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Impact of surface roughness on acoustic resonators made of closed-cell lightweight foams
Publikationstyp
Conference Paper
Publikationsdatum
2021-07
Sprache
English
Institut
Citation
International Congress on Sound and Vibration (ICSV 2021)
Contribution to Conference
Scopus ID
Acoustic resonators, such as Helmholtz resonators or slit resonators, are known as a highly efficient noise control mean for narrow frequency band applications. Their simple passive structure can be built from many different materials. If a noise control treatment is highly restricted by the additional weight, those resonators could be built out of a closed-cell lightweight foam. Because of both, manufacturing reasons and the cellular microstructure of the foam, the surface of such resonators is not perfectly smooth. Especially when openings of the resonators are milled in the foam, the surface roughness inside the opening might be relatively high. This leads to a certain damped behavior of the resonator that cannot be captured by current models. In this contribution, the effect of surface roughness on the airflow resistance and its impact on the acoustic behavior of slit resonators, like the absorption coefficient or the transmission loss for wall integrated means, is studied experimentally.
Schlagworte
Broadband absorption behavior
Helmholtz resonators
Surface roughness