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: 15Hz - 20000Hz
Scale: logarithmic
Resolution: medium

Angle of incidence: 0°
Porous model: Allard and Champoux (1992)
Helmholtz model: Ingard/Allard
Absorber Parameters
Absorber 1
16mm Slotted Panel, 3mm/500mm (0.60%)
314mm Porous Absorbent, 5000 Pa.s/m2
Rigid backing
Absorber 2
16mm Slotted Panel, 3mm/135mm (2.22%)
314mm Porous Absorbent, 5000 Pa.s/m2
Rigid backing
Absorber 3
16mm Slotted Panel, 3mm/65mm (4.62%)
314mm Porous Absorbent, 5000 Pa.s/m2
Rigid backing
Absorber 4
16mm Slotted Panel, 3mm/40mm (7.50%)
314mm Porous Absorbent, 5000 Pa.s/m2
Rigid backing
Absorber 1: Peak absorption at 42.4Hz. Damping=8.26 (very high)

Absorber 2: Peak absorption at 83.2Hz. Damping=3.21 (high)

Absorber 3: Peak absorption at 125Hz. Damping=2.18 (high)

Absorber 4: Peak absorption at 167Hz. Damping=1.81 (high)