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Communication Dans Un Congrès Année : 2022

VIBROACOUSTIC SIMILITUDE LAWS FOR FLUID-LOADED PLATES EXCITED BY POINT FORCES

Résumé

Vibroacoustic experiments on large complex structures radiating sound in a heavy fluid (such as naval structures) can be costly, time-consuming and difficult to implement. There is a need for methods that overcome these constraints. Similitude theory provides a methodology which links two systems in order to predict the response of one to the other by scaling all of their parameters (e.g. materials, size, loading conditions). Previous studies demonstrated the potential of similitude methods to predict the vibration and sound radiation of plates in a light fluid from measurements on a scaled-down system. The challenge here is to determine similitude laws for bending plates excited by a point force and loaded by a heavy fluid. This paper derives the vibroacoustic similitude laws for such a situation. By taking into account the wall pressure acting on the plate, new similitude conditions need to be respected in order to obtain perfect similitude for both the vibration and acoustic response. These conditions are used to adequately choose the scaled system. Then, two examples are considered and numerical results illustrate the similitude laws previously developed. The first example highlights the impact of fluid-structure coupling on the choice of the scaled system. The second example validates the laws taking into account this coupling and the corresponding similitude conditions. These examples show that structural response and radiated acoustic power of a reference plate can be recovered by using the related scaling laws.
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Dates et versions

hal-03797274 , version 1 (04-10-2022)

Identifiants

  • HAL Id : hal-03797274 , version 1

Citer

Xavier Plouseau-Guédé, Alain Berry, Laurent Maxit, Valentin Meyer. VIBROACOUSTIC SIMILITUDE LAWS FOR FLUID-LOADED PLATES EXCITED BY POINT FORCES. International Congress on Sound and Vibration, Jul 2022, Singapour, Singapore. ⟨hal-03797274⟩
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