简介:Weconsideramathematicalmodelwhichdescribesacontactbetweenadeformablebodyandafoundation.ThecontactisbilateralandmodelledwithTresca’sfrictionlaw.Thegoalofthispaperistostudyanoptimalcontrolproblemwhichconsistsofleadingthestresstensorascloseaspossibletoagiventarget,byactingwithacontrolontheboundaryofthebody.Westateanoptimalcontrolproblemwhichadmitsatleastonesolution.Wealsointroducetheregularizedcontrolproblemforwhichwestudytheconvergencewhentheregularizationparametertendstozero.Finally,anoptimallyconditionisestablishedforthisproblem.
简介:Thispaperisintendedtobeafirststeptowardsthecontinuousdependenceofdynamicalcontactproblemsontheinitialdataaswellastheuniquenessofasolution.Moreover,itprovidesthebasisforaproofoftheconvergenceofpopulartimeintegrationschemesastheNewmarkmethod.WestudyafrictionlessdynamicalcontactproblembetweenbothlinearlyelasticandviscoelasticbodieswhichisformulatedviatheSignorinicontactconditions.ForviscoelasticmaterialsfulfillingtheKelvin-Voigtconstitutivelaw,wefindacharacterizationoftheclassofproblemswhichsatisfyaperturbationresultinanon-trivialmixofnormsinfunctionspace.Thischaracterizationisgivenintheformofastabilityconditiononthecontactstressesatthecontactboundaries.Furthermore,wepresentperturbationresultsfortwowell-establishedapproximationsoftheclassicalSignorinicondition:TheSignoriniconditionformulatedinvelocitiesandthemodelofnormalcompliance,bothsatisfyingevenasharperversionofourstabilitycondition.
简介:ASUFFICIENTCONDITIONFORNON-COEXISTENCEOFONEDIMENSIONALMULTICOLORCONTACTPROCESSESLIUXIUFANG(刘秀芳)WANGJUN(王军)(DepartmentofMathem...
简介:Thispaperisconcernedwithasingularlimitfortheone-dimensionalcompressibleradiationhydrodynamicsmodel.ThesingularlimitweconsidercorrespondstothephysicalproblemoflettingtheBouguernumberinfinitewhilekeepingtheBoltzmannnumberconstant.InthecasewhenthecorrespondingEulersystemadmitsacontactdiscontinuitywave,WangandXie(2011)[12]recentlyverifiedthissingularlimitandprovedthatthesolutionofthecompressibleradiationhydrodynamicsmodelconvergestothestrongcontactdiscontinuitywaveintheL∞-normawayfromthediscontinuitylineatarateofε14,asthereciprocaloftheBouguernumbertendstozero.Inthispaper,WangandXie’sconvergencerateisimprovedtoε7/8byintroducinganewaprioriassumptionandsomerefinedenergyestimates.Moreover,itisshownthattheradiationfluxqtendstozerointheL∞-normawayfromthediscontinuityline,ataconvergencerateasthereciprocaloftheBouguernumbertendstozero.