简介：ADAMS／Aircraft模块是我所创建飞机虚拟样机的软件之一，我们通过该软件建立一些起落架模型，进行了落震分析、动画模拟仿真，计算结果与其他工程软件计算结果吻合。

简介：应用MSC．ADAMS／Aircraft模块建立某飞机起落架模型，根据动力学原理，计算出缓冲器模型的空气弹簧力、油液阻尼力及结构限制力特性曲线。然后对模型进行考虑升力的落震试验分析，仿真试验结果表明利用MSC．ADAMS软件可以对起落架精确建模和仿真分析。

简介：“Libertycannotbepreservedwithoutageneralknowledgeamongthepeople。”

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简介：Inthemidseventiesanewpropulsorforaircraftwasdesignedandinvestigated-theso-calledPROPFAN.Withregardtothetotalpressureincrease,itrangesbetweenaconventionalpropellerandaturbofanwithveryhighbypassratio.Thisnewpropulsionsystempromisedareductioninfuelconsumptionof15to25%comparedtoenginesatthattime.Alotofpropfans(HamiltonStandard,USA)withdifferentnumbersofbladesandbladeshapeshavebeendesignedandtestedinwindtunnelsinordertofindanopimuminefficiency,Fig.1.ParalleltothisdevelopmentGE,USA,madeadesignofacounterrotatingunductedpropfan,theso-calledUDF,Fig.2.Aprototypeenginewasmanufacturedandinvestigatedonanin-flighttestbedmountedattheMD82andtheB727.Sincethattimetherehasnotbeenanyfurtherdevelopmentofpropfans(exceptAN70withNK90-engineUkraine,whichismoreorlessapropellerdesign)duetorelativelylowfuelpricesandtechnicalobstacles.Onlytechnicalprogramsindiferentcountriesarestillgoingoninordertoprepareadatabasefordesigningcounterrotatingfansintermsofaeroacoustics,aerodynamicsandaeroelasticities.InDLR.Germany,alotofexperimentalandnumericalworkhasbeenundertakentounderstandthephysicalbehaviouroftheunsteadyflowinacounterrotatingfan.

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简介：Toutilizingthecharacteristicofradarcrosssection(RCS)ofthelowdetectableaircraft,aspecialpathplanningalgorithmtoeludingradarsbythevariableRCSispresented.ThealgorithmfirstgivestheRCSchangingmodeloflowdetectableaircraft,thenestablishesathreatmodelofaground-basedairdefensesystemaccordingtotherelationsbetweenRCSandtheradarrangecoverage.Bythenewcostfunctionsoftheflightpath,whichconsiderbothfactorsofthesurvivalprobabilityandthedistanceoftotalroute,thispathplanningmethodissimulatedbasedontheDijkstraalgorithm,andtheplannedroutemeetstheflightcapacityconstraints.Simulationresultsshowthatusingtheeffectivepathplanningalgorithm,thelowdetectableaircraftcangivefullplaytoitsownadvantageofstealthtoachievethepurposeofsilentpenetration.

简介：Corrosionisoneoftheimportantstructuralintegrityconcernsofagingaircraft,anditisestimatedthatasignificantportionofairframemaintenancebudgetsisdirectedtowardscorrosion-relatedproblemsforbothmilitaryandcommercialaircraft.Inordertobetterunderstandhowenvironmentalfactorsinfluencethecorrosiondamageinitiationandpropagationonaircraftstructureandtopredictpre-corrosiontestpiecesoffatiguelifeandstructuralintegrityofaneffectiveapproach,thispaperuses...

简介：Accurateaerodynamicmeasurementsinthehypersonicflowoflargeaircraftmodelsintunnelshavepracticalsignificance,butposeasignificantchallenge.Novelaerodynamicforcemeasurementmethodshavebeenproposed,butlacktheoreticalsupport.Theformsoftheforcesignalstechniquesforsignalprocessingandcalculationofaerodynamicsareespeciallyproblematic.Atheoreticalstudyisconductedtoinvestigatethedynamicpropertiesbasedonmodelsofthedraw-rodsystemandslenderrods.Theresultsindicatethattheinertiaitemcanbeneglectedintherodgoverningequation;further,thesolutionsshowthatthesignalsofeachrodareacombinationofaerodynamicsignals(withaconstantvalue)andsinesignals,whichcanbeverifiedbyexperimentalshocktunnelresults.Signalprocessingandaerodynamicscalculationtechniquesarealsofoundtobeachievableviatheflatpartofthesignals.

简介：这篇论文证明那，为任何发电机xεExt是s，tq(Zp,Zp),如果(1L⋀我)*φ*(x)εExts+1，tq+2q(H*L⋀M，Zp)是在亚当斯的一个永久周期光谱顺序(驴)，然后h0xεExts+1，tq+q(Zp,Zp)也是在ASS的一个permenent周期。作为应用，纸获得那h0hnhm∈是在ASS和它的一个永久周期在范围的稳定的homotopy组收敛到顺序p的元素，在的地方p≥5是一个素数，s≤4，n≥m+2≥4并且M是穆尔光谱。

简介：JohnAdams是美国第二任总统，生活在美国独立战争、起草《独立宣言》和美国宪章等重大历史事件发生的时代。本书揭示了：历史是人创造的，伟人是历史长河中的星斗，照亮了人类前进的路程。

简介：Duetothedefectsofcurrentaircraftproductconfigurationtechnology,suchasthegapbetweenproductdesignandcustomers’requirements,thelowconfigurationefficiencyandetc.acustomer-orientedproductconfigurationsolutionofaircraftwasproposedinthispaper.Basingonadeepinvestigationintothemarketandthestructureoftheaircraft,thispaperproposedamethodofdividingandcreatingtheaircraftoptions,inwhichwesetupoptionalconstraintstomeetthedemandofconfigurationandthenoptimizedtheconstraintalgorithm.Thisworkcanhelptorealizetheoptimumassociationbetweentheaircraftoptionsandmodules.Basingonaresearchoncustomerdemand,Thepaperestablishedacustomerdemandmodelandamappingrelationshipwhichexistsbetweencustomerdemandandaircraftoptions,Itcanalsohelptomakeagreatcontributiontobuildcustomerpersonalizeddemandoftheaircraftconfigurationprocessandtheaircraftconfigurationlibrary.

简介：Athree-dimensionalglobalchemistrytransportmodel(OSLOCTM2)isusedtoinvestigatetheimpactofsubsonicaircraftNOxemissiononNOzandozoneoverChinaintermsofayear2000scenarioofsubsonicaircraftNOxemission.TheresultsshowthatsubsonicaircraftNOxemissionsignificantlyaffectsnorthernChina,whichmakesNOxat250hPaincreasebyabout50pptvwiththehighestpercentageof60%inJanuary,andleadingtoanozoneincreaseof8ppbvwith5%relativechangeinApril.TheNOxincreaseismainlyattributedtothetransportprocess,butozoneincreaseisproducedbythechemicalprocess.TheNOxincreasesbylessthan10pptvbyvirtueofsubsonicaircraftNOxemissionoverChina,andozonechangeslessthan0.4ppbv.WhensubsonicaircraftNOxemissionoverChinaisdoubled,itsinfluenceisstillrelativelysmall.

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简介：Inordertoassurequalityandcontrolprocessinthedevelopmentoftheaircraftcollaborativedesignsoftware,amaturityassessmentmodelisproposed.Therequirementsdesigning—houseofqualityisdesignedtoevaluatethematuritydegreeofthesolution,andtheevaluationresultscanhelptomanageandcontrolthedevelopmentprocess.Furthermore,afuzzyevaluationmethodbasedontheminimumdeviationisproposedtodealwiththefuzzyinformation.Thequantitativeevaluationresultofthematuritydegreecanbecalculatedbyoptimizingthesemanticdiscountfactoraimfortheminimumdeviation.Finally,thismodelisillustratedandanalyzedbyanexamplestudyoftheaircraftcollaborativedesignsoftware.

简介：Amethodologyisimplementedtofindtheoptimumreducedweightconfigurationdesignofanoperatingstructureofacivilaircraftverticaltailfin.FE(finiteelement)basedtopologyoptimizationisexecutedtofindtheoptimummaterialdistributionofinitialdesignspaceofribbymaximizingthestiffness.Loadspertinenttotheoperatingandgroundconditionsareestimatedandapplied,consideringtheorientationofstructuralassemblymembersandbuilt-insupportsofferedinthemainstructure.Manufacturingconstraintsareincorporatedintotheoptimizationlooptogeneratepragmaticandmanufacturabledesignconfiguration.ThetopologicallyoptimizedconfigurationisthenconvertedtoCADviabledesignthroughdatareductionandsmoothingbyconvertingtoISO-surfaces.Amethodologyisalsodevisedtomodifythetopologicaloptimizedvoidsandmateriallayoutpreciselywithsplinesandfilletstoconstructmanufacturablefeaturesandavoidstressconcentrations.Theresultingnoveldesignproposalisthenanalyzedandvalidatedagainststipulatedloads,constraintsandotherdesignneeds.Resultsvalidatethenewdesignproposalasmorereliable,havingreducedweightandenhancedstructuralperformance.

简介：WiththevigorousdevelopmentofequipmentmanufacturingindustryinChina,higherrequirementstotheequipmentsupportabilityareputforward.Howtoevaluatethesupportabilityofequipments(especiallytheaviationequipment-aircraft)objectivelyandcorrectlyistheproblemtobesolvedinthedevelopmentofaviationequipmentsconstruction,demonstrationandbattleapplication.Aimedattheneedsofthesupportabilityanalysisofcomplexequipmentsystems-aircraft,amodelofaircraftsupportconceptevaluationbasedonDEA(dataenvelopmentanalysis)andPCA(principalcomponentanalysis)isproposed.Themodelisusedtoevaluateacertainaircraftsupportconcept.Theprocessandtheresultsofevaluationshowthatproposedmodelisfeasibleandeffective.Themodelissuitableforadvancedaircraftsupportconceptevaluation.Thefeasibilityandeffectivenessoftheproposedmodelisverifiedbytheanalysisoftheevaluationresults.Thismethodisapplicabletotheevaluationofaircraftsupportconcepts.

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简介：在3-2-1fixturing计划在细工品位置和取向上瞄准大飞机运输钻模，部件错误的效果和细工品表面的错误的汇编精确性与对象姿势空格描述方法被学习。印射在前面框架行李架和它的支持底的连接部分之间的模型的错误用同类的转变矩阵(HTM)被建模方法。概率的错误用蒙特卡罗方法被模仿。测量实验被激光追踪者进行验证途径的有效性，并且途径成功地被用于运输钻模的生产。

简介：在到单眼用的图象序列的特性的暗示，一个方法基于过滤预言图象序列的飞机姿势的扩大Kalman被建议。与过滤技术的伪鈥?尾鈥?纬马厩状态，一个数学模型被造认识到图象序列的飞机姿势的预言。在模型，不是仅仅噪音的影响，在图象期间，进程被考虑，而且在经常的速度模型的低精确的缺点被克服。加速的推导被认为噪音同样白。预兆的曲线与Matlab阴谋证明使用这个方法的错误的最大值是大约3鈥吗？它的精确因此更高，错误标准差是比经常的速度模型的那些低的。CLC数字TP751由科学的中国学院的革新条款支持了(资助没有。C04708Z）