Low-frequency noise control using layered granular aerogel and limp porous media

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Authors
Xue, Yutong
Dasyam, Amrutha
Bolton, J. Stuart
Sharma, Bhisham N.
Advisors
Issue Date
2021-08-01
Type
Conference paper
Keywords
Acoustic noise , Acoustic wave absorption , Noise abatement , Porous materials , Sound insulating materials , Transfer matrix method
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Organizational Units
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Citation
Xue, Y., Dasyam, A., Bolton, J. S., & Sharma, B. (2021). Low-frequency noise control using layered granular aerogel and limp porous media. Paper presented at the Proceedings of INTER-NOISE 2021 - 2021 International Congress and Exposition of Noise Control Engineering, doi:10.3397/IN-2021-2215
Abstract

The acoustic absorption of granular aerogel layers with a granule sizes in the range of 2 to 40 μm is dominated by narrow-banded, high absorption regions in the low-frequency range and by reduced absorption values at higher frequencies. In this paper, we investigate the possibility of developing new, low-frequency noise reduction materials by layering granular aerogels with traditional porous sound absorbing materials such as glass fibers. The acoustic behavior of the layered configurations is predicted using the arbitrary coefficient method, wherein the granular aerogel layers are modeled as an equivalent poro-elastic material while the fibrous media and membrane are modeled as limp media. The analytical predictions are verified using experimental measurements conducted using the normal incidence, two-microphone impedance tube method. Our results show that layered configurations including granular aerogels, fibrous materials, and limp membranes provide enhanced sound absorption properties that can be tuned for specific noise control applications over a broad frequency range.

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Publisher
Institute of Noise Control Engineering
Journal
Book Title
Series
INTER-NOISE and NOISE-CON Congress and Conference Proceedings, InterNoise21;
PubMed ID
DOI
ISSN
0736-2935
EISSN