Porous Absorber Calculator
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Global Parameters
Air temperature
°C
Air pressure
Pa
Number of absorbers to be modelled
1
2
3
4
Results format
Graph
Detailed Analysis
X Axis
Frequency
Angle of incidence
Layer 1 thickness
Layer 1 resistivity
Layer 2 thickness
Layer 2 resistivity
Layer 3 thickness
Layer 3 resistivity
Layer 4 thickness
Layer 4 resistivity
X range
-
Hz
X scale
Logarithmic
Linear
Resolution
High
Medium
Low
Frequency
Hz
Random incidence
Angle of incidence (degrees)
Model
Delany and Bazley (1970)
Mechel/Grundmann GF (1982)
Mechel/Grundmann MF (1982)
Miki (1990)
Allard and Champoux (1992)
Komatsu (2008)
Parameter Options
Angle of incidence
Global
Absorber
Analysis frequency
Global
Absorber
Model
Global
Absorber
Absorber 1
(
blue
)
Legend
Layer 1
Not used
Air
Porous Absorbent
Thickness (mm)
Flow resistivity (Pa.s/m
2
)
Layer 2
Not used
Air
Porous Absorbent
Thickness (mm)
Flow resistivity (Pa.s/m
2
)
Layer 3
Not used
Air
Porous Absorbent
Thickness (mm)
Flow resistivity (Pa.s/m
2
)
Layer 4
Not used
Air
Porous Absorbent
Thickness (mm)
Flow resistivity (Pa.s/m
2
)
Closest to rigid backing
Random incidence
Angle of incidence (degrees)
Analysis Frequency (Hz)
Model
Delany and Bazley (1970)
Mechel/Grundmann GF (1982)
Mechel/Grundmann MF (1982)
Miki (1990)
Allard and Champoux (1992)
Komatsu (2008)
Absorber 2
(
green
)
Legend
Layer 1
Not used
Air
Porous Absorbent
Thickness (mm)
Flow resistivity (Pa.s/m
2
)
Layer 2
Not used
Air
Porous Absorbent
Thickness (mm)
Flow resistivity (Pa.s/m
2
)
Layer 3
Not used
Air
Porous Absorbent
Thickness (mm)
Flow resistivity (Pa.s/m
2
)
Layer 4
Not used
Air
Porous Absorbent
Thickness (mm)
Flow resistivity (Pa.s/m
2
)
Closest to rigid backing
Random incidence
Angle of incidence (degrees)
Analysis Frequency (Hz)
Model
Delany and Bazley (1970)
Mechel/Grundmann GF (1982)
Mechel/Grundmann MF (1982)
Miki (1990)
Allard and Champoux (1992)
Komatsu (2008)
Absorber 3
(
red
)
Legend
Layer 1
Not used
Air
Porous Absorbent
Thickness (mm)
Flow resistivity (Pa.s/m
2
)
Layer 2
Not used
Air
Porous Absorbent
Thickness (mm)
Flow resistivity (Pa.s/m
2
)
Layer 3
Not used
Air
Porous Absorbent
Thickness (mm)
Flow resistivity (Pa.s/m
2
)
Layer 4
Not used
Air
Porous Absorbent
Thickness (mm)
Flow resistivity (Pa.s/m
2
)
Closest to rigid backing
Random incidence
Angle of incidence (degrees)
Analysis Frequency (Hz)
Model
Delany and Bazley (1970)
Mechel/Grundmann GF (1982)
Mechel/Grundmann MF (1982)
Miki (1990)
Allard and Champoux (1992)
Komatsu (2008)
Absorber 4
(
orange
)
Legend
Layer 1
Not used
Air
Porous Absorbent
Thickness (mm)
Flow resistivity (Pa.s/m
2
)
Layer 2
Not used
Air
Porous Absorbent
Thickness (mm)
Flow resistivity (Pa.s/m
2
)
Layer 3
Not used
Air
Porous Absorbent
Thickness (mm)
Flow resistivity (Pa.s/m
2
)
Layer 4
Not used
Air
Porous Absorbent
Thickness (mm)
Flow resistivity (Pa.s/m
2
)
Closest to rigid backing
Random incidence
Angle of incidence (degrees)
Analysis Frequency (Hz)
Model
Delany and Bazley (1970)
Mechel/Grundmann GF (1982)
Mechel/Grundmann MF (1982)
Miki (1990)
Allard and Champoux (1992)
Komatsu (2008)