期刊
JOURNAL OF SOUND AND VIBRATION
卷 455, 期 -, 页码 324-338出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsv.2019.05.004
关键词
Vibro-acoustic properties; Cavity noise; Acoustic black hole; Coupling analysis
资金
- National Natural Science Foundation of China [11532006, 51775267]
- Research Grants Council of Hong Kong Special Administrative Region, China [PolyU 152009/15E, PolyU152017/17E]
- Natural Science Foundation of Jiangsu Province [BK20181286]
- Aeronautical Science Fund [20161552014]
- Fundamental Research Funds for the Central Universities [NE2015001]
- equipment pre-research foundation [61402100103]
- Six talent peaks project in Jiangsu Province Class C [JXQC-002]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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. (C) 2019 Elsevier Ltd. All rights reserved.
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