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簡(jiǎn)介：學(xué)校代碼10406分類號(hào)V2636學(xué)號(hào)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(dòng)機(jī)轉(zhuǎn)子系統(tǒng)故障診斷空發(fā)動(dòng)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(qǐng)學(xué)位級(jí)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(guó)國(guó)民經(jīng)濟(jì)實(shí)力的增強(qiáng)和國(guó)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(dòng)機(jī)性能在不斷提高的同時(shí)，航空發(fā)動(dòng)機(jī)結(jié)構(gòu)設(shè)計(jì)日益繁雜，發(fā)生各種故障的概率隨之上升，所以對(duì)于它的穩(wěn)定性和可靠性的要求也會(huì)越來(lái)越高。轉(zhuǎn)子系統(tǒng)振動(dòng)故障是造成航空發(fā)動(dòng)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(shí)，通常會(huì)導(dǎo)致嚴(yán)重的振動(dòng)問(wèn)題，甚至導(dǎo)致機(jī)毀人亡的事故發(fā)生。因此，對(duì)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(jià)值，而且對(duì)國(guó)民經(jīng)濟(jì)以及國(guó)家安全都有著重要的現(xiàn)實(shí)意義。本文將小波聚類算法作為轉(zhuǎn)子系統(tǒng)振動(dòng)故障診斷方法，在MATLAB環(huán)境下，對(duì)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(yùn)用到小波聚類算法，對(duì)算法運(yùn)行過(guò)程中的特征空間網(wǎng)格單元進(jìn)行“網(wǎng)格細(xì)化”以此來(lái)對(duì)邊界點(diǎn)進(jìn)行提取，最后對(duì)改進(jìn)前后算法的聚類精度進(jìn)行理論研究和實(shí)驗(yàn)驗(yàn)證。在本文中，首先闡述了課題研究的目的及意義，對(duì)于航空發(fā)動(dòng)機(jī)故障診斷的國(guó)內(nèi)外現(xiàn)狀與發(fā)展趨勢(shì)進(jìn)行了大概的描述；其次，對(duì)于航空發(fā)動(dòng)機(jī)進(jìn)行了分類，并介紹了幾種航空發(fā)動(dòng)機(jī)，對(duì)于轉(zhuǎn)子系統(tǒng)振動(dòng)幾種常見(jiàn)故障的原因與故障發(fā)生時(shí)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(duì)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(shí)驗(yàn)裝置和幾種常見(jiàn)振動(dòng)故障的實(shí)驗(yàn)方法，進(jìn)行轉(zhuǎn)子故障模擬實(shí)驗(yàn)，根據(jù)采集到的轉(zhuǎn)子故障數(shù)據(jù)來(lái)驗(yàn)證改進(jìn)后的小波聚類算法的可行性及有效性。由實(shí)驗(yàn)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(dòng)故障診斷準(zhǔn)確度更高。關(guān)鍵詞關(guān)鍵詞航空發(fā)動(dòng)機(jī)，轉(zhuǎn)子系統(tǒng)，小波聚類，網(wǎng)格細(xì)化，故障診斷

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簡(jiǎn)介：山東大學(xué)碩士學(xué)位論文航空模型螺旋槳的氣動(dòng)性能分析姓名楊曉玲申請(qǐng)學(xué)位級(jí)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

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簡(jiǎn)介：中圖分類號(hào)THL422UDC』墊學(xué)校代碼密級(jí)碩士專業(yè)學(xué)位論文10533航空用7075鋁合金蠕變時(shí)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(qiáng)機(jī)械工程機(jī)械設(shè)計(jì)制造及其自動(dòng)化機(jī)電工程學(xué)院藺永誠(chéng)教授論文答辯日期坦生』17答辯委員會(huì)主席中南大學(xué)2014年5月航空用7075鋁合金蠕變時(shí)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(zhǎng)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(shí)效成形是利用鋁合金材料的蠕變特性和人工時(shí)效原理，將蠕變成形和人工時(shí)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(duì)我國(guó)輕合金整體機(jī)翼壁板成形技術(shù)相對(duì)薄弱的現(xiàn)狀，研究了航空用7075鋁合金的蠕變時(shí)效特性。本文的主要研究?jī)?nèi)容和研究成果如下1通過(guò)單軸拉伸蠕變實(shí)驗(yàn)，獲得了7075鋁合金的高溫蠕變特性，研究了蠕變時(shí)效工藝參數(shù)對(duì)7075鋁合金蠕變時(shí)效特性的影響規(guī)律。結(jié)果表明蠕變時(shí)效工藝參數(shù)對(duì)材料的蠕變時(shí)效行為有著顯著的影響，材料的蠕變應(yīng)變隨著蠕變時(shí)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(shí)間的變化關(guān)系。2通過(guò)掃描電子顯微鏡SEM和透射電子顯微鏡TEM實(shí)驗(yàn)，研究了蠕變時(shí)效工藝對(duì)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(shí)效工藝對(duì)粗大、中等尺度的第二相沒(méi)有顯著的影響；7075鋁合金中主要時(shí)效強(qiáng)化相是TF和N相，時(shí)效強(qiáng)化相隨蠕變時(shí)效溫度的升高和外加應(yīng)力的增大而逐漸析出和長(zhǎng)大；隨著蠕變時(shí)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(wú)析出帶的寬度也逐漸增大；和無(wú)應(yīng)力時(shí)效相比，蠕變時(shí)效可以細(xì)化晶內(nèi)強(qiáng)化相，減小晶界無(wú)析出帶的寬度。3通過(guò)電化學(xué)腐蝕實(shí)驗(yàn)、剝落腐蝕實(shí)驗(yàn)和金相實(shí)驗(yàn)，研究了蠕變時(shí)效工藝對(duì)7075鋁合金抗腐蝕性能的影響規(guī)律。結(jié)果表明蠕變時(shí)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(shí)驗(yàn)的溫度范圍內(nèi)，隨著蠕變時(shí)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(shí)效溫度為393K時(shí)，7075鋁合金的抗腐蝕性能最好。此外，外加應(yīng)力也會(huì)影響材料的抗腐蝕性能，當(dāng)外加應(yīng)力為230MPA時(shí)，材料有著較好的抗腐蝕性能。4通過(guò)以上研究發(fā)現(xiàn)，當(dāng)蠕變時(shí)效溫度為393K時(shí)，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(shí)效成形工藝。II

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簡(jiǎn)介：中南大學(xué)碩士學(xué)位論文新型航空機(jī)輪防滑剎車控制器的設(shè)計(jì)與研究姓名王敬亭申請(qǐng)學(xué)位級(jí)別碩士專業(yè)控制理論與控制工程指導(dǎo)教師廖力清20060509ABSTRACTAIRCRAFTANTISKIDBRAKINGCONTROLSYSTEMISONEOFTHEKEYAIRBORNEEQUIPMENTANDPLAYSAVERYIMPORTANTROLEINTHESAFETAKEOFFANDLANDINGTHEEXSITINGANTISKIDBRAKINGCONTROLLERISMOSTLYDESIGNEDWITHANALOGCIRCUIT，ANDPICONTROLMETHODISUSUALLYAPPLIEDINITSOTHEANALOGANTISKIDBRAKINGCONTROLLERHASTHEDISADVANTAGEOFLONGRESPONSETIME，BADADAPTIVEABILITYLOWCONTROLPRECISIONANDLOWBRAKEEFFICIENCYFORTHESAKEOFTHEANALOGCIRCUITITSELFITISIMPOSSIBLETOAPPLYADVANCEDCONTROLALGORITHMINTHEANALOGANTISKIDBRAKINGCONTROLLERITISVERYMEANINGFULTESEARCHANDDESIGNTHEDIGITALANTISKIDBRAKINGCONTROLLERAPPLYINGADVANCEDCONTROLALGORITHMAIMINGATTHEDISADVANTAGEOFLONGRESPONSETIME，DIGITALSIGNALPROCESSORDSPTMS320LF2407ISAPPLIEDTODESIGNDIGITALANTISKIDBRAKINGCONTROLLERANDTHESERVOVALVEISDRIVENWITHPWMPULSEWIDTHMODULATIONCONTROLMETHODAIMINGATTHEDISADVANTAGEOFBADADPTIVEABILITYFUZZYCONTROLSTRATEGYISPRESENTEDINTHEDESIGNOFSYSTEMCONTROLSTRATEGYOWINGTOTHECOMPLEXNONLINEARITYOFTHEANTISKIDBRAKINGSYSTEMANTISKIDBRAKINGFUZZYCONTROLMODELISESTABLISHED，ONTHEBASISOFWHICH，THEFUZZYCONTROLRULESANDFUZZYCONTROLLERAREDESGINEDTHEINPUTSVARIABLESOFFUZZYCONTROLLERARETHEERROROFSLIPRATEANDITSDIFFERENTIAL，ANDTHEOUTPUTVARIABLEISTHECURRENTOFTHESERVOVALVEBECAUSEFUZZYCONTROLISMAINLYBASEDONTHEEXPERIENCEOFHUMANBEING；THEOPTIMALCONTROLISDIFFICULTTOBEOBTAINEDSELFREGULATIONFACTORSAREADOPTEDINTHEFUZZYCONTROLLERTOOPTIMIZETHECONTROLRULESTHESIMULATIONRESULTSAFTEROPTIMIZATIONAREALSOSUPPLIEDINTHISPAPERTHEANTISKIDBRAKINGCONTROLLERDESIGNEDINTHISPAPERHASALREADYPASSEDTHEGROUNDINERTIATESTTHETESTRESULTSSHOWTHATTHEHARDWAREDESIGNOFTHECONTROLLERISFEASIBLE，ANDTHEFUZZYCONTROLSTRATEGYAPPLIEDINTHECONTROLLERISCORRECTANDEFFICIENTTHEANTISKIDBRAKINGCONTROLLERWORKSWELLANDRELIABLYTHEWHOLEANTISKIDBRAKINGCONTROLSYSTEMRUNSSTABLYANDTHEPERFORMANCEOFTHESYSTEMPROVEDTOBEEXCELLENTKEYWORDSANTISKIDBRAKINGSYSTEM，F(xiàn)UZZYCONTROL，SELFREGULATIONFACTORTM320LF2407ⅡI

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