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This paper presents an analytical-numerical study of the acoustic behavior of cavi- ties made up of rigid and flexible walls, with particular emphasis being laid on the acoustic problem of ducts. Topics in this paper include inertial effects due to sudden change of section in the singular zone. These results are compared with analytical expressions specially built for this, showing an excellent agreement between them.

UM ESTUDO ANALÍTICO-NUMÉRICO DAS ALTERAÇÕES DE FREQUÊNCIAS ESTRUTURA-CAVIDADE ACÚSTICA DEVIDO AOS EFEITOS DE UMA CONS-TRIÇÃO