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1.
IntroductionOfallthefiber_reinforcedcompositematerials,theshort_fibercompositematerialnotonlystrengthensthematrixbutavoidsdefectionsofthelong_fibercompositematerialaswell.Themicro_mechanicsaboutitsuchasfracture ,fatigueanddamageisverycomplex .Intheprevi…  相似文献   

2.
IntroductionMostofthefiniteelementsareconstructedbyusingdisplacementfiniteelementmethod .Bysupposingthedisplacementfunctionsintheelement,andusingtheprincipleofminimumpotentialenergy,theelementstiffnessmatrixcanbeformulated .Ifthedisplacementfunctioninth…  相似文献   

3.
IntroductionSinceDienes(1979),NagtegalandDeJong(1982)etalhadocasionalyfoundthephenomenaofsimpleshearoscilationusingthegeneral...  相似文献   

4.
IntroductionFractalinterpolationmethodisnumericalmethodinthefractalgeometryusingiteratedfunctionsystem (IFS) ,itisdifferentfromtraditionalinterpolationmethod .M .F .Barnsely[1,2 ]firstgavethismethodandresearchedthecontinuityandthefractaldimensionofinterpolat…  相似文献   

5.
IntroductionIntheactivitiessuchastheaerospaceengineeringheatprotection[1,2 ],thelarge_scaleconcretepouring ,thechemicalproduction ,thepowdermetallurgyandthefiresafetyengineering[3,4],thereisonekindofnonlinearparabolicdistributedparametercontrolsystemwithmovi…  相似文献   

6.
IntroductionU_shapedbellowsareusuallyseeninthepipelinesystem (Fig .1) ,whichareusedtocompensatefortheaxialmovement,therotationandthedeflectionofthepipelinesduetothethermalaction ,thebaseunequalsettlementsandtheinstallationerrors.Theaxisymmetricaldeformatio…  相似文献   

7.
IntroductionSincethepioneeringworkonnonlinearstabilityofplanarincompressiblesteadyflowbyArnol’d ,agreatdealofattentionhasbeenpaidtononlinearstabilityoffluid (especiallygeophysicalfluid)motion ,andmuchprogresshasbeenmade.AsmentionedinRef.[1 ] ,intherealatmos…  相似文献   

8.
IntroductionConsiderthesystemofpartialdifferentialalgebraicequations (PDAEs) :Σ : Pi(y1,y2 ,… ,yn) =0   (i =1,2 ,… ,r) ,wherethecoefficientsareinthedifferentialfieldKwithcharacteristiczero .TheimportantquestionishowtosolvethisPDAEsinthetheoryofpartialdifferentialequa…  相似文献   

9.
IntroductionFermi,PastaandUlam[1]presentedawell_knownproblemwhysolidshadfiniteheatconductivity ,whichwascalledtheFermi_Pasta_Ulam(FPU)problem .Thesolidismodelledbyaone_dimensionallattice ,asetofmassescoupledbystring .Theequationsgoverningthedynamicsofthisla…  相似文献   

10.
ThefollowingLemmastated (in :AppliedMathematicsandMechanics (EnglishEdition) ,2 0 0 1 ,2 2 ( 1 1 ) :1 3 52 -1 3 56)wasappliedtodescribetheasymptoticbehaviorsofsolutionsofaclassofreaction_diffusionequation .Onaccountofthespecialpropertyofthesupersolution(i.e .,anonzerosolution…  相似文献   

11.
IntroductionManymechanicalsystemscanbeviewedaslinearHamiltoniansystems.Whenwestudytheeffectsofsystemparametersonthebehaviorofthesystems,thesystemcanberegardedasthesystemdependingonparameters.Veryimportantsystemparameters ,suchascriticalload ,criticalang…  相似文献   

12.
IntroductionAsageneralizationoftheclasicalfieldtheory,nonlocalfieldtheorycanbeusedasthetheoreticalbaseinmacro_micromechanicsb...  相似文献   

13.
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   

14.
IntroductionChaoticistheinherentrandomnessinthedefinitesystem .Thedefinitenessiscausedbythesysteminternalsbutnotbytheexternaldisturbance,whiletheinherentrandomnessistheirregularanddifficult_to_be_predictedbehaviorofthesystem .Whatismostattractiveofthec…  相似文献   

15.
IntroductionEversinceShepherdhassuggestedanovelmethodtostudynonlinearsaturationofbarotropicandbaroclinicinstability[1- 3],manyauthorshavemadefurtherresearchontheproblem .Shepherd’smethodisasfollows:First,chooseaclassofstablebasicflows;then ,decomposethedist…  相似文献   

16.
IntroductionForcomputationoftheviscouscompressibleflowstheNavier_Stokesequationsaregenerallyrepresentedintheconservationlawformasahyperbolicsystem .Lackingthemathematicaltooltoanalyzethisnonlinearsystem ,thenumericalmethodsusedinsolvingthenonlinearhype…  相似文献   

17.
IntroductionBeltramiflowisaspecialkindofflow .Itsvorticitydirectionisparalleltoitsvelocitydirectioneverywhere .Moreover,itsvelocityandvorticitysatisfythelinearHelmholtzequation .Infact,itisakindofrelativelysimpleflow .Buttherearemanycomplexphenomenahidden…  相似文献   

18.
IntroductionChaoticistheinherentrandomnessinthedefinitesystem .Thedefinitenessiscausedbythesysteminternalsbutnotbytheexternaldisturbance[1- 4],whiletheinherentrandomnessistheirregularanddifficult_to_be_predictedbehaviorofthesystem[5 ,6 ].Whatismostattractive…  相似文献   

19.
IntroductionInrecentyearsaremarkabledevelopmenthastakenplaceinthestudyofnonlinearevolutionarypartialdifferentialequations.Anexampleisthe“Good”Boussinesq (G .B .)equationutt =-uxxxx+uxx+ (u2 ) xx ( 1 )whichdescribesshallowwaterwavespropagatinginbothdirections.Thea…  相似文献   

20.
IntroductionBecauseoftherequirementofc1continuity ,itisverydifficulttoconstructconformingKirchhoffplatebendingelements.Inordertoovercomethedifficulty ,manyapproacheshavebeenpresented .Intheseapproaches,therequirementofc1isreleasedonconditionoftheconvergen…  相似文献   

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