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 nuevo arreglo techo techo original
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: random
Porous model: Allard and Champoux (1992)
Helmholtz model: Ingard/Allard
Absorber Parameters
Absorber 1 (nuevo arreglo techo)
80mm Porous Absorbent, 18600 Pa.s/m2
200mm Air
40mm Porous Absorbent, 21400 Pa.s/m2
400mm Air
Rigid backing
Absorber 2 (techo original)
40mm Porous Absorbent, 21400 Pa.s/m2
400mm Air
Rigid backing
Impedance plots are not available for random incidence.