Acoustic Modelling
Porous Absorber Calculator
Helmholtz Absorber Calculator
Multi-layer Absorber Calculator
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10 20 50 100 200 500 1000 2000 5000 10000 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: 10Hz - 10000Hz
Scale: logarithmic
Resolution: medium

Angle of incidence: 0°
Porous model: Allard and Champoux (1992)
Helmholtz model: Ingard/Allard
Absorber Parameters
Absorber 1
100mm Porous Absorbent, 17324 Pa.s/m2
400mm Air
Rigid backing
Absorber 2
200mm Porous Absorbent, 17324 Pa.s/m2
300mm Air
Rigid backing
Absorber 3
200mm Porous Absorbent, 5000 Pa.s/m2
300mm Air
Rigid backing
Absorber 4
300mm Porous Absorbent, 5000 Pa.s/m2
200mm Air
Rigid backing