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Sound absorption structure in helical shapes made using fibrous paper

Title
Sound absorption structure in helical shapes made using fibrous paper
Author
박준홍
Keywords
Fibrous paper absorber; Absorption coefficient; Slit model; Young’s modulus
Issue Date
2015-10
Publisher
ELSEVIER SCI LTD
Citation
COMPOSITE STRUCTURES, v. 134, Page. 90-94
Abstract
This paper presents sound absorbing structure constructed using multiple layers of fibrous papers. Sound absorbing materials converts sound wave into thermal energy due to the porosity. The proposed sound absorbing structure has helical-like shapes in layered format with cyclic winding of the mulberry papers and coconut fibers. The acoustic properties changes depending on the thickness of the air cavity between the thin layers and porosity of the layers themselves. Sound absorption coefficients were measured using two-microphone impedance tube in order to investigate the acoustic property variations with porosity. The measured results were compared to predictions utilizing wave propagations through a slit for verification of the sound absorbing mechanism. A simple method for improving the sound absorption with less material by composite structure is proposed and verified through the experiment. Dynamic stiffness and loss factor of the helical-shaped sound absorbers were measured and compared by analyzing supporting properties to the vibrating beam. Depending on the construction method, the frame dynamic properties showed variation even when the sound absorption was identical. This information is required for optimal design of absorbing layers for specific noise control applications. (C) 2015 Elsevier Ltd. All rights reserved.
URI
http://hdl.handle.net/20.500.11754/28211https://www.sciencedirect.com/science/article/pii/S0263822315007163
ISSN
0263-8223; 1879-1085
DOI
10.1016/j.compstruct.2015.08.039
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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