Experimental study for improving sound absorption of a composite helical-shaped porous structure using carbon fiber

Title
Experimental study for improving sound absorption of a composite helical-shaped porous structure using carbon fiber
Author
박준홍
Keywords
Carbon fiber; Mulberry layer; Random incidence absorption coefficient; Specific acoustic impedance; Empirical density equation
Issue Date
2016-06
Publisher
ELSEVIER SCI LTD
Citation
COMPOSITE STRUCTURES, v. 145, Page. 242-247
Abstract
A composite sound absorption structure constructed with fibrous layer and carbon fibers was proposed and its acoustic performance was experimentally studied. Proposed structure's sound absorption properties depended on the gap of the air cavity between fibrous layers. To increase the absorption efficiency, carbon fiber was applied between the gaps. The normal incidence sound absorption coefficients and specific acoustic impedance were measured with the two-microphone impedance tube method to determine the effects of the carbon fibers on the acoustic properties. Random incidence absorption coefficients were determined from the measured specific acoustic impedances of the proposed structures. The measured results were compared for various fractions of carbon fibers. Modified wave propagation equations with empirical density equations were suggested to predict the acoustic behavior of the proposed absorbers. After application of the carbon fibers, the composite helical-shaped sound absorber showed better sound absorption efficiency under both normal and random incidence conditions. This suggested that the carbon fibers introduced additional sound dissipation when properly distributed along the gap of the sound absorber. (C) 2016 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0263822316001045?via%3Dihubhttp://repository.hanyang.ac.kr/handle/20.500.11754/72425
ISSN
0263-8223; 1879-1085
DOI
10.1016/j.compstruct.2016.01.081
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE