简介：Fromtheviewpointsofenvironmentalprotection,supportfortheagedandensuringtherighttomobility,thereisaneedtodevelopanewtypeofmobilityvehiclethatprovidesmoreeffectivetransportation.Theauthorsproposeaninvertedpendulumvehiclewithpedalsasoneoftheformsofpersonalmobilityvehicles(PMVs).Inthispaper,thesteeringperformanceoftheinvertedpendulumvehiclewithpedalsisdiscussedbasedonexperimentsonaprototype.Fromtheexperimentalresults,itwasconfirmedthattheerrorsfromthefivesubjectsforthetargettrajectoryandthefive-gradeevaluationofthemaneuverabilityweresimilar.Finally,wecreatedaninvertedpendulumvehiclewithpedalstowhichwasaddedareactionactuatorforthesteeringsystem.Fromtheexperimentalresults,itwasfoundthatsettingappropriatefeedbackgainsforthehandlesteeringangleanditsrateofrotation,whichcontroltherightandleftwheeldrivingtorques,resultedingreatlyimprovedmaneuverability.

简介：Thispaperdescribesacomputationalstudyofthehydrodynamicsofaray-inspiredunderwatervehicleconductedconcurrentlywithexperimentalmeasurements.High-resolutionstereo-videosofthevehicle’sfinmotionsduringsteadyswimmingareobtainedandusedasafoundationfordevelopingahighfidelitygeometricalmodeloftheoscillatoryfin.ACartesiangridbasedimmersedboundarysolverisusedtoexaminetheflowfieldsproducedduetothesecomplexartificialpectoralfinkinematics.SimulationsarecarriedoutatasmallerReynoldsnumberinordertoexaminethehydrodynamicperformanceandunderstandtheresultantwaketopology.Resultsshowthatthevehicle’sfinsexperiencelargespanwiseinflexionofthedistalpartaswellasmoderatechordwisepitchingduringtheoscillatorymotion.Mostthrustforceisgeneratedbythedistalpartofthefin,anditishighlycorrelatedwiththespanwiseinflexion.Twosetsofinter-connectedvortexringsareobservedinthewakerightbehindeachfin.Thosevortexringsinducestrongbackwardflowjetswhicharemainlyresponsibleforthefinthrustgeneration.

简介：这份报纸开发acoupled动力学模型因为线性正式就职马达(秘鲁利玛机场之代号)车辆和一条地铁追踪在系统的动态行为上调查车辆的多角形的车轮的影响。在模型，车辆与自由的35度作为一个多身体系统被建模。一根Timoshenko横梁被用来为被睡眠者分离地支持的栏杆建模。睡眠者作为僵硬身体被建模与他们的垂直，侧面，并且滚动运动正在被考虑。以便模仿沿着课程跑的车辆，一个动人的睡眠者支持模型被介绍由分离睡眠者支持者，睡眠者在被假定以与火车速度一样的经常的速度向后移动模仿刺激。赫兹波接触理论和Shen-Hedrick-Elkins模型被利用分别地处理在车轮和栏杆之间的正常动态力量和正切的力量。以便更好描绘线性metro系统(LMS)，Euler横梁理论基于形式的重叠，方法被用来为秘鲁利玛机场之代号和RP建模。在LIM和RP之间的垂直电的磁性的力量和侧面的恢复力量也被考虑。前者有变化差距的非线性的特征，虽然后者被看作恢复1kN的力量的一个常数。数字分析在系统的动态行为上由于多角形的车轮考虑刺激的效果在不同穿阶段，在哪个使用的数据关于多角形上穿车轮踩直接在地铁地点被测量。

简介：Environmentalpollutionanddecliningresourcesoffossilfuelsinrecentyears,haveincreaseddemandforbetterfueleconomyandlesspollutionforgroundtransportation.Amongthealternativesolutionsprovidedbyresearchersinrecentdecades,hybridelectricvehiclesconsistedofaninternalcombustionengineandanelectricmotorhavebeenconsideredasapromisingsolutionintheshort-term.Inthepresentstudy,fueleconomycharacteristicsofaparallelhybridelectricvehicleareinvestigatedbyusing...

简介：Inthepresentresearchtwodifferentwholevehiclemultibodymodelsareestablishedrespectively,includingrigidandrigid-flexiblecouplingmultibodyvehiclemodels.Theformerisallcomposedbyrigidbodieswhileinthelatermodel,theflexiblerearsuspensionisbuiltbasedonthefiniteelementmethod(FEM)andmodesuperpositionmethod,inwhichthedeformationsofthecomponentsareconsidered.Theridesimulationswithdifferentspeedsarecarriedoutona3Ddigitalizedroad,andtheweightedrootmeansquare(RMS)ofaccelerationsontheseatsurface,backrestandatthefeetarecalculated.Thecomparisonbetweentheresponsesoftherigidandrigid-flexiblecouplingmultibodymodelsshowsthattheflexibilityofthevehiclepartssignificantlyaffectstheaccelerationsateachposition,anditisnecessarytotaketheflexibilityeffectsintoaccountfortheassessmentofridecomfort.更多还原

简介：Alargeeddysimulation(LES)oftheflowsaroundanunderwatervehiclemodelatintermediateReynoldsnumbersisperformed.TheunderwatervehiclemodelistakenastheDARPASUBOFFwithfullappendages,wheretheReynoldsnumberbasedonthehulllengthis1.0×105.Animmersedboundarymethodbasedonthemoving-least-squaresreconstructionisusedtohandlethecomplexgeometricboundaries.Theadaptivemeshrefinementisutilizedtoresolvetheflowsnearthehull.Theparallelscalabilitiesoftheflowsolveraretestedonmesheswiththenumberofcellsvaryingfrom50millionto3.2billion.Theparallelsolverreachesnearlylinearscalabilityfortheflowsaroundtheunderwatervehiclemodel.Thepresentsimulationcapturestheessentialfeaturesofthevortexstructuresnearthehullandinthewake.Bothofthetime-averagedpressurecoefficientsandstreamwisevelocityprofilesobtainedfromtheLESareconsistentwiththecharacteristicsoftheflowspassanappendedaxisymmetricbody.Thecodeefficiencyanditscorrectpredictionsonflowfeaturesallowustoperformthefull-scalesimulationsontensofthousandsofcoreswithbillionsofgridpointsforhigher-Reynolds-numberflowsaroundtheunderwatervehicles.

简介：Thesubsystemsynthesismethodhasbeendevelopedinordertoimprovecomputationalefficiencyforamultibodyvehicledynamicsmodel.Usingthesubsystemsynthesismethod,equationsofmotionofthebasebodyandeachsubsystemcanbesolvedseparately.Inthesubsystemsynthesismethod,variouscoordinatesystemscanbeusedandvariousintegrationmethodscanbeappliedineachsubsystem,aslongastheeffectivemassmatrixandtheeffectiveforcevectorareproperlyproduced.Inthispaper,comparativestudyhasbeencarriedoutforthesubsystemsynthesismethodwithCartesiancoordinatesandwithjointrelativecoordinates.Twodifferentintegrationmethodssuchasanexplicitintegratorandanexplicitimplicitintegratorareemployed.Inordertoseetheaccuracyandcomputationalefficiencyfromthedifferentmodelsbasedonthedifferentcoordinatesystemsanddifferentintegrationmethods,aroughterrainrunsimulationshasbeencarriedoutwitha6×6off-roadmultibodyvehiclemodel.

简介：ThebimodalTaylorexpansionmethodofmoments(B-TEMOM)modelschemewasdevelopedtosimulatetheformationandevolutionofvehicleexhaustparticles.Twoindependenttypesoflog-normalparticlesizedistributionswereselectedintheB-TEMOMmodelscheme,comprisinglargeandsmallparticlestorepresentbackground(i.e.,thesurroundingenvironment)andvehicleexhaustparticles,respectively.Concentrationdistributionsofexhaustandbackgroundparticlesderivedusingthismodelschemewereverifiedagainstresultsfromamovingsectionalmethodandthebimodalquadraturemethodofmoments,showingexcellentagreement.Theeffectsofvehicletailpipeex让cond让ions(e.g.,exhaustparticleconcentrationsandvelocity),sulfurcontent,andrelativehumidityontheevolutionofparticleswereinvestigatednumerically.Bothtwo-dimensionalandthree-dimensionalnumericalsimulationsshowedthattailpipeexitvelocityandrelativehumid让ydidnotgreatlyaffectthesteady-stateconcentrationsorthediametersofparticlesinurbanatmospheres.Althoughanincreaseinsulfurcontenthadlittleeffectontheparticleconcentration,itledtobackgroundparticleswithlargergeometricaveragediameterenteringtheenvironment.ThiscoupledCFD-B-TEMOMnumericalmodelprovidesasimplebutaccurateandefficientmethodforstudyingbimodalaerosoldynamics.

简介：Tosystematicallystudythevehicle–bridgecoupleddynamicresponseanditschangerulewithdifferentparameters,avehiclemodelwithsevendegreesoffreedomwasbuiltandthetotalpotentialenergyofvehiclespacevibrationsystemwasdeduced.Consideringthestimulationofroadroughness,thedynamicresponseequationofvehicle–bridgecoupledsystemwasestablishedinaccordancewiththeelasticsystemprincipleoftotalpotentialenergywithstationaryvalueandthe‘‘set-in-right-position''rule.Onthebasisoftheself-compiledFortranprogramandbridgeengineering,thedynamicresponseoflongspancontinuousgirderbridgeundervehicleloadwasstudied.Thisstudyalsoincludedthecalculationofvehicleimpactcoefficient,evaluationofvibrationcomfort,andanalysisofdynamicresponseparameters.Resultsshowtheimpactcoefficientchangeswithlanenumberandislargerthanthevaluecalculatedbythe‘‘generalcodefordesignofhighwaybridgesandculverts(China)''.TheDieckmannindexofbridgevibrationisalsorelatedtolanenumber,andthevibrationcomfortevaluationisgoodinnormalconditions.Therelevantconclusionsfromparametricanalyseshavepracticalsignificancetodynamicdesignanddailyoperationoflong-spancontinuousgirderbridgesinexpressways.Safetyandcomfortareexpectedtoimprovesignificantlywithfurthercontrolofthevibrationofvehicle–bridgesystem.