Fill the form below to compute the sound absorption coefficient for a porous material sample bounded onto a rigid and impervious wall using Delany-Bazley-Miki model.
h denotes the thickness of the porous material sample, σ the static air flow resistivity of this material.

The figure presents the sound absorption coefficients (plane waves at normal incidence and diffuse sound field) of

• a mm-thick porous material backed by a rigid and impermeable wall with
• a static air-flow resistivity of N.s.m-4.

Click/Touch and drag the underlined blue text to change the values and compute a new result.


Sound abs. coefficient vs. frequency:

■: plane waves at normal incidence, ■: diffuse field.