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http://hdl.handle.net/10397/95590
Title: | Noise reduction inside a cavity coupled to a flexible plate with embedded 2-D acoustic black holes | Authors: | Ji, H Wang, X Qiu, J Cheng, L Wu, Y Zhang, C |
Issue Date: | 1-Sep-2019 | Source: | Journal of sound and vibration, 1 Sept. 2019, v. 455, p. 324-338 | Abstract: | Acoustic black hole (ABH) structures have been exploited to manipulate the flexural wave propagation with results showing a great potential for structural vibration damping enhancement and suppression of free-field acoustic noise radiation. In the present paper, ABHs are used to reduce the noise inside a cavity bounded by a flexible plate with multiple two-dimensional (2-D) ABH indentations. The interior sound field is generated by and fully coupled to the vibration of the flexible plate subject to a point force excitation. A refined numerical finite element model considering the plate-cavity coupling is established and validated by experiments. Both the simulation and experimental results show a significant noise reduction inside the cavity in a relatively wide frequency range through embedding the 2-D ABHs into the flexible plate. Analyses on the underlying mechanisms show a dual physical process of the ABH effects: the first being the direct consequence of the vibration reduction of the plate as a result of ABH-induced damping enhancement, whilst the second one being caused by a reduction in the coupling strength between the plate and the cavity. This ABH-specific decoupling phenomenon is characterized by the spatial coupling coefficients, which depend on the degree of morphological matching between structural modes and acoustic modes over the plate-cavity interface. The reported phenomenon of the impaired structural-acoustic coupling reveals a new ABH-specific feature which enriches the existing knowledge on ABH structures. | Keywords: | Acoustic black hole Cavity noise Coupling analysis Vibro-acoustic properties |
Publisher: | Academic Press | Journal: | Journal of sound and vibration | ISSN: | 0022-460X | EISSN: | 1095-8568 | DOI: | 10.1016/j.jsv.2019.05.004 | Rights: | © 2019 Elsevier Ltd. All rights reserved. © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Ji, H., Wang, X., Qiu, J., Cheng, L., Wu, Y., & Zhang, C. (2019). Noise reduction inside a cavity coupled to a flexible plate with embedded 2-D acoustic black holes. Journal of Sound and Vibration, 455, 324-338 is available at https://doi.org/10.1016/j.jsv.2019.05.004 |
Appears in Collections: | Journal/Magazine Article |
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Ji_Noise_Reduction_Inside.pdf | Pre-Published version | 4.97 MB | Adobe PDF | View/Open |
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