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

2.
IntroductionC_shapedbellowsorreferredtoassemi_circlebellowsarewithcomplexconfiguration(Fig .1) .Attheconcaveandconvexjointsoftheshell,forexampleatpointC ,thelatitudeangleψincreasesby 180°abruptly .Soitisthekeytocalculationforbellowsthatmakingupsolutionsexact…  相似文献   

3.
Therearemanydocumentsthatdiscussblow_upofthesolutionsfortheinitial_boundaryvlueproblemsofthenonlinearSchr dingerequations,suchaspaper [1 ] .Butthepaper [1 ]hasoneweakpoint,thatis,itcannotunitediscussionforblow_upofthesolutionsfortheinitial_boundaryvalueprobl…  相似文献   

4.
General solution for u-shaped bellows overall-bending problems   总被引:1,自引:0,他引:1  
IntroductionU_shapedbellows,anelasticelement,showninFig .1 ,isusedinmanywaysandingeneralsubjecttopressure ,axialforce ,lateralforcesandmoments.Inresearch ,itisusuallysimplifiedintoringshellsandringplates.TheaxisymmetricalproblemsofU_shapedbellowshavebeendee…  相似文献   

5.
IntroductionOfallthefiber_reinforcedcompositematerials,theshort_fibercompositematerialnotonlystrengthensthematrixbutavoidsdefectionsofthelong_fibercompositematerialaswell.Themicro_mechanicsaboutitsuchasfracture ,fatigueanddamageisverycomplex .Intheprevi…  相似文献   

6.
IntroductionItiswell_knownthatpiezoelectricmaterialsproduceanelectricfieldwhendeformedandundergodeformationwhensubjectedtoanelectricfield .Thecouplingnatureofpiezoelectricmaterialshasattractedwideapplicationsinelectric_mechanicalandelectricdevices,suc…  相似文献   

7.
IntroductionBellows,ashellofwrinkledmeridianofrevolution ,hasbeingincreasinglyusedinmodernequipmentasanelastic_sensitiveelementandaflexiblejoint.Theformerisusuallysubjectedtolargedisplacementsatitsends,andthelattermaypartlyenterintoplasticstate .Hence ,b…  相似文献   

8.
IntroductionIntheactivitiessuchastheaerospaceengineeringheatprotection[1,2 ],thelarge_scaleconcretepouring ,thechemicalproduction ,thepowdermetallurgyandthefiresafetyengineering[3,4],thereisonekindofnonlinearparabolicdistributedparametercontrolsystemwithmovi…  相似文献   

9.
IntroductionTheelastichalf_spacetheoryoffoundationvibrationandthestudyofsoil_structureinteractionproblemhavebeenthesubjectofintensiveresearchinthecivilengineering .SinceLucoetal.[1]summarizedthevibrationofacircularrigidfoundationrestingonanelastichalf_s…  相似文献   

10.
IntroductionItiswell_knownthatpseudo_parabolicequationwithprincipalpartut -uxxthasbeenstudyingrecently ,becausethereexistswidephysicalbackgroundforthisclassofequations.[1 ]studiedthemulti_dimensioninverseproblemforthefollowingclassofnonlinearevolutionequ…  相似文献   

11.
IntroductionChaoticistheinherentrandomnessinthedefinitesystem .Thedefinitenessiscausedbythesysteminternalsbutnotbytheexternaldisturbance,whiletheinherentrandomnessistheirregularanddifficult_to_be_predictedbehaviorofthesystem .Whatismostattractiveofthec…  相似文献   

12.
IntroductionThecylindricalparticlesuspensionsinvolvesomedifficultproblemsinthetheoreticalresearchofmultiphaseflowandnon_Newtonianflow ,andhavewideapplicationintheindustrialengineering .Forexample,duringtheprocessingofsomematerials,primitivematerialprope…  相似文献   

13.
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   

14.
IntroductionChaoticistheinherentrandomnessinthedefinitesystem .Thedefinitenessiscausedbythesysteminternalsbutnotbytheexternaldisturbance[1- 4],whiletheinherentrandomnessistheirregularanddifficult_to_be_predictedbehaviorofthesystem[5 ,6 ].Whatismostattractive…  相似文献   

15.
IntroductionWhenamovingbody (forexample:ship)isinmotionontheocean ,aV_shapedshipwaveappearsbehindthebody .Inthisarticle,wewilldiscusstheshapeofthevelocityfieldandtheV_shapedshipwave .Atfirst,Ref.[1]studiedthequestionsofshipwavesonanincompressibleinviscidflui…  相似文献   

16.
IntroductionInthiswork,westudytheproblemsoftheboundednesanduniformboundednesofsolutionsofnon_autonomousdiferentialequationsof...  相似文献   

17.
CATASTROPHE FRACTURE OF THIN-WALL PRESSURE TUBES   总被引:1,自引:0,他引:1  
IntroductionThecylindricaltubeisoneofthemostimportantelementsofstructuresusedinengineering .Thin_wallcylindricaltubes,drivenradialoutwardbyhighexplosivedetonationpressure ,commonlyexpandtotwicetheiroriginaldiameterspriortofractureandsuddenlybreakup .And…  相似文献   

18.
1 TheFlowModelofPower_LawFluidinRadicalFractalReservoirThetransientflowofpower_lawfluidinradicalfractalreservoirisstudiedinRef.[1 ] ,andanalyticalsolutionofLaplacespaceisderived .InRef.[2 ] ,thetransientellipticalflowisresearchedonmodelofexpandingrectangle .T…  相似文献   

19.
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   

20.
IntroductionForcomputationoftheviscouscompressibleflowstheNavier_Stokesequationsaregenerallyrepresentedintheconservationlawformasahyperbolicsystem .Lackingthemathematicaltooltoanalyzethisnonlinearsystem ,thenumericalmethodsusedinsolvingthenonlinearhype…  相似文献   

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