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 120mm lanaroca d=28 80mm lanaroca d=28 80mm aire 80mm lanaroca d=40 80mm aire 120mm lanaroca d=40
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 (120mm lanaroca d=28)
120mm Porous Absorbent, 8500 Pa.s/m2
Rigid backing
Absorber 2 (80mm lanaroca d=28 80mm aire)
80mm Porous Absorbent, 8500 Pa.s/m2
80mm Air
Rigid backing
Absorber 3 (80mm lanaroca d=40 80mm aire)
80mm Porous Absorbent, 14000 Pa.s/m2
80mm Air
Rigid backing
Absorber 4 (120mm lanaroca d=40)
120mm Porous Absorbent, 14000 Pa.s/m2
Rigid backing