Attenuation of Sounds in a Pipe with Shear Flow Using Layered Metamaterials
- Title
- Attenuation of Sounds in a Pipe with Shear Flow Using Layered Metamaterials
- Author
- 박준홍
- Keywords
- Metamaterials; wave propagation; acoustic-structure interaction
- Issue Date
- 2017-03
- Publisher
- WORLD SCIENTIFIC PUBL CO PTE LTD
- Citation
- JOURNAL OF COMPUTATIONAL ACOUSTICS, v. 25, no. 3, Article no. 1750008
- Abstract
- This study presents a simulation of interactions between sound and a surrounding pipe structure conveying fluid flows. A sound-attenuating structure using layered metamaterials of cylindrical shells is proposed and verified. Numerical simulations based on the finite difference method after considering steady fluid flow in the pipe were performed. The effective wave speed and density of the fluid required to determine acoustic characteristics were calculated from the transfer matrix method. This enabled estimation of noise reduction capability. The metastructure layers were lined parallel to the pipe walls to minimize flow resistance. The effective density was negative near the resonance frequency of the layers. The transmission loss predicted for a moving fluid medium was smaller than that for a stationary medium due to boundary layer formation. The proposed method can be used to design silencers to reduce the transmitted noise in pipe systems.
- URI
- https://www.worldscientific.com/doi/abs/10.1142/S0218396X17500084https://repository.hanyang.ac.kr/handle/20.500.11754/113192
- ISSN
- 0218-396X; 1793-6489
- DOI
- 10.1142/S0218396X17500084
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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