| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Sound Absorption Enhancement by Thin Multi-Slit Hybrid Structures |
| REN Shu-Wei, MENG Han, XIN Feng-Xian**, LU Tian-Jian |
State Key Laboratory for Mechanical Strength and Vibration, School of Aerospace, Xi'an Jiaotong University, Xi'an 710049
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| Cite this article: |
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REN Shu-Wei, MENG Han, XIN Feng-Xian et al 2015 Chin. Phys. Lett. 32 014302 |
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Abstract We report an extraordinary sound absorption enhancement in low and intermediate frequencies achieved by a thin multi-slit hybrid structure formed by incorporating micrometer scale micro-slits into a sub-millimeter scale meso-slit matrix. Theoretical and numerical results reveal that this exotic phenomenon is attributed to the noticeable velocity and temperature gradients induced at the junctures of the micro- and meso-slits, which cause significant loss of sound energy as a result of viscous and thermal effects. It is demonstrated that the proposed thin multi-slit hybrid structure with micro-scale configuration is capable of controling low frequency noise with large wavelength, which is attractive for applications where the size and weight of a sound absorber are restricted.
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Published: 23 December 2014
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| PACS: |
43.20.+g
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(General linear acoustics)
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43.50.+y
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(Noise: its effects and control)
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43.55.Ev
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(Sound absorption properties of materials: theory and measurement of sound absorption coefficients; acoustic impedance and admittance)
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