Prinn A (2025)
Publication Type: Conference contribution
Publication year: 2025
Publisher: Acoustical Society of America
Book Volume: 60
Conference Proceedings Title: Proceedings of Meetings on Acoustics
Event location: Honolulu, HI, USA
DOI: 10.1121/2.0002263
To accurately predict sound fields in rooms using computational models, reliable quantitative data of the sound absorption characteristics of the materials in the room must be available. Obtaining this data can be challenging. Perhaps the most commonly used approach is to rely on tables of random incidence absorption coefficients, which are typically measured in a reverberation chamber. However, these data may change when materials are installed. Thus, there are ongoing efforts within the community to measure the absorption characteristics of materials in situ. Of particular interest is the measurement of complex-valued impedance at low frequencies. In this study, a finite difference discretization of the homogeneous wave equation is used to estimate the pressure and normal velocity at the surface of a material sample. With this data at hand, the normal impedance of the sample can be estimated. The proposed method is verified using simulations of a reverberation chamber and a hemi-anechoic chamber. Good agreement between the simulated and estimated complex-valued impedance is found.
APA:
Prinn, A. (2025). Estimating the normal impedance of surfaces using a finite difference scheme. In Proceedings of Meetings on Acoustics. Honolulu, HI, USA: Acoustical Society of America.
MLA:
Prinn, Albert. "Estimating the normal impedance of surfaces using a finite difference scheme." Proceedings of the 189th Meeting of the Acoustical Society of America and the Acoustical Society of Japan, ASA-ASJ 2025, Honolulu, HI, USA Acoustical Society of America, 2025.
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