简介：一个有效、灵活的旋转和赔偿计划被设计改进旋转惯性的航行系统(RINS)的精确性。单人赛轴的RINS的精确性被错误在旋转的轴上限制。有为纤维的旋转的轴的错误赔偿的一个新奇惯性的测量单位(IMU)计划眼的旋转罗盘(雾)RINS被介绍。在计划，有类似的错误特征的二对惯性的传感器在旋转斧子上相对地被装补偿传感器错误。没有为旋转周期的任何变化，这个计划改进系统精确和可靠性，并且也为系统提供冗余性。36h航行模拟的结果证明系统的精确性尤其是与正常strapdownINS相比被改进，除出发精确性以外与单人赛轴的RINS相比到3次被增加，并且位置精确性被1个数量级改进。

简介：wellposedness问题为一各向异性不可压缩粘滞在3的液体，在向量B附近旋转(t，x):=(b1(t，x)，b2(t，x)，b3(t，x))，被学习。在同类的案例中的全球wellposedness(B=e3)与在空间B0的足够地快的旋转，？被证明。在不同类的案例中(B=B(t，xh))，在B0的答案的全球存在和唯一，？被获得，如果起始的数据是足够的与水平粘性相比小。而且，我们在一样的函数空格获得解决方案的一致本地存在和唯一。我们也在B2,1获得整齐的繁殖吗？在另外的假设下面，那B仅仅取决于一个水平空间变量。

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：Thisworkinvestigatestheflowofathirdgradefluidinarotatingframeofreference.Thefluidisincompressibleandmagnetohydrodynamic(MHD).Theflowisboundedbetweentwoporousplates,thelowerofwhichisshrinkinglinearly.Mathematicalmodellingoftheconsideredflowleadstoanonlinearproblem.Thesolutionofthisnonlinearproblemiscomputedbythehomotopyanalysismethod(HAM).Graphsarepresentedtodemonstratetheeffectofseveralemergingparameters,whichclearlydescribetheflowcharacteristics.

简介：象在旋转液体的范围和磁盘一样的身体的相互作用导致新奇流动结构。在环绕的方向的主要打漩流动被一个第二等的运动在南方的飞机附加。流动被在轴的中心通过一个洞介绍墨水设想并且在在交往的身体之间的中央飞机放射状地散布了。流动结构取决于身体，他们的几何安排和旋转速度给的雷纳兹数字的形状。观察流动结构与PIV测量和数字模拟产生了进一步的调查。关键词旋转液体-模式形成-再通行地区-交往的身体-流动可视化CLC数字O351.3

简介：Thispapergivesanexactanalysisofarotatingpiezoelectricsphericalshellwitharbitrarythickness.Atfirst,threedisplacementfunctionsareintroducedtosimplifythebasicequationsofasphericallyisotropic,piezoelectricmedium.Byexpandingthedisplacementfunctionsaswellastheelectricpotentialintermsofsphericalharmonics,thebasicequationsofequilibriumareconvertedtoanuncoupledEulertype,secondorderordinarydifferentialequationandacoupledsystemofthreesecondorderordinarydifferentialequations.Ageneralsolutiontothehomogeneousequationsofequilibriumisthenderived.Thestaticanalysisofarotatingsphericalshellisthenperformedandnumericalexampleispresented.

简介：高度有效的汽轮机用尽更弥漫没有与汽轮机的最后旋转的排考虑不稳定的相互作用，不能被设计。在文学描述的以前的调查为改善与涡轮机器的另外的部分的相比显示出一个很高的潜力更弥漫。一台典型煤气的汽轮机的一个规模模型用尽更弥漫试验性地被调查。为了调查旋转的影响，醒来，没有象有有2公里的一个可变速度的旋转圆柱的轮辐车轮的大小一样的一个说的车轮的大小--或模仿汽轮机转子的10公里轮辐醒来被做。象2D-Laser-Doppler-Velocimeter(LDV)一样的使小型化的3洞灵魂探针被用来调查速度侧面。122静态的压力拍被用来测量几轴、环绕的静态的压力分布。没有一个轮辐车轮环形更弥漫在笼罩分开因为所有打漩配置。为有2公里轮辐车轮的大小，分开更弥漫当使测试钻塔操作参数不变时，是不稳定的。为一非旋转10公里轮辐车轮并且以旋转速度不到1,000rpm，环形更弥漫在笼罩分开了。增加10mm轮辐车轮的旋转速度，流动不比没有轮辐，车轮完成在笼罩和高得多的压力恢复分开了。

简介：ThispaperreportsonanexperimentalandnumericalstudyatlowReynoldsnumberinordertoevaluatetheinfluenceoftheCoriolisforcesontheflowinradialrotatingchannels.Operatingconditionscorrespondtotheflowinradialimpellersformicrogasturbineapplications.AcomparisonofdetailedflowmeasurementswithCFDresultsindicatesthatNavierStokessolverswithstandardk-ωandSSTturbulencemodelspredicttheflowsurprisinglywellandthatnoextracorrectionsforCoriolisforcesarerequiredattheseoperatingconditions

简介：纸在操作条件的部分流动指光线的流动泵更弥漫的翼更少的行为。一些试验性的数据用2D/2CPIV和在内的不稳定的压力大小被获得了更弥漫，处于各种各样的操作条件。以更低的流动率的试验性的结果与二维的数字计算相比。

简介：PrecipitationofBaSO4nanoparticleswasstudiedforthefirsttimeinaspeciallydesignedrotatingpackedbed(RPB),whichallowedsamplingatdifferentradialpositionstoprovidebetterinsightofthemechanismofprecipitationinRPB.ParticlesizeandmorphologywerecharacterizedbyTEM,whilethequalityofsynthesizedBaSO4powderswasanalyzedbyXRDandBET,andcomparedwiththosepreparedinastirred-tankreactor.TheimportantroleoftheinletregionoftheRPBinthewholeprecipitationprocesswasexperimentallyconfirmed,asasignificantessenceforthedesignofindustrialRPBfortheprecipitationofsparinglysolublematerials.Theeffectsofdifferentoperatingconditionsonparticlesizewerealsoinvestigated,showingthatparticlesizedecreaseswithincreasingrotationalspeedandliquidflowrate,duetotheenhancementofmicromixingintheRPB.

简介：Thetheoryofflowsimilarityhasnotbeenwellestablishedforgranularflows,incontrasttothecaseforconventionalfluids,owingtoalackofreliableandgeneralconstitutivelawsfortheircontinuumdescription.Arigorousinvestigationofthesimilarityofvelocityfieldsindifferentgranularsystemswouldbevaluabletotheoreticalstudies.However,experimentalmeasurementsfacetechnologicalandphysicalproblems.Numericalsimulationsthatemploythediscreteelementmethod(DEM)maybeanalternativetoexperimentsbyprovidingsimilarresults,wherequantitativeanalysiscouldbeimplementedwithvirtuallynolimitation.Inthisstudy,thesimilarityofvelocityfieldsisinvestigatedfortherollingregimeofrotatingdrumsbyconductingsimulationsbasedontheDEMandusinggraphicsprocessingunits.ForaconstantFroudenumber,itisfoundthattheparticle-to-drumsizeratioplaysadominantroleinthedeterminationofthevelocityfield,whilethevelocityfieldismuchmoresensitivetosomematerialpropertiesthantoothers.Theimplicationsofthesefindingsarediscussedintermsofestablishingtheoreticalsimilaritylawsforgranularflows.

简介：FlowfieldsaroundarotatingcircularcylinderinauniformstreamarecomputedusingalowdimensionalGalerkinmethod.ResultsshowthattheformationofaFopplevortexpairbehindastationarycircularcylinderiscausedbythestructuralinstabilityinthevicinityofthesaddlelocatedattherearofthecylinder.Forrotatingcylinderabifurcationdiagramwiththeconsiderationoftwoparameters,ReynoldsnumberReandrotationparameterα,isbuiltbyakinematicanalysisofthesteadyflowfields.

简介：Inthispaper,weinvestigatetheRayleigh-Taylorinstabilityproblemfortwocompressible,immiscible,inviscidflowsrotatingwithaconstantangularvelocity,andevolvingwithafreeinterfaceinthepresenceofauniformgravitationalfield.FirstweconstructtheRayleigh-Taylorsteady-statesolutionswithadenserfluidlyingabovethefreeinterfacewiththesecondfluid,thenweturntoananalysisoftheequationsobtainedfromlinearizationaroundsuchasteadystate.Inthepresenceofuniformrotation,thereisnonaturalvariationalframeworkforconstructinggrowingmodesolutionstothelinearizedproblem.Usingthegeneralmethodofstudyingafamilyofmodifiedvariationalproblemsintroducedin[1],weconstructnormalmodesolutionsthatgrowexponentiallyintimewithratelikeet■whereξisthespatialfrequencyofthenormalmodeandtheconstantcdependsonsomephysicalparametersofthetwolayerfluids.AFouriersynthesisofthesenormalmodesolutionsallowsustoconstructsolutionsthatgrowarbitrarilyquicklyintheSobolevspaceH~k,andleadstoanill-posednessresultforthelinearizedproblem.Moreover,fromtheanalysisweseethatrotationdiminishesthegrowthofinstability.Usingthepathologicalsolutions,wethendemonstratetheill-posednessfortheoriginalnon-linearprobleminsomesense.

简介：飞机引擎片/盒子抑制分析上的试验性、数字的调查被介绍。片外面抑制能力分析是在新飞机引擎设计的必要的步，但是抑制测试是费时间的并且招致重要费用；因此，开发一个短时期、便宜的数字方法被保证。用明确的非线性的动态有限元素分析软件，现在的学习数字地为在测试设备的高速度的纺纱上被执行的模仿的片抑制测试调查了高速度的影响过程。很多模拟与不同网孔尺寸和接触惩罚因素和磨擦系数的不同价值用有限元素模型被进行。在试验性、数字的结果之间的详细比较表明网孔尺寸和磨擦系数在生产的结果上有可观的影响。一个更好的网孔将预言案例的更低的抑制能力，这被显示出，它接近测试数据。磨擦系数的更大的价值也预言更低的抑制能力。然而，如果避免假穿入足够大，接触惩罚因素在模拟结果上有小效果。

简介：LetG=(V(G),E(G))beasimpleconnectedgraphofordern.Foranyverticesu,v,w∈V(G)withuv∈E(G)anduw∈E(G),anedge-rotatingofGmeansrotatingtheedgeuv(aroundu)tothenon-edgepositionuw.Inthiswork,weconsiderhowtheleasteigenvalueofagraphperturbswhenthegraphisperformedbyrotatinganedgefromtheshorterhangingpathtothelongerone.

简介：

简介：Aerodynamicperformanceofthehigh-altitudepropeller,especiallythecounterrotationeffects,isexperimentallystudied.Influencesofdifferentconfigurationsonastratosphericairship,included2-bladecounter-rotatingpropeller(CRP),dual2-bladesinglerotationpropellers(SRPs)and4-bladeSRP,arealsoindicated.Thisresearchindicatesthattheeffectofcounterrotationcangreatlyimprovetheefficiency.ItshowsthattheCRPconfigurationresultsinahigherefficiencythanthedual2-bladeSRPsconfigurationor4-bladeSRPconfigurationunderthesameadvanceratio,andtheCRPconfigurationalsogainsthehighestefficiencywhetherunderthesituationofprovidingthesametrustorabsorbingthesamepower.Itconcludesthat,forastratosphericairship,theCRPconfigurationisbetterthanthemultipleSRPsconfigurationoramulti-bladeSRPone.

简介：TransitiontoTaylorvortexflowbetweentwoconicalcylinders,withtheinneronerotatingandtheouteronestationary,isstudiedbythenumericalmethodinthisarticle.ItisfoundthatthebasicflowbecomesunstablewithincreasingofReynoldsnumber(Re)aboveacertaincriticalvalueRec=117andwiththefurtherincreaseofRetoaboutRe=300,thefirststablevortexisformednearthetopoftheflowsystem.TheannulusisfilledwithsixpairsofvorticesataboutRe=800.Theseareconfirmedbyexperimentalobservations.Moreover,thelocalextremevaluesofpressureandvelocityarereachedattheadjacentlinesbetweenneighboringvorticesoratthemediumlinesoflargevortices.Thelocalminimumvaluesofvelocityandthelocalmaximumvaluesofpressurearereachedatthesamepoint,whereasthelocalmaximumvaluesofvelocityoftheflowareassumedatthepointofinflectionforpressure.

简介：Anumericalstudywasconductedforthefullydevelopedlaminarflowinrotatingcurvedellipticalpipe.Duetotherotation,theCoriolisforcecanalsocontributetothesecondaryflow.Theinteractionofrotationandcurvaturecomplicatestheflowcharacteristics.Theboundary-fittedcoordinatewasadoptedtostudytheflowcharacteristicintherotatingsystems.Theeffectsofrotationontheflowtransitionwerestudiedindetail.Thegenerationandmergenceofvorticesinrotatingcurvedellipticalpipeswerealsocapturedforthefirsttime.Thesimulationresultsshowthattheflowforthecaseoflargeaspectratioofthecross-sectionismorelikelytobeunstablethanthatforsmallerone.

简介：这份报纸与vaned在一台离心的压缩机向旋转货摊从正常操作条件在这个过程上汇报数字研究更弥漫。目的更好在在离心的impeller和vaned之间的相互作用下面在货摊点附近理解流动特征更弥漫。数字结果证明在就先于货摊点的某些条件下面，尖端漏旋涡开始波动在粗略地过去的片的一半频率。这现象类似于在轴的压缩机的旋转不稳定性。与流动，率进一步减少了impeller货摊并且五个货摊房间在旋转速度被发现的85%impeller的频率宣传。