| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Influence of Coating Layer on Acoustic Wave Propagation in a Random Complex Medium with Resonant Scatterers |
| Hang Yang1, Xin Zhang1**, Jian-hua Guo2**, Fu-gen Wu3, Yuan-wei Yao1 |
1School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006
2School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640
3Department of Experiment Education, Guangdong University of Technology, Guangzhou 510006
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| Cite this article: |
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Hang Yang, Xin Zhang, Jian-hua Guo et al 2019 Chin. Phys. Lett. 36 084301 |
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Abstract We investigate the influence of coating layer on acoustic wave propagation in a dispersed random medium consisting of coated fibers. In the strong-scattering regime, the characteristics of wave scattering resonances are found to evolve regularly with the properties of the coating layer. By theoretical calculation, frequency gaps are found in acoustic excitation spectra in a random medium. The scattering cross section results present the evolution of scattering resonances with the properties of the coating layer, which offers a good explanation for the change of the frequency gaps. The velocity of the propagation quasi-mode is also shown to depend on the filling fraction of the coating layer. We use the generalized coherent potential-approximation approach to solve acoustic wave dispersion relations in a complicated random medium consisting of coating-structure scatterers. It is shown that our model reveals subtle changes in the behavior of the acoustic wave propagating quasi-modes.
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Received: 27 January 2019
Published: 22 July 2019
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| PACS: |
43.20.+g
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(General linear acoustics)
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43.40.+s
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(Structural acoustics and vibration)
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43.35.+d
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(Ultrasonics, quantum acoustics, and physical effects of sound)
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46.40.Cd
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(Mechanical wave propagation (including diffraction, scattering, and dispersion))
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11374066 and 11374068, the High-Level Personnel Training Project in Guangdong Province, and the Natural Science Foundation of Guangdong Province under Grant No S2012020010885. |
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