Acoustic Absorber Properties dialog box

Modeling Object
Name	Specifies the name of the acoustic absorber properties.
Label	Specifies a unique numerical identifier for the modeling object.
Properties
Impedance	Specifies how the impedance is defined.
Surface Coefficients	Specifies how the surface coefficients are defined.
Fully Absorbent Material	Excludes rays that are absorbed by panels during the geometrical computation.
Impedance options
The following options appear when you set Property Type to Impedance.
Impedance	Sets the type of impedance. You can select Real/Imaginary, Magnitude/Phase, or Field.
Real	Appears when Impedance is set to Real/Imaginary.Sets the real component value of the impedance.
Imaginary	Appears when Impedance is set to Real/Imaginary.Sets the imaginary component value of the impedance.
Magnitude	Appears when Impedance is set to Magnitude/Phase.Sets the magnitude value of the impedance.
Phase	Appears when Impedance is set to Magnitude/Phase.Sets the phase angle value of the impedance.
Specify Field	Appears when Impedance is set to Field.Specifies the frequency-dependent complex field values.Options include:Select Existing Field from List opens the Fields dialog box, where you can select a field.A field can define a magnitude that varies with independent variables such as frequency, temperature, or time. For more information about fields, see Fields.Formula Constructor opens the Formula Field dialog box, where you can define a formula to construct a field.For more information, see Define a boundary condition using a formula field.Table Constructor opens the Table Field dialog box, where you can define tabular data to construct a field.For more information, see Define a boundary condition using a table field and Define a material property using a table field.Plot (XY) plots the field as an XY graph.For more information, see Graph overview.Overlay (XY) overlays a plot on an existing plot. You can overlay up to 50 plots.For more information, see Overlay plots.
Surface Coefficients options
The following options appear when you set Property Type to Surface Coefficients.
Absorption	Lets you specify the alpha coefficient.
Alpha Coefficient	Appears when the Absorption check box is selected.Specifies a constant value, or when you click , lets you specify frequency-dependent values with a table or formula field. The software uses the Alpha Coefficient (\alpha ) to calculate incoming energy absorption (\alpha x incoming energy).Note: The value must be equal or greater than 0.For more information, see Additional magnitude options.
Diffusion	Lets you specify the diffusion coefficient.
Delta Coefficient	Appears when the Diffusion check box is selected.Specifies a constant value, or when you click , lets you specify frequency-dependent values with a table or formula field. The software uses the Delta Coefficient (\delta ) to calculate diffuse reflection of incoming energy absorption ((1 - \alpha ) x \delta x incoming energy).Note: The value must be equal or greater than 0.For more information, see Additional magnitude options.
Transmission	Lets you specify the transmission coefficient.
Tau Coefficient	Appears when the Transmission check box is selected.Specifies a constant value, or when you click , lets you specify frequency-dependent values with a table or formula field. The software uses the Tau Coefficient (\tau ) to calculate:Diffuse transmitted energy. \tau must be smaller than or equal \alpha , because \alpha is a measure of both dissipated and transmitted energy of a panel.Diffuse absorbed energy. The software calculates the total absorbed energy from \alpha x incoming energy. From this, the panel transmits the fraction \tau , and dissipates the fraction (\alpha, - ,\tau ).Note: \tau must be greater than 0, and equal or less than 1.For information about combination of surface coefficients, see Simcenter 3D Ray Acoustics environment.For more information on magnitude options, see Additional magnitude options.

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Acoustic Absorber Properties dialog box, Simcenter 3D 2021.1 Series

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