Anisotropic acoustical properties of sintered fibrous metals

Meng, Han, Ao, Q.B., Ren, S.W., Xin, F.X., Tang, H.P. and Lu, T.J. (2015) Anisotropic acoustical properties of sintered fibrous metals. Composites Science and Technology, 107. pp. 10-17. ISSN 0266-3538

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A combined theoretical and experimental study is carried out to investigate the anisotropic acoustic properties of sintered fibrous metals. In the theoretical model, based on the transversal and longitudinal dynamic mass densities and effective bulk modulus of randomly placed parallel fibers, the dynamic mass densities and effective dynamic bulk modulus of a sintered fibrous metal in the direction normal and parallel to its surface are obtained. Sound absorption coefficient, sound speed and attenuation coefficient in each of the two directions are calculated once the dynamic mass densities and effective dynamic bulk modulus are determined. For validation, experimental measurements are performed, with good agreement between theoretical prediction and measurement data achieved. Subsequent numerical investigations focus on the influence of fiber diameter and porosity on the anisotropic acoustical properties of the sintered fibrous metal. The sintered fibrous metal exhibits better sound absorption/attenuation performance in the parallel direction than in the normal direction. The anisotropy in acoustical properties increases with decreasing fiber diameter and porosity due mainly to increasing interactions between adjacent fibers.

Item Type: Article
Uncontrolled Keywords: Fibers, Mechanical properties, Anisotropy, Acoustic emission
Subjects: H100 General Engineering
H300 Mechanical Engineering
H800 Chemical, Process and Energy Engineering
H900 Others in Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Rachel Branson
Date Deposited: 17 Aug 2020 09:37
Last Modified: 31 Jul 2021 12:18

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