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http://hdl.handle.net/10397/95532
Title: | A light-weight periodic plate with embedded acoustic black holes and bandgaps for broadband sound radiation reduction | Authors: | Tang, L Gao, N Xu, J Chen, K Cheng, L |
Issue Date: | Nov-2021 | Source: | Journal of the Acoustical Society of America, Nov. 2021, v. 150, no. 5, p. 3532-3543 | Abstract: | Conceiving lightweight structures with low vibration and sound radiation properties is an important topic. The concept of Acoustic Black Hole (ABH) offers new impetus to tackle this problem. Most existing ABH structures are based on simple ABH cells. Apart from the reduced structural strength, systematic ABH effects occur typically above the cut-on frequency of the ABH element, which is perceived as a bottlenecking problem. To tackle the problem, this paper examines the sound radiation properties of a plate comprising periodically tangled ABH cells. Through combining ABH effects with sub-wavelength bandgaps (BGs), numerical and experimental studies show that the plate exhibits reduced sound radiation properties in an ultra-broad frequency range, far below the cut-on frequency of an ABH element. This is owing to the tangled nature of the ABH elements, which extends the actual dimension of the ABH, lowers its onset frequency and reduces the sound radiation efficiency through creating slow waves. Inside the BGs, the reduced sound radiation is mainly due to the redistribution of the vibration energy, basically confined to the excitation area. Capitalizing on the combined ABH and BG features alongside improved mechanical properties, the proposed structure shows promise as a light-weight solution for broadband noise reduction. | Publisher: | Acoustical Society of America | Journal: | Journal of the Acoustical Society of America | ISSN: | 0001-4966 | EISSN: | 1520-8524 | DOI: | 10.1121/10.0007067 | Rights: | © 2021 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following article appeared in Tang, L., Gao, N., Xu, J., Chen, K., & Cheng, L. (2021). A light-weight periodic plate with embedded acoustic black holes and bandgaps for broadband sound radiation reduction. The Journal of the Acoustical Society of America, 150(5), 3532-3543 and may be found at https://doi.org/10.1121/10.0007067. |
Appears in Collections: | Journal/Magazine Article |
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