Validation of an eigenvalue-based inverse method for estimating locally-reacting surface impedance
Prinn AG, Panter P, Walther A, Habets E (2025)
Publication Type: Journal article
Publication year: 2025
Journal
Book Volume: 228
Article Number: 110332
DOI: 10.1016/j.apacoust.2024.110332
Abstract
Accurate boundary condition descriptions are essential for creating accurate computational models for room acoustics. These descriptions are often defined in terms of absorption coefficients or surface impedances. However, obtaining complex-valued, frequency-dependent values for an acoustically absorbing material sample at low frequencies is a challenging task. In fact, the current measurement standard ISO 354:2003 does not provide a method for measuring absorption coefficients below 100 Hz. In this paper, a recently proposed eigenvalue-based inverse method for estimating locally-reacting impedance at measurement system resonance frequencies is validated. The validation uses data from three samples measured in an impedance tube. The method is also used to estimate complex-valued, frequency-dependent impedances at frequencies below 100 Hz in a measured reverberant room and in a simulated reverberation chamber.
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Germany (DE)How to cite
APA:
Prinn, A.G., Panter, P., Walther, A., & Habets, E. (2025). Validation of an eigenvalue-based inverse method for estimating locally-reacting surface impedance. Applied Acoustics, 228. https://doi.org/10.1016/j.apacoust.2024.110332
MLA:
Prinn, Albert G., et al. "Validation of an eigenvalue-based inverse method for estimating locally-reacting surface impedance." Applied Acoustics 228 (2025).
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