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 OC703, 95 solid Isover Lamda 37, 95mm Solid Isover Lamda 37, 95mm 55 air Isover Lamda 37, 70 mm 80 mm a
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: high

Angle of incidence: 0°
Porous model: Komatsu (2008)
Helmholtz model: Ingard/Allard
Absorber Parameters
Absorber 1 (OC703, 95 solid)
95mm Porous Absorbent, 23600 Pa.s/m2
Rigid backing
Absorber 2 (Isover Lamda 37, 95mm Solid)
95mm Porous Absorbent, 10000 Pa.s/m2
Rigid backing
Absorber 3 (Isover Lamda 37, 95mm 55 air)
95mm Porous Absorbent, 10000 Pa.s/m2
55mm Air
Rigid backing
Absorber 4 (Isover Lamda 37, 70 mm 80 mm a)
70mm Porous Absorbent, 10000 Pa.s/m2
80mm Air
Rigid backing
Dotted lines indicate that the model used to estimate absorber properties has been used outside of its applicable range. Results may therefore be less accurate than where a solid line is displayed.