2019_programme: UNDERWATER ACOUSTIC RADIATION FROM PARTIALLY IMMERSED CYLINDRICAL SHELLS

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  • Session: 06. Underwater Noise - Modelling and Measurements
    Organiser(s): Gavrilov Alexander, Skarsoulis Emmanuel, Taroudakis Michael
  • Lecture: UNDERWATER ACOUSTIC RADIATION FROM PARTIALLY IMMERSED CYLINDRICAL SHELLS
    Paper ID: 1042
    Author(s): Diab Daher, Leon Fernand, Chati Farid, Marcellin Simon, Decultot Dominique
    Presenter: Diab Daher
    Presentation type: oral
    Abstract: The purpose of this work is to study the underwater acoustic radiation from a set of partially immersed cylindrical shells in water. First, the vibratory behavior of a stainless steel tube subject to an axial excitation on its emerged section is studied, numerically and experimentally; in the frequency range 20 kHz - 150 kHz. The identification of waves propagating along this tube is realized from a 2D finite element model developed using COMSOL Multiphysics code. The identified waves are the antisymmetric Lamb wave (A0), the symmetric Lamb wave (S0) and the Scholte Stoneley wave (A). A good agreement between numerical and experimental results is observed. \nThe second part of this paper deals with the sound pressure radiated in water by partially immersed tubes. Two geometric configurations are studied: one tube or two tubes subject to axial excitation on the emerged tube section. In each case, a 3D finite element model is developed and implemented using COMSOL Multiphysics code. These ones enable us to determine the acoustic pressure (resonance spectra) radiated in water from each configuration in an azimuthal plane. In order to validate the numerical model, measurements have been realized in a large tank filled with water for the two distinct geometric configurations. The considered frequency band is between 10 kHz and 120 kHz. The resonance spectra show a good agreement between the numerical and experimental results. \n
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  • Corresponding author: Dr Diab Daher
    Affiliation: Laboratoire Ondes et Milieux Complexes, UMR 6294 CNRS
    Country: France
    e-mail:

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