Acoustic Modelling
Porous Absorber Calculator
Helmholtz Absorber Calculator
Multi-layer Absorber Calculator
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20 50 100 200 500 1000 2000 5000 10000 20000 Frequency (Hz) 0 0.2 0.4 0.6 0.8 1 Absorption Coefficient
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
10mm 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
10mm 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
10mm 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
10mm Air
100mm Porous Absorbent, 5500 Pa.s/m2
Rigid backing
Absorber 1: Peak absorption at 110Hz. Damping=2.52 (high)

Absorber 2: Peak absorption at 144Hz. Damping=2.20 (high)

Absorber 3: Peak absorption at 192Hz. Damping=1.85 (high)

Absorber 4: Peak absorption at 69.6Hz. Damping=3.23 (high)