Performance-based optimisation method for radiated sound power in a coupled system

摘要

This article presents a procedure for optimising the placement of poroelastic material onto a flexible plate coupled to an air cavity, with the aim of reducing the noise radiated by the plate inside the cavity. A numerical method is presented to compute the solution of this problem when a monopole harmonic excitation is applied on the bottom of the fluid. This coupled problem is solved numerically with a finite element method based on Lagrange hexahedral elements in the fluid and four node Mixed Interpolated Tensorial Component elements in the plate. The behaviour of the absorbing material on the plate is simulated by means of wall impedance. The procedure put forward is based on a calculation of the element's sound radiation rate, searching for optimum configurations in a given frequency range. Finally, a few numeric examples are given.