Author(s)

P.-O. Mattel

Abstract

Vibration and sound radiation by baffled and constrained shells P.-O. Mattel Laboratoire de Mecanique et d'Acoustique, C.N.R.S. 31 Chemin Joseph Aiguier, 13042 Marseille cedex 20, France ABSTRACT A cylindrical thin elastic shell is embedded in a fluid extending up to infinity. The interior of the shell is a vacuum. Two different problems are considered : the constrained shell, which is free to vibrate within and outside a finite region but is clamped on the boundary between them ; and the baffled shell, which is free to vibrate within the finite region but is rigidly clamped outside this region. The displacement of the baffled shell can be approximated by that of the constrained shell, restricted to the domain limited by the constraints. The formulae for the acoustic far fields are proposed. Numerical examples show that, for a steel shell embedded in water, the exact and approximate solutions agree. I

Keywords