Journal
JOURNAL OF SOUND AND VIBRATION
Volume 512, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsv.2021.116375
Keywords
Metaporous layer; Sound power dissipation; Directional quantification; Power decomposition; Acoustic metamaterials
Categories
Funding
- Global Frontier R&D Program on Center for Wave Energy Control based on Metamaterials - Korea Ministry of Science, ICT & Future Planning through the Institute of Advanced Machines and Design at Seoul National University in Korea [2014M3A6B3063711]
- Chungnam National University
- Basic Science Research Program - Korea Ministry of Education through Chungnam National University [2018R1D1A1B07049771]
- National Research Foundation of Korea [2018R1D1A1B07049771] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The insertion of rigid inclusions into metaporous layers can greatly enhance sound absorption by generating multidirectional effects to dissipate sound power. Quantitative studies on the directional characteristics of sound power dissipation in metaporous layers are relatively rare, highlighting the importance of directional quantification for better designs and performance interpretation.
Metaporous layers composed of finite-length porous layers with rigid inclusions embedded have recently received much attention given their ability to greatly enhance sound absorption. Compared with homogeneous porous layers, the insertion of rigid inclusions into porous layers can lead to a significant enhancement in the sound-absorbing performance. It is because the resulting inhomogeneity in metaporous layers generates multidirectional effects to dissipate the sound power, which may not be observed in homogeneous porous layers. This implies that directional evaluations of sound power dissipation in metaporous layers can be important for better designs that yield further enhancements of the sound-absorbing performance. In most previous works related to metaporous layers, unfortunately, quantitative studies of the directional characteristics of sound power dissipation inside of the layers are relatively rare. In this work, we investigate the directional effect of rigid inclusions on the dissipation of sound power in metaporous layers quantitatively. By spatially decomposing the dissipated power in orthogonal directions, the directional characteristics of sound power dissipation are evaluated along the thickness and lateral directions of hard-backed metaporous layers. The present directional quantification provides greater insight for those attempting to interpret the performance capabilities of metaporous layers and can be applied as well to the creation of optimal designs for these types of layers.
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