Airflow Resistance and Acoustic Flow Resistivity
topic
Airflow resistance measurement passes a defined airflow volume rate through a fabric specimen and measures the differential pressure across it, calculating specific airflow resistance in Pascal-seconds per metre and normalised flow resistivity in Pascal-seconds per metre squared; these parameters directly determine sound absorption performance through the viscous dissipation mechanism.
Role
Provides the primary acoustic design parameter for porous textile absorbers, enabling prediction of absorption coefficient spectra from flow resistivity using Delany-Bazley acoustic models and optimisation of fibre diameter, fabric density, and thickness for target absorption performance.
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