One of the key challenges in room acoustics is accurately characterizing materials in situ—especially when traditional lab measurements aren’t feasible. This is particularly true for systems with perforated facings, which are commonly used but difficult to analyze outside controlled environments.
Our latest research tackles this issue. We present a novel method for in situ characterization of rigidly-backed porous materials behind rigid perforated facings using pressure–velocity measurements.
By applying an inverse impedance model in a limited frequency range, we’ve been able to successfully measure various perforated facings, both with air cavities and porous layers. We achieved a good match with reference values, with all retrieved parameters (like facing thickness, cavity depth, and porous layer resistivity) showing less than 15% error.
This approach offers a practical solution for acoustic consultants, enabling better design and assessment of real-world acoustic environments.
Our paper, with Baltazar Briere de La Hosseraye, PhD as first author, is openly accessible https://lnkd.in/eCActNz5
Building Acoustics TU/e 