Acoustic Treatment Boundary Calculator

Application ID: 118611


This app allows to calculate the absorption coefficient and surface impedance of a sound absorbers for normal and random incidences. The computed quantities can be used when setting up boundary conditions in a Pressure Acoustics, Frequency Domain model or a Ray Acoustics model.

The configuration of the absorber is flexible. The sample under study can be chosen to be a porous or solid material, and it can be backed with an air cavity, a porous cavity, or rigid condition. The thickness and depth of the different elements can also be adjusted as needed.

The app contains a conversion of the results from frequency to time domain with the Partial Fraction Fit function. This makes it possible to use the calculated surface impedance as boundary condition in time domain simulations. The surface admittance calculated for the fitting can be saved and later imported in a separate model to describe the impedance of a boundary.

This application example illustrates applications of this type that would nominally be built using the following products: