Modelling of acoustic absorbers

Predict material properties, surface impedance and absorption coefficients of acoustic absorbers
Updated 27 Nov 2018

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Various empirical models are implemented for getting the characteristic impedance and wavenumber of porous materials such as glass fibre and mineral wool:
1. Delany and Bazley
2. Mechel and Ggrundmann
3. Wilson, simplified relaxation model
These porous absorber models are then used to calculate the surface impedance and absorption coefficient of different absorbents using a transfer matrix approach.
1. effect_of_perforated_sheet_open_area.m Shows how the open area changes the surface impedance and absorption coefficient of some Helmholtz absorbers using a transfer matrix approach.
2. microperforated_absorber.m Calculates the absorption coefficient for a single layer microperforated absorber.
3. slotted_absorber.m calculates absorption coefficient for a Helmholtz absorber that uses slots (slits) rather than round holes.
The formulations for the models are outlined in Acoustic Absorbers and Diffusers by Trevor Cox and Peter D'Antonio

Cite As

Trevor Cox (2024). Modelling of acoustic absorbers (, MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2015b
Compatible with any release
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Version Published Release Notes

Typographical corrected in effect_of_perforated_sheet_open_area.m which made a very small difference to calculated results

Tidied up descriptions