簡(jiǎn)介：南京航空航天大學(xué)碩士學(xué)位論文航空專(zhuān)用網(wǎng)格中任務(wù)調(diào)度技術(shù)的研究姓名丁瑞申請(qǐng)學(xué)位級(jí)別碩士專(zhuān)業(yè)計(jì)算機(jī)應(yīng)用技術(shù)指導(dǎo)教師莊毅20080101航空專(zhuān)用網(wǎng)格中任務(wù)調(diào)度技術(shù)的研究IIABSTRACTABSTRACTTASKSCHEDULINGISONEOFTHEGRIDKEYTECHNOLOGIESWHOSEAIMISTHATUSER’TASKREQUESTCANBEDISTRIBUTEDTOGRIDRESOURCESREASONABLYWHICHCANACHIEVETHEAIMOFPERFMINGTASKEFFICIENTLYUSINGRESOURCESREASONABLYINSPECIALAVIATIONGRIDFAIRCRAFTVIRTUALDESIGNITINVOLVESALOTOFSUPERCOMPUTERSOFMATRIXTHEDIMENSIONOFMATRIXCANREACHMULTIMILLIONTHEUSER’TASKREQUESTNEEDSHIGHRESOURCECOMPUTINGCAPABILITYINDERTOPERFMTASKEFFICIENTLYTHERESEARCHONGRIDTASKSCHEDULINGTECHNOLOGYISABSOLUTELYNECESSARYFIRSTOFALLGRIDARCHITECTUREGRIDKEYTECHNOLOGYWASSTUDIEDGRIDTASKSCHEDULINGMODELTASKSCHEDULINGPROCESSSCHEDULINGALGITHMSWEREDEEPLYDISCUSSEDTHEACTERISTICSDEFICIENCYOFCURRENTGRIDTASKSCHEDULINGALGITHMWEREANALYZEDACCDINGTOTHEREQUESTOFSPECIALAVIATIONGRIDFAIRCRAFTVIRTUALDESIGNTHESPECIALAVIATIONGRIDMULTILEVELTASKSCHEDULINGSYSTEMWASDESIGNEDITSKEYFUNCTIONMODULESWEREDESIGNEDINDETAILGEICALGITHMWASIMPROVEDFROMEACHKEYLINKBASEDONTHEANALYSISOFITSACTERISTICSDEFICIENCYCOMBINEDWITHTHEACTERISTICSOFGLOBALSCHEDULERTHEREQUESTOFLARGESCALECOMPUTINGINAIRCRAFTVIRTUALDESIGNTHEGLOBALTASKSCHEDULINGALGITHMWASDESIGNEDTHEPARALLELISMOFGEICALGITHMWASANALYZEDCOMBINEDWITHTHEACTERISTICSOFLOCALSCHEDULERTHELOCALTASKSCHEDULINGALGITHMWASDESIGNEDTHESIMULATIONEXPERIMENTWASCARRIEDOUTWITHGRIDSIMSIMULATIONTOOLTHEEXPERIMENTALRESULTSINDICATETHATTHETASKCOMPLETIONTIMERESOURCEUTILIZATIONCOSTOFIMPROVEDGEICALGITHMWEREIMPROVEDTHEGLOBUSTOOLKITWASSTUDIEDTHELOCALSCHEDULINGSUBSYSTEMWASREALIZEDINITIALLYTHEFEASIBILITYEFFECTIVENESSOFTHESUBSYSTEMBYAPRACTICALEXAMPLEINTHESPECIALAVIATIONGRIDTASKSCHEDULINGSYSTEMFAIRCRAFTVIRTUALDESIGN，KINDSOFFACTSAIMINGATGRIDCOMPUTINGRESOURCEWASCONSIDEREDTHEPERFMANCEOFGRIDTASKSCHEDULINGWASIMPROVEDITWILLMAKETHEPAVEMENTFTHEDEVELOPMENTOFTECHNOLOGIESINAIRCRAFTVIRTUALDESIGNDOMAINKEYWDSGRIDGRIDARCHITECTUREVIRTUALDESIGNTASKSCHEDULINGGEICALGITHMQUALITYOFSERVICE

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簡(jiǎn)介：分類(lèi)號(hào)UDC密級(jí)1933868學(xué)位論文航空薄壁結(jié)構(gòu)件加工變形數(shù)值仿真研究作者姓名張延成指導(dǎo)教師鞏亞?wèn)|教授申請(qǐng)學(xué)位級(jí)別學(xué)科專(zhuān)業(yè)名稱(chēng)論文提交日期學(xué)位授予日期東北大學(xué)先進(jìn)制造與自動(dòng)化技術(shù)研究所碩士學(xué)科類(lèi)別工學(xué)機(jī)械制造及其自動(dòng)化2008年1月日2008年3月日評(píng)閱人矯穡，彳不謠論文答辯日期2008年2月日答辯委員會(huì)席參1灑叫東北大學(xué)2008年2月ADISSERTATIONINMECHANICALMANUFACTURINGANDAUTOMATIONTHENUMERICALSIMULATIONSTUDYONMACHININGDEFORMATIONOFTHEAERONAUTICTHINWALLEDSTRUCTURECOMPONENTSBYZHANGYANCHENGSUPERVISORPROFESSORGONGYADONGNORTHEASTERNUNIVERSITYFEBRUARY2008

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簡(jiǎn)介：西北工業(yè)大學(xué)碩士學(xué)位論文某型航空發(fā)動(dòng)機(jī)數(shù)控仿真系統(tǒng)軟件設(shè)計(jì)研究姓名陳偉靜申請(qǐng)學(xué)位級(jí)別碩士專(zhuān)業(yè)控制理論與控制工程指導(dǎo)教師李華聰20030301西北工業(yè)大學(xué)碩學(xué)位論文ABSTRACTABSTRACTRESULTFROMTHEDEVELOPINGOFAEROPROPULSIONTECHNOLOGYANDMULTIVARIABLECONTROLTECHNOLOGYEXTRAHI曲CONTROLPRECISIONISDEMANDEDINORDERTOMEETTHEDEMAND，AEROENGINECONTROLSYSTEMBECOMESMOREANDMORECOMPLICATED，HYDRAULICSYSTEMTHATUSEDWIDELYINTHEPASTISHARDTOORCANNOTACHIEVETHATPRECISIONTHEDIGITALELECTRONICCONTROLLERCHARACTERSWITHHIGHRUNNINGSPEED，HIGHPRECISION，F(xiàn)LEXIBILITYINDESIGNINGETC，ITOVERWHELMSTHEOTHERDESIGNMETHODINAEROENGINECONTROLLERDESIGNWHATTHEPAPERDISCUSSESISPARTOFAEROEILGINEREALTIMEDIGITALELECTRONICCONTROLSIMULATIONSYSTEMTHROUGHANALYZINGTHEREQUIREMENTINTECHNOLOGYANDFUNCTIONSOFTHESYSTEM，THISPAPERPRESENTSTEEHNIQTIESTOBUILDTHESYSTEM，THEPAPERFOCUSESONSOFTWAREDESIGNING，INCLUDINGSIMULATINGDIGITALCONTROLLERCOMMUNICATINGBETWEENCOMPUTERSANDCOMPUTERWITHOTHERDEVICES，ANDGRAPHICSINTERFACEWITHUSERANDINTERFACESWITHHARDWARE，THEPROJECTCANMEETTHEREQUIREMENTFORENGINEERINGAPPLICATIONTHROU曲PRIMARYTESTINGKEYWORDSAEROENGINE，AEROENGINECONTROL，REALTIMEDIGITALELECTRONICSIMULATIONSIMULATIONSYSTEM，SOFTWAREDESIGN

簡(jiǎn)介：山東大學(xué)博士學(xué)位論文航空整體結(jié)構(gòu)件加工變形滾壓校正理論及方法研究姓名王中秋申請(qǐng)學(xué)位級(jí)別博士專(zhuān)業(yè)機(jī)械制造及其自動(dòng)化指導(dǎo)教師李劍峰孫杰20090501山東_人學(xué)博IJ學(xué)位論文釋放過(guò)程采用邊界條件轉(zhuǎn)換模擬，在底面不共線(xiàn)的三點(diǎn)施加3．2．1約束，使工件可以自由變形，獲得了夾具釋放后框類(lèi)結(jié)構(gòu)件的變形。設(shè)計(jì)了銑削實(shí)驗(yàn)，將模擬獲得的框類(lèi)結(jié)構(gòu)件的最終變形與實(shí)驗(yàn)獲相比較，驗(yàn)證了有限元模型的正確性。根據(jù)二維滾壓過(guò)程數(shù)學(xué)物理模型構(gòu)建了二維薄壁滾壓有限元仿真分析模型。分析了不同滾壓力、不同薄壁厚度下滾壓過(guò)程中材料流動(dòng)、應(yīng)力、應(yīng)變變化關(guān)系，并以切削應(yīng)力為例分析了滾壓應(yīng)力與初始應(yīng)力的相互作用關(guān)系。通過(guò)分析滾壓應(yīng)力與初始應(yīng)力的作用關(guān)系表明薄壁滾壓過(guò)程可以看作是滾壓機(jī)械應(yīng)力與初始應(yīng)力疊加的過(guò)程，該過(guò)程可以通過(guò)調(diào)整滾壓力及滾壓位使薄壁產(chǎn)生不同程度的塑性變形量及內(nèi)應(yīng)力分布。不同滾壓力對(duì)于薄壁滾壓產(chǎn)生的內(nèi)應(yīng)力分布不同當(dāng)滾壓力較低時(shí)，滾壓過(guò)程只能在淺表層產(chǎn)生較大的滾壓力壓應(yīng)力波谷，該滾壓力水平為低滾壓力水平；隨著滾壓力的增加，滾壓產(chǎn)生的表層應(yīng)力開(kāi)始接近深層材料的應(yīng)力，并引起深層材料應(yīng)力的較大改變，為過(guò)渡滾壓力水平；滾壓力進(jìn)一步增大，使?jié)L壓后工件材料應(yīng)力在表層形成最大應(yīng)力變化區(qū)，則為高滾壓力水平，其中過(guò)渡滾壓力水平對(duì)材料表層及深層綜合影響最大而又不會(huì)產(chǎn)生較大塑性變形。相同滾壓力下，薄壁滾壓應(yīng)力隨著薄壁厚度的增加，峰值與深層材料應(yīng)力的平均水平都有所降低，但是最大應(yīng)力峰值產(chǎn)生的深度基本保持不變。將滾壓應(yīng)力與初始應(yīng)力的疊加關(guān)系應(yīng)用NT型件的滾壓變形中，提出了基于校正圖譜進(jìn)行校J下的滾壓校正思路，并通過(guò)有限元仿真分析進(jìn)行了初步驗(yàn)證。采用解析方法和有限元法分析了平面二維應(yīng)力狀態(tài)毛坯初始?xì)堄鄳?yīng)力的矩形板工件在不同初始應(yīng)力條件下，逐層剝除過(guò)程中殘余應(yīng)力的重新分布規(guī)律以及引起的加工變形規(guī)律。分析表明，毛坯的初始應(yīng)力狀態(tài)對(duì)工件的變形形式具有決定性作用當(dāng)毛坯初始?xì)堄喾植紶顟B(tài)為表層為壓應(yīng)力、中間為拉應(yīng)力時(shí)，單面去除材料后，工件發(fā)生兩端向上翹曲的變形；當(dāng)毛坯初始?xì)堄喾植紶顟B(tài)為表層為拉應(yīng)力時(shí)，工件單面去除材料后，發(fā)生兩端向下彎曲的變形。以“日”字形兩隔框結(jié)構(gòu)件為例，構(gòu)建了側(cè)壁局部滾壓彎曲校正的有限元仿真分析模型，分析了滾壓過(guò)程中滾壓應(yīng)力與初始應(yīng)力的作用關(guān)系，以及不同滾壓參數(shù)下滾壓變形的變化規(guī)律?；谝陨戏治鰳?gòu)建了兩隔框結(jié)構(gòu)件滾壓變形校正圖譜，并進(jìn)行了仿真分析，表明該方法在隔框變形校正分析中有效，進(jìn)一步通過(guò)三隔框結(jié)構(gòu)件的彎曲變形校正仿真及實(shí)驗(yàn)對(duì)比進(jìn)行了驗(yàn)證，表明通過(guò)查詢(xún)校正圖譜確定隔框類(lèi)整體結(jié)構(gòu)件彎曲滾壓校正參數(shù)有效可行。對(duì)于實(shí)際應(yīng)用可能產(chǎn)生的誤差使校正結(jié)果一次無(wú)法滿(mǎn)足要求XII

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