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。

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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.

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

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：TheCommissionofScienceTechnologyandIndustryforNationalDefenseopenedinspectionmeetingonthenewregionalaircraft'stransferringfromdesignphasetocompletetrailphase.ThemeetingreleasedthedevelopmentofARJ21new

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简介：Onthebasisofspectrummomentdescriptionofasignal,evolutionaryvectorisdeveopedtodescribeslowlytime-varyingnoiseprocesses.Itdescribesthemaintime-varyingpropertiesofasignal.Applicationstoaircraftflying-overnoisearepresented.

简介：美国太空总署的超音速冲浪板、无人驾驶飞机X-43A于2004年11月下旬改写了历史，它9．6马赫(约每小时10500公里)的速度成为非正式的世界飞行记录。

简介：NorthwestAirlinesannouncedthatitwillacceleratetheretirementofitsremaining12DC10-30aircraftinservice.Theairlinesaidthatduringthenextsevenmonths,itwillreplaceDC10aircraftwithnewAirbusA330sandBoeing747-400