Determination of efficiency of anechoic or decoupling hull coatings using water tank acoustic measurements

Christian Audoly (1)

1 DCNS

External anechoic and decoupling hull coatings are used on ships or submarines to reduce acoustic target strength and radiated noise, respectively. Measurement of test panels in a water tank gives only the reflection and transmission coefficients in free field, with respects to frequency. It is shown using simple models that anechoic and decoupling efficiencies can be derived, providing appropriate modulus and phase measurement of the coefficients. Additionnally, the influence of a non-rigid elastic backing can be simulated without additional measurement. That information is of particular interest for the naval architects and specialists involved in design. In this paper, the theoretical formulation of the problem will be presented, then applied to simulated test cases. Some experimental results on test Panels will also be shown.

Mots clés: Acoustic coatings; Radiated noise control; Anechoism; Underwater acoustics

Domaines: Acoustique [physics.class-ph]

Christian Audoly. Determination of efficiency of anechoic or decoupling hull coatings using water tank acoustic measurements. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810798⟩