How the Model Works
The Delany-Bazley-Miki model predicts a porous material's characteristic impedance and complex wavenumber from a single measured property: flow resistivity. From those, a transmission-line transform through the layer (optionally over an air gap) to the rigid wall behind it gives the surface impedance, and from that, the absorption coefficient at any frequency.
- Flow resistivity (σ): higher values mean denser, stiffer material — light fiberglass and rigid mineral wool sit at very different points on the same absorption curve.
- Thickness: thicker absorbers push the useful absorption band lower in frequency.
- Air gap: spacing the absorber off the wall extends low-frequency performance without adding material.
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