BRIDGING THE FREQUENCY GAP FOR VIBRO-ACOUSTIC PREDICTION OF A SUBMERGED SHELL

Valentin Meyer (1) , Christian Audoly (1) , Daipei Liu (2) , Nicole Kessissoglou (2) , Laurent Maxit (3)

1 Naval Group Research [Bouguenais]
2 School of Mechanical and Manufacturing Engineering [Sydney]
3 LVA - Laboratoire Vibrations Acoustique

Modelling the vibro-acoustic behaviour of an underwater vehicle is important to predict the impact on the marine environment, to ensure that the noise and vibration levels do not pose discomfort for crew, and to assist in identifying mitigation strategies to reduce underwater radiated noise. The motivation of this paper is to examine the vibro-acoustic responses of a simplified physical model of an underwater vehicle corresponding to a finite cylindrical shell submerged in a heavy fluid of infinite extent, representing a classic fluid-structure interaction problem. The cylindrical shell is excited by a point force in the radial direction. The structural and acoustic responses of the submerged hull in the low to medium frequencies are predicted using a range of techniques to cover and bridge the frequency ranges. The advantages and limitations of each technique are discussed.

Domaines: Acoustique [physics.class-ph]

Valentin Meyer, Christian Audoly, Daipei Liu, Nicole Kessissoglou, Laurent Maxit. BRIDGING THE FREQUENCY GAP FOR VIBRO-ACOUSTIC PREDICTION OF A SUBMERGED SHELL. Wespac 13th Western Pacific Conference on Acoustics, Nov 2018, New delhi, India. ⟨hal-01922797v2⟩