTRONICSCIENCEANDTECHNOLOGYOFCHINAMAJORMECHANICALELECTRONICENGINEERINGAUTHORQIWANGADVISORPROFHONGZHONGHUANGSCHOOLSCHOOLOFMECHATRONICSENGINEERING

簡介：西北工業(yè)大學(xué)碩士學(xué)位論文航空泵用無位置傳感器無刷直流電動機(jī)控制技術(shù)研究姓名廖東泉申請學(xué)位級別碩士專業(yè)航空工程指導(dǎo)教師馬瑞卿鄧先仲20040801西北」_業(yè)大學(xué)碩上論文摘要ABSTRACTIHISPAPERAGAINSTTHEBRUSHDCMOTORFORAVIATIONPUMPATCURRENTUSEINCHINAWHICHHASSHORTSERVICELIFELOWERRELIABILITYANDCONDITIONNOTTOSATIS行THEDEVELOPINGREQUIREMENTOFAVIATIONFIELDSTAKINGMODERNBLDCMASSUBJECTINVESTIGATEDUSESPOSITIONSENSORLESSCONTROLMETHODTOREALIZEBLDCMDRIVINGANDCLOSELOOPCONTROLFORAVIATIONPUMPOFAIRCRAFTTHISPAPERANALYSESANDSTUDIESTHEWORKPRINCIPLEOFRAREEARTHPERMANENTMAGNETICBRUSHLESSDCMOTORACROSSINGZERODETERMININGMETHODOFTHEBACKELECTROMOTIVEFORCEEMFANDTHESOFTSTARTTECHNIQUEUSINGTHEROTORPOSITIONEXAMINEDBEFORESTARINGANDREALIZESTHEEXTERNALSYNCHRONIZEDRELIABLESTARTOFMOTORTHISMETHODCANDRIVETHEPROPERWINDINGSTOPRODUCEDESIREDROTATIONANDREDUCETHESTARTTIMEINTHISPAPERADUCS12SINGLECHIPMICROCOMPUTERISADAPTEDASCORECONTROLUNITANDTHESMOOTHSWITCHINGFROMTHEEXTERNALSYNCHRONIZEDOPERATIONTOTHEOWNSYNCHRONIZEDOPERATIONISFULLYRESOLVEDBYPULSEWIDTHMODULATIONPWMMODEMEANWHILETHEINDIRECTCLOSELOOPCONTROLOFMOTORSPEEDISREALIZEDBYTHEROTORPOSITIONSENSORLESSSIGNALBYDISCOVERYOFRESEARCHACCORDINGTOCHARACTERSOFTHEAVIATIONPUMPMOTORTHISMOTORSTARTEQUALSTOTHEZEROLOADSOITVERYSUITSFORTHEAVIATIONPUMPATTHESAMETIMEBECAUSETHEMOTORUSESELECTRICCOMMUTATIONITCANOVERCOMEMANYSHORTAGESOFMACHINECOMMUTATIONOFTHESHORTNESSOFBRUSHDCMOTORTESTSSHOWTHATTHEMOTORHAVESMALLVOLUMEHIGHRELIABILITYSTABLYANDFASTSTARTABILITYSMALLSTARTCURRENTWIDERAREAOFSPEEDADJUSTINGANDHARDMACHINECHARACTERISTICITCANSATISFYALLTHEREQUIREMENTOFAVIATIONBUMPMOTORANDWILLBUILDTHEFOUNDATIONFORAPPLICATIONOFAVIATIONPUMPDRIVINGMOTORKEYWORDSAVIATIONOPERATIONPUMPSENSORLESSBRUSHLESSDCMOTOREXTERNALSYNCHRONIZEDEMFOWNSYNCHRONIZEDOPERATIONSINGLECHIPMICROCOMPUTERSPEEDCLOSELOOPCONTROL

簡介：山東大學(xué)碩士學(xué)位論文航空模型螺旋槳的氣動性能分析姓名楊曉玲申請學(xué)位級別碩士專業(yè)機(jī)械工程指導(dǎo)教師王勇20061115山東大學(xué)1稃碩士學(xué)位論文AERODYNAMICPROPERRYANALYSIS0FAIRCRAFRMODELPROPELLERABSTRACTINORDERTOIMPROVETHEDESIGNTECHNIQUEANDTHEAERODYNAMICPERFORMANCEOFUAVPROPELLERS，MODEMCOMPUTATIONALFUILDDYNAMIESCFDISINTRODUCEDINTOTHEPROPELLERDESIGNPROCESSANDFLOWANALYSISINTHISTHESIS．MAINRESEARCHWORKCARRIEDOUTINCLUDESTHEFOLLOWINGBASEDONTHELIFTSURFACEMETHODWITHUNDISTORTEDWAKEMODEL，ALIFTSURFACEMETHODWITHAFREEWAKEMODELESTABLISHEDANDTHECOMPUTERCODETOPREDICTTHEPERFORMANCEOFPROPELLERSISDEVELOPEDINWHICHTHEVELOCITYINDUCEDBYVORTEXCOREISTAKENINTOACCOUNTANDANITERATERELAXATIONALGORITHMOFTHEFREEWAKECALCULATIONISCONSTRUCTED．EXAMPLESSHOWTHATTHENUMERICALRESULTSAREINGOODAGREEMENTWITHEXPERIMENTALDATAAVAILABLEANDTHECAPACITYISSUCCESSFULLYEXTENDEDTOHEAVYLOADEDPROPELLER．AMOREACCURATEMETHODBASEDONTHEVORTEXTHEORY,TAKINGACCOUNTOFTHEEFFECTSOFCOMPRESSIBILITYANDTHENUMBEROFBLADESISESTABLISHEDANDACOMPUTERCODEISDEVELOPED．BASEDONTHECONDITIONFORBETZ’SMINIMUMENERGYLOSS，AOPTIMALDESIGNCODEOFPROPELLERISDEVELOPED．EXAMPLEISFOUNDTOBEMUCHSATISFACTORY．BYMEANSOFTHEABOVECFDCODES，THEAERODYNAMICPERFORMANCEOFAUAVPROPELLERISEXAMINEDANDTHETECHNOGICALAPPROACHOFIMPROVINGTHEEFFICIENCYOFTHISPROPELLERISRAISED．THERESULTSOFANALYSISSHOWTHATCOMPRESSIBLEEFFECTCANMAKE9．5％TO12％REDUCTIONOFTHEPROPELLEREFFICIENCYATDESIGNPOINT．THEWAKECONTRACTIONREACHES10％ATADVANCEDRATIOOF0．2，ANDTHELOSSOFSTRONGSHOCKANDVISCOUSEFFECTDUETOTHEONLYAIRFOILCONTOURBLADESEAMSTOBETHEMAINSEASONRESPONSIBLETOTHELOWEFFICIENCYOFTHISPROPELLER．RESULTSANDEXAMPLESSUGGESTTHATTHECFDMETHODSDEVELOPEDINTHETHESIS

簡介：南昌航空大學(xué)碩士學(xué)位論文航空發(fā)動機(jī)潤滑系統(tǒng)通用分析軟件算法研究、數(shù)據(jù)庫及界面開發(fā)姓名李靜申請學(xué)位級別碩士專業(yè)航空宇航制造工程指導(dǎo)教師王琦20080401南昌航空大學(xué)碩士學(xué)位論文目錄VIIIABSTRACTTHEKEYTECHNOLOGIESOFGENERALANALYSISSOFTWAREFAEROENGINELUBRICATIONSYSTEMARESTUDIEDWHICHINCLUDINGACTERISTICALGITHMOFTYPICALELEMENTFLUIDWKALGITHMGRAPHICMODELINGDATABASETHEPAPERGIVESTHERMOANALYSISALGITHMOFEACHTYPICALELEMENTINLUBRICATIONSYSTEMBASEDONTHEDESIGNCONCEPTSOFTHETYPICALELEMENTTHECOMPUTERPROCEDUREMODULEOFTHETYPICALELEMENTHASBEENDEVELOPEDINTHEPROCESSOFMODELBUILDINGTHESTRUCTURECHAMBERSOFTHESYSTEMISDIVIDEDINTODIFFERENTCOMPONENTSTHENSYMBOLIZEDBYDIAGRAMMATICSKETCHESFURTHERCONNECTEDINTOASYSTEMTHROUGHNODALSANODALPRESSURERESIDUALCRECTIONMETHODBASEDONTHEDESIGNCONCEPTSOFELEMENTNODEHASBEENUSEDINTHERESEARCHOFFLUIDWKALGITHMAFLUIDWKCALCULATIONMODULEWHICHHASRELATIVELYHIGHPRECISIONGOODCONVERGENCEHASBEENDEVELOPEDTHEWKAUTOIDENTIFICATIONTECHNOLOGYTECHNOLOGYBASEDONTHEEQUIPMENTINTERFACEMETHODHASBEENADOPTEDINTHERESEARCHOFTHEGRAPHICMODELINGTHESOFTWAREWEREDEVELOPEDONTHEPLATFMOFDELPHI7WHILEOBJECTIENTEDVISUALIZATIONTECHNOLOGYWEREADOPTEDINTHISPAPERFRIENDLYMANMACHINEINTERFACECONVENIENTDATABASEMANAGEMENTSYSTEMHASBEENSTUDIEDATTHEENDOFTHISPAPERSOMEPROJECTCASEHASBEENDISIGNEDVALIDATIONUSINGTHISSOFTWARETHEPREDICTEDRESULTSAGREEWELLWITHTHEREQUIRMENTSWHICHSHOWSTHATTHESOFTWARECANSATISFYTHEREQUIREMENTSOFENGINEERINGDESIGNANALYSISKEYWDSLUBRICATIONSYSTEMFLUIDWKALGITHMGRAPHICMODELINGWKAUTOIDENTIFICATIONNODALS

簡介：中圖分類號THL422UDC』墊學(xué)校代碼密級碩士專業(yè)學(xué)位論文10533航空用7075鋁合金蠕變時效工藝及其抗腐蝕行為的研究ASTUDYONTHECREEPAGINGPROCESSINGANDCORROSIONRESISTANCEOF7075ALUMINUMALLOY作者姓名學(xué)科專業(yè)研究方向?qū)W院系、所指導(dǎo)教師姜玉強機(jī)械工程機(jī)械設(shè)計制造及其自動化機(jī)電工程學(xué)院藺永誠教授論文答辯日期坦生』17答辯委員會主席中南大學(xué)2014年5月航空用7075鋁合金蠕變時效工藝及其抗腐蝕行為的研究摘要現(xiàn)代航空航天裝備不斷地向著輕量化，長壽命，高可靠性方向發(fā)展，服役性能也日趨極端化。研究和制造具有復(fù)雜結(jié)構(gòu)的高性能輕合金整體構(gòu)件是航空航天裝備跨越式發(fā)展的有效途徑之一。蠕變時效成形是利用鋁合金材料的蠕變特性和人工時效原理，將蠕變成形和人工時效同步進(jìn)行的一種先進(jìn)的現(xiàn)代材料成形技術(shù)。本文針對我國輕合金整體機(jī)翼壁板成形技術(shù)相對薄弱的現(xiàn)狀，研究了航空用7075鋁合金的蠕變時效特性。本文的主要研究內(nèi)容和研究成果如下1通過單軸拉伸蠕變實驗，獲得了7075鋁合金的高溫蠕變特性，研究了蠕變時效工藝參數(shù)對7075鋁合金蠕變時效特性的影響規(guī)律。結(jié)果表明蠕變時效工藝參數(shù)對材料的蠕變時效行為有著顯著的影響，材料的蠕變應(yīng)變隨著蠕變時效溫度的升高和外加應(yīng)力的增大而增大。基于陳化理論和0本構(gòu)模型，建立了7075鋁合金的蠕變本構(gòu)方程，該模型可以準(zhǔn)確地描述蠕變應(yīng)變隨時間的變化關(guān)系。2通過掃描電子顯微鏡SEM和透射電子顯微鏡TEM實驗，研究了蠕變時效工藝對材料微觀組織演變的影響規(guī)律。結(jié)果表明7075鋁合金中粗大第二相A1，CUFE和MGSI和中等尺度第二相A1。。MG，CR2和A1，ZR均勻地分布在鋁基體中，蠕變時效工藝對粗大、中等尺度的第二相沒有顯著的影響；7075鋁合金中主要時效強化相是TF和N相，時效強化相隨蠕變時效溫度的升高和外加應(yīng)力的增大而逐漸析出和長大；隨著蠕變時效溫度的升高和外加應(yīng)力的增大，晶界析出相由連續(xù)分布逐漸轉(zhuǎn)化為非連續(xù)分布，晶界無析出帶的寬度也逐漸增大；和無應(yīng)力時效相比，蠕變時效可以細(xì)化晶內(nèi)強化相，減小晶界無析出帶的寬度。3通過電化學(xué)腐蝕實驗、剝落腐蝕實驗和金相實驗，研究了蠕變時效工藝對7075鋁合金抗腐蝕性能的影響規(guī)律。結(jié)果表明蠕變時效工藝改變了7075鋁合金中析出相的大小和分布，進(jìn)而影響了材料的抗腐蝕性能。在實驗的溫度范圍內(nèi)，隨著蠕變時效溫度的升高，材料的抗腐蝕性能首先提高，然后降低，當(dāng)蠕變時效溫度為393K時，7075鋁合金的抗腐蝕性能最好。此外，外加應(yīng)力也會影響材料的抗腐蝕性能，當(dāng)外加應(yīng)力為230MPA時，材料有著較好的抗腐蝕性能。4通過以上研究發(fā)現(xiàn)，當(dāng)蠕變時效溫度為393K時，7075鋁合金析出相的大小和分布比較合理，材料的抗腐蝕性能較好，適合于大型輕合金整體薄壁構(gòu)件的蠕變時效成形工藝。II

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