[Calzone153]

Hello everybody,

I am attempting to study the effects of air-cavity diameter on the acoustic absorption of an alberich coating using harmonic acoustics. Instead of modelling the water closure side I have applied an acoustic impedance boundary condition on the front face of the silicon layer (the anechoic layer). This layer is affixed to a steel backplate. A port has been applied to the exterior face of the silicon layer and a port in duct used to apply a load. I have subsequently calculated the absorption coefficient for the model in a 0-3500 Hz range but am getting nowhere near the desired result and wondered if anyone might be able to help me?

Thank you.