Multi-layer Absorber Calculator

Absorption
Coefficient

Reflection
Coefficient

Impedance
(real)

Impedance
(imag)

Amend
Parameters

Global Parameters

Air temperature: 20°C
Air pressure: 101325 Pa

X Axis: Frequency
Range: 20Hz - 20000Hz
Scale: logarithmic
Resolution: medium

Angle of incidence: 0°
Porous model: Allard and Champoux (1992)
Helmholtz model: Ingard/Allard

Absorber Parameters

• Absorber 1
19mm Slotted Panel, 3mm/100mm (3.00%)
100mm Porous Absorbent, 5500 Pa.s/m2
200mm Air
100mm Porous Absorbent, 5500 Pa.s/m2
Rigid backing

• Absorber 2
19mm Slotted Panel, 6mm/100mm (6.00%)
100mm Porous Absorbent, 5500 Pa.s/m2
200mm Air
100mm Porous Absorbent, 5500 Pa.s/m2
Rigid backing

• Absorber 3
19mm Slotted Panel, 13mm/100mm (13.00%)
100mm Porous Absorbent, 5500 Pa.s/m2
200mm Air
100mm Porous Absorbent, 5500 Pa.s/m2
Rigid backing

• Absorber 4
19mm Slotted Panel, 1mm/100mm (1.00%)
100mm Porous Absorbent, 5500 Pa.s/m2
200mm Air
100mm Porous Absorbent, 5500 Pa.s/m2
Rigid backing

Absorber 1: Peak absorption at 81.9Hz. Damping=2.54 (high)

Absorber 2: Peak absorption at 104Hz. Damping=2.25 (high)

Absorber 3: Peak absorption at 132Hz. Damping=1.94 (high)

Absorber 4: Peak absorption at 53.1Hz. Damping=3.15 (high)

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