The acoustic impedance condition (with the default value ρc) should be used at the outer boundary when Absorbing Layers are used in a model.
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Wave-Based Time-Domain Room Acoustics with Frequency-Dependent Impedance. Application Library path Acoustics_Module/Building_and_Room_Acoustics/wave_based_room
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For the User defined option enter all the necessary parameters that are present in the rational approximation (rational expansion), that is, the Frequency-independent (asymptotic) admittance (SI unit: m2·s/kg), enter the Real residues and poles (R and ξ) into the table, and enter the Complex residues and poles (Q and ζ) into the table (note that the conjugate terms are automatically added). The quantities can also be loaded from a file (remember to include the number column). Select if the rational approximation function is scaled for frequency data or angular frequency data by selecting the Equation scaled for frequency data option (selected per default).
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For the From function option select the Reference which is a Partial Fraction Fit function defined in the model, then click the Import icon () to copy the fitted data to the admittance field, and the residues and poles tables. To go to the function source click the Go to Source icon ().
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