简介:ThispaperisconcernedwithanoptimalcontrolproblemofanablationtranspirationcoolingcontrolsystemwithStefan-Signoriniboundarycondition.Theexistenceofweaksolutionofthesystemisconsidered.TheDubovitskiiandMilyutinapproachisadoptedintheinvestigationofthePontryagin'smaximumprincipleofthesystem.Theoptimalitynecessaryconditionispresentedfortheproblemwithfixedfinalhorizonandphaseconstraints.