Please use this identifier to cite or link to this item:
http://hdl.handle.net/10397/106457
Title: | Sound radiation and transonic boundaries of a plate with an acoustic black hole | Authors: | Ma, L Cheng, L |
Issue Date: | Jan-2019 | Source: | Journal of the Acoustical Society of America, Jan. 2019, v. 145, no. 1, p. 164-172 | Abstract: | The acoustic black hole (ABH) phenomenon has shown promise for noise and vibration control applications. In this paper, a two-dimensional (2-D) Daubechies wavelet (DW) model is established for the sound radiation prediction of plates embedded with a circular ABH indentation. ABH plates are shown to exhibit a reduced sound radiation efficiency as compared with their flat counterpart. Below the critical frequency, this is caused by the weakening of the structural stiffness due to the ABH indentation. Above the critical frequency, a subsonic region inside the ABH cell may appear, containing acoustically slow structural waves. This region, confined within a transonic boundary, is due to the ABH-specific phase velocity reduction of the bending waves. Drawing energy away from the supersonic region of the plate, this subsonic region warrants a reduced sound radiation to the far field. Numerical results on the investigated configuration show an increase in the sound radiation efficiency due to the added stiffness effect of damping layers. Sound radiation efficiency alongside the transonic boundary changes is scrutinized and quantified. Visualization of the supersonic acoustic intensity and radiation allows identifying the effective sound radiation regions of ABH plates and their relationship with the transonic boundaries at different frequencies. | Publisher: | AIP Publishing LLC | Journal: | Journal of the Acoustical Society of America | ISSN: | 0001-4966 | EISSN: | 1520-8524 | DOI: | 10.1121/1.5081680 | Rights: | © 2019 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 Li Ma, Li Cheng; Sound radiation and transonic boundaries of a plate with an acoustic black hole. J. Acoust. Soc. Am. 1 January 2019; 145 (1): 164–172 and may be found at https://doi.org/10.1121/1.5081680. |
Appears in Collections: | Journal/Magazine Article |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
164_1_online.pdf | 2.92 MB | Adobe PDF | View/Open |
Page views
8
Citations as of Jun 30, 2024
SCOPUSTM
Citations
3
Citations as of Jul 4, 2024
WEB OF SCIENCETM
Citations
65
Citations as of Jul 4, 2024
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.