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Absorption Coefficient of a Double-Layer Inhomogeneous Micro-perforated Panel Backed with Multiple Cavity Depths

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Abstract

Double-layer micro-perforated panels (MPPs) have been studied extensively as sound absorption systems to increase the absorption performance of single-layer MPPs. However, existing proposed models indicate that there is still room for improvement regarding the frequency bands of absorption for the double-layer MPP. This study presents a double-layer MPP formed with two single MPPs with inhomogeneous perforation backed by multiple cavities of varying depths. The theoretical formulation is developed using the electrical equivalent circuit method to calculate the absorption coefficient under a normal incident sound. The simulation results show that the proposed model can produce absorption coefficient with wider absorption bandwidth compared with the conventional double- and even triple-layer MPPs. The bandwidth can be increased to higher frequency by decreasing the cavity depth behind a sub-MPP with small hole diameter and a high perforation ratio, and to lower frequency by increasing the cavity depth behind a sub-MPP with large hole diameter and a small perforation ratio. The experimental data, measured by impedance tube, are in good agreement with the predicted results.

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Acknowledgements

Part of this project is supported by the Fundamental Research Grant Scheme from the Ministry of Higher Education Malaysia No. FRGS/1/2016/TK03/FTK-CARE/F00323.

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Authors and Affiliations

  1. Fakulti Kejuruteraan Mekanikal, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100, Durian Tunggal, Melaka, Malaysia

    Ali I. Mosa, A. Putra & Al-Ameri Esraa

  2. Mechanical Engineering Department, College of Engineering, University of Baghdad, Jadriyah, Baghdad, Iraq

    Ali I. Mosa

  3. Centre for Advanced Research On Energy, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100, Durian Tunggal, Melaka, Malaysia

    R. Ramlan

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  1. Ali I. Mosa
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  2. A. Putra
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  3. R. Ramlan
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  4. Al-Ameri Esraa
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Correspondence to Ali I. Mosa.

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Mosa, A.I., Putra, A., Ramlan, R. et al. Absorption Coefficient of a Double-Layer Inhomogeneous Micro-perforated Panel Backed with Multiple Cavity Depths. Acoust Aust 48, 69–78 (2020). https://doi.org/10.1007/s40857-020-00176-4

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  • DOI: https://doi.org/10.1007/s40857-020-00176-4

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