Acoustic Modelling
Porous Absorber Calculator
Helmholtz Absorber Calculator
Multi-layer Absorber Calculator
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10 20 50 100 200 Frequency (Hz) 0 0.2 0.4 0.6 0.8 1 Absorption Coefficient mdf10, 12cm aire, 20cm LaRoc D40 mdf10, 1cm aire, 32cm LaRoc D40 mdf10, 4cm aire, 28cm LaRoc D40 mdf10, 7cm aire, 24cm LaRoc D40
Absorption
Coefficient
Reflection
Coefficient
Impedance
(real)
Impedance
(imag)
Amend
Parameters
Global Parameters
Air temperature: 20°C
Air pressure: 101325 Pa

X Axis: Frequency
Range: 10Hz - 200Hz
Scale: logarithmic
Resolution: medium

Angle of incidence: 0°
Porous model: Allard and Champoux (1992)
Helmholtz model: Ingard/Allard
Absorber Parameters
Absorber 1 (mdf10, 12cm aire, 20cm LaRoc D40)
Limp Membrane, 8.35 Kg/m2
120mm Air
200mm Porous Absorbent, 14000 Pa.s/m2
Rigid backing
Absorber 2 (mdf10, 1cm aire, 32cm LaRoc D40)
Limp Membrane, 8.35 Kg/m2
10mm Air
320mm Porous Absorbent, 14000 Pa.s/m2
Rigid backing
Absorber 3 (mdf10, 4cm aire, 28cm LaRoc D40)
Limp Membrane, 8.35 Kg/m2
40mm Air
280mm Porous Absorbent, 14000 Pa.s/m2
Rigid backing
Absorber 4 (mdf10, 7cm aire, 24cm LaRoc D40)
Limp Membrane, 8.35 Kg/m2
70mm Air
240mm Porous Absorbent, 14000 Pa.s/m2
Rigid backing
Absorber 1: Peak absorption at 33.4Hz. Damping=1.12 (medium)

Absorber 2: Peak absorption at 33.2Hz. Damping=3.33 (high)

Absorber 3: Peak absorption at 33.5Hz. Damping=2.53 (high)

Absorber 4: Peak absorption at 33.8Hz. Damping=1.83 (high)