Simple multi-sections unit-cell model for sound absorption characteristics of lotus-type porous metals

This paper presents a simple multisection unit-cell model (UCM) with which to investigate the sound absorption characteristics of lotus-type porous metals (LTPMs). This model is inspired by analyzing micrographs of the LTPMs and by considering the relationship between the average pore diameter and t...

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Bibliographic Details
Published in:Physics of fluids (1994) 2019-07, Vol.31 (7)
Main Authors: Ning, Jingfeng, Li, Yueming, Zhao, Guiping
Format: Article
Language:English
Subjects:
Absorptivity
Aluminum
Fluid dynamics
Noise control
Photomicrographs
Physics
Porosity
Porous metals
Sound
Sound transmission
Tortuosity
Unit cell
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Summary:This paper presents a simple multisection unit-cell model (UCM) with which to investigate the sound absorption characteristics of lotus-type porous metals (LTPMs). This model is inspired by analyzing micrographs of the LTPMs and by considering the relationship between the average pore diameter and the porosity. The multisection UCM is used to establish the analytical relationships between the basic nonacoustic parameters (namely, flow resistivity, tortuosity, and porosity) and the sound absorption characteristics of the LTPMs. The analytical predictions are compared with existing experimental data and with analytical results from a uniform UCM. Good agreement is found between the multisections UCM and the existing experimental results. The comparative relationships of the sound absorption coefficients of the LTPMs and uniform and graded open-cell foam aluminum are plotted as well.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.5109583