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Sound transmission through triple plates separated by air cavities in the low-frequency range

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Abstract

A theoretical study of sound transmission in rigid duct through clamped triple plates separated by two impervious air cavities is formulated. The vibrating motion of the plates and the sound pressure field are expanded in terms of an infinite series of the modal functions. The accuracy of the theoretical predictions is first checked against experimental and numerical results, with good agreement achieved. The model predictions are then used to explore the influence of key parameters on the sound isolation capability of the triple-plate configuration, including the thickness of the plates and that of the air cavities. Furthermore, the sound transmission loss (STL) of the triple-plate model is compared with that of a double plate. Results showed that replacing the double plates with three plates while keeping the air cavity gaps between the plates the same degrades the STL in the low-frequency range. However, using the triple plates is more suitable to enhance the sound insulation performance when enough space is available.

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Acknowledgements

The authors appreciate the Micromechanics Research Group in the Department ofMechanics of the Beijing Institute of Technology under the leadership of Professor Gengkai Hu, for their support in conducting this research study.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, Faculty of Engineering, University of Lagos, Lagos, Nigeria

    Akintoye Olumide Oyelade & Obanishola Mufutau Sadiq

  2. Department of Systems Engineering, Faculty of Engineering, University of Lagos, Lagos, Nigeria

    Omotayo A. Fakinlede

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  1. Akintoye Olumide Oyelade
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  2. Obanishola Mufutau Sadiq
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  3. Omotayo A. Fakinlede
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Correspondence to Akintoye Olumide Oyelade.

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Oyelade, A.O., Sadiq, O.M. & Fakinlede, O.A. Sound transmission through triple plates separated by air cavities in the low-frequency range. Acta Mech 230, 965–977 (2019). https://doi.org/10.1007/s00707-018-2318-9

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  • DOI: https://doi.org/10.1007/s00707-018-2318-9

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