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1.
A FORM INVARIANCE OF CONSTRAINED BIRKHOFFIAN SYSTEM   总被引:2,自引:0,他引:2  
IntroductionThestudyofthedynamicsofBirkhoffiansystemisanactivebranchinthemodernclassicalmathematicsandamoderndevelopingdirectioninmathematicphysics ,andcanbeappliedtoquantummechanics,statisticalmechanics ,biologicphysics,mechanicsofspaceflightandsomefie…  相似文献   

2.
IntroductionThereareoftensomestructuresorcomponentswhichcanonlytransferonespecialformofstress,suchasthecablewhichcanonlybeusedtotransferthetensionstressandthecontactcomponentwhichcanonlytransferthepressure.Ingeneral,suchproblemsareoftencalledtheunilat…  相似文献   

3.
COMPUTATION OF SUPERSONIC TURBULENT FLOWFIELD WITH TRANSVERSE INJECTION   总被引:1,自引:0,他引:1  
IntroductionThemixingflowfieldresultingfromasonicgaseousinjectioninjectedtransverselyintoasupersonicfreestreamisencounteredinmanyfieldssuchasrocketmotorthrustvectorcontrolsystems,supersoniccombustion ,high_speedflightvehiclereactioncontroljets,andgas_t…  相似文献   

4.
IntroductionThestaticsanddynamicsofrectangularplateshavealwaysbeenofparticularresearchinterestinsolidmechanics.Inparticular,theemergenceofnewmaterialsandnewstructureshasbroughtoutendlessvitalforceintothestudy .Itiswell_knownthattheclassicalplatetheoryb…  相似文献   

5.
IntroductionDuetotheirintrinsicelectromechanicalcouplingproperties,piezoelectricceramicshavebeenextensivelyusedindesignofvariouselectronicandelectromechanicaldevicessuchassensorsandactuators.Inrecentyears,mechanicalanalysisofdislocations ,cracks,cavitie…  相似文献   

6.
IntroductionFatiguefractrueisaprimarymodeoffailureformetallicstructuresandmechanicalsystemssubjectedtovariousdynamicloads.Atthebeginningofservice,someinherentdefectssuchasmicrocracks,weldingdefects,notches,voidsetc.existinmanystructuresorelements.Thesed…  相似文献   

7.
Stability and chaotic motion in columns of nonlinear viscoelastic material   总被引:3,自引:0,他引:3  
IntroductionTheproblemofthedynamicalstabilityofviscoelasticstructuresismorecomplicatedthanthatofelasticstructures,sincethestress_strainrelationofviscoelasticmaterialsoftenleadstoanintegro_differentialequationofmotion .Intheearlyresearchesonlinearvisco…  相似文献   

8.
IntroductionInrecentyears,withtremendousdevelopmentofparallelcomputers,theproblemofhowtoconstructeffectivedomaindecompositionparallelalgorithmsforlinearsystemarisingfromthefiniteelementdiscretizationhasbecomethefocusinthefieldofscientificcomputational…  相似文献   

9.
IntroductionAnelectrorheologicalfluid (ER)consistsofasuspensionofthedielectricparticlesinaliquidoflowdielectricconstantandlowviscosity .Itsapparentviscosityincreasesdramaticallyinthepresenceofanappliedelectricfield .Thephenomenonisreversible.Uponelectric…  相似文献   

10.
IntroductionInthispaper,wediscussnon_stationaryHamiltonianmechanics .Hamiltonianmechanicsisanimportantpartyofanalyticalmechanics[1].ThestationaryHamiltonianmechanicsisestablishedonthecotangentbundleoftheconfigurationspace—Riemannianmanifoldofmotionalsys…  相似文献   

11.
IntroductionDuetotheintrinsiccouplingcharacteristicsbetweenelectricandelasticbehaviors,thatis,appliedmechanicalloadingproduceselasticdeformation ,aswellaselectricfield ,andconverselyelectricfieldcangiverisetoelasticdeformation ,piezoelectricmaterialshave…  相似文献   

12.
IntroductionThestudyofsymmetryandconservedquantityofmechanicalsystemisanimportanttopicinmathematics,mechanicsandphysics .ThemoderntheoriesofsymmetryandconservedquantityofmechanicalsystemincludeNoethersymmetrytheoryandLiesymmetrytheory .In 1979M .Lutzkyando…  相似文献   

13.
Intherealmofchemoreception,thesenseofsmellremainsoneofthemostobscureprovinces.Morerecently,theartificialelectricnoseliesgoodprospectforvariableaspectssuchaspublicsecurity,nationaldefenceandforbiddennarcoticswiththedevelopmentoftissueengineeringandbio…  相似文献   

14.
ON THE ASYMPTOTIC BEHAVIOR OF HOPFIELD NEURAL NETWORK WITH PERIODIC INPUTS   总被引:3,自引:0,他引:3  
IntroductionSincethespecialsuperiorityofartificialneuralnetworkstechnologyinvariousengineeringtechniquesfields,suchasoptimization ,associativememories,patternrecognition ,signalprocessingandautomaticcontrol,therehasbeenincreasinginterestintheinvestigati…  相似文献   

15.
Dynamical Behavior of Viscoelastic Cylindrical Shells Under Axial Pressures   总被引:1,自引:1,他引:0  
IntroductionTheoryofviscoelasticityanditsapplicationshavebeenbecomingaveryattractiveresearchfieldsinceviscoelasticstructureswerewidelyappliedintovariousengineering .Buttotheauthors’knowledge,therearerareforpapersconcerningwithdynamicalbehaviorofviscoe…  相似文献   

16.
1 IntroductionandProblemThesolutionoftheRiccatiequationisoneofthekeystepsintheprocessofoptimalcontrol.Basedontheoriesofstructuralmechanicsandoptimalcontrol,preciseintegrationmethodwasdevelopedandcanbeusedtosolvetheRiccatiequationandalgebraicequationac…  相似文献   

17.
IntroductionWhilewestudythestrengthandthecrackofpractisingcomponents,thematerialdefectionshouldbeconsidered .IntheopinionsofCrackMechanics,thematerialdefectioncanbereducedtoplanarcracksandinclusions.Besides,theproblemofshort_fibercompositematerialsuchas…  相似文献   

18.
IntroductionMoreandmoreproblemsinscienceandengineeringhaveconcernedthestabilityanalysisoftheviscoelasticstructuresduetotheirbroadapplications .In [1]CederbaumandMondappliedthemultiple_scalesmethodtotreatstabilityofaviscoelasticcolumnunderaperiodicaxiall…  相似文献   

19.
IntroductionLotsoftimeseriesfrompracticalproblemsbelongtononlinearchaotictimeseries.Ithasbeenprovedinpracticethatthelinearmodelsofeitherlowordersorhighorderscannotbeusedtodescribenonlinearchaotictimeseries.Henceitisveryimportanttoinvestigatechaotictim…  相似文献   

20.
IntroductionTheinteractionofdislocationswithinclusionsisofconsiderableimportanceforunderstandingthephysicalbehaviorofmaterials.Suchstudiescanprovidedinformationconcerningcertainstrengtheningorhardeningmechanismsinnumberoftraditionalandcompositemateri…  相似文献   

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