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- Title
Mathematical Models and Experiments on the Acoustic Properties of Granular Packing Structures (Measurement of Tortuosity in Hexagonal Close-Packed and Face-Centered Cubic Lattices).
- Authors
Sakamoto, Shuichi; Suzuki, Kyosuke; Toda, Kentaro; Seino, Shotaro
- Abstract
In this study, the sound absorption characteristics of hexagonal close-packed and face-centered cubic lattices were estimated by theoretical analysis. Propagation constants and characteristic impedances were obtained by dividing each structure into elements perpendicular to the incident direction of sound waves and by approximating each element to a clearance between two parallel planes. Consequently, the propagation constant and the characteristic impedance were treated as a one-dimensional transfer matrix in the propagation of sound waves, and the normal incident sound absorption coefficient was calculated by the transfer matrix method. The theoretical value of the sound absorption coefficient was derived by using the effective density applied to the measured tortuosity. As a result, the theoretical value was becoming closer to the measured value. Therefore, the measured tortuosity is reasonable.
- Subjects
ACOUSTIC models; ABSORPTION of sound; MATHEMATICAL models; TORTUOSITY; TRANSFER matrix; ABSORPTION coefficients
- Publication
Materials (1996-1944), 2022, Vol 15, Issue 20, p7393
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma15207393