Acoustic absorbtion material optimisation in the mid-high frequency range

Sébastien Besset (1) , Mohamed Ichchou (1)

1 LTDS - Laboratoire de Tribologie et Dynamique des Systèmes

Acoustic modelling, applicable to poroelastic materials in a wide frequency range, is time consuming. This paper offers an energy method for optimising absorption coefficients at the boundaries of an acoustic cavity. The influence of absorption coefficients on this proposed energy method will be examined first. The next step will seek to optimise the location of absorbing materials. Numerical results will prove the method's effectiveness. Improvements in the overall optimisation process will also be proposed. A model based on polynomial interpolations will be developed in order to further reduce time consumption.

Mots clés: Absorption coefficient; Mid-frequency range; Energy methods; BEM; Injected power density; Energy density; Intensity

Domaines: Mécanique des structures [physics.class-ph]; Mécanique des structures [physics.class-ph]; Vibrations [physics.class-ph]; Vibrations [physics.class-ph]; Acoustique [physics.class-ph]; Acoustique [physics.class-ph]

Sébastien Besset, Mohamed Ichchou. Acoustic absorbtion material optimisation in the mid-high frequency range. Applied Acoustics, 2011, 72 (9), pp.632-638. ⟨10.1016/j.apacoust.2011.01.014⟩. ⟨hal-00625139⟩