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Absorption performance optimization of perforated plate using multiple-sized holes and a porous separating partition

Title
Absorption performance optimization of perforated plate using multiple-sized holes and a porous separating partition
Author
윤길호
Keywords
Perforated plate; Multiple-sized holes; Porous separating partition; Wide-band absorption performance; Optimization; Finite element analysis
Issue Date
2017-05
Publisher
ELSEVIER SCI LTD
Citation
APPLIED ACOUSTICS, v. 120, page. 21-33
Abstract
This research proposes a new type of sound absorptive perforated plate with multiple-sized holes and a porous separating partition in an attempt to extend the sound absorption bandwidth. Separating different sized holes with a porous partition instead of a conventional rigid partition is an unprecedented idea. However, existence of a porous separating partition makes it hard to use theoretical surface impedance models to predict absorption performance. So we introduce appropriate finite element simulation method using the effective density of hole. To consider the end correction effects for hole length and viscosity length of a perforated plate, the effective density of the Johnson-Champoux-Allard model is modified and the end correction lengths of the modified effective density are corrected again in connection with finite element simulation. Material property of a porous separating partition is modeled by the Delany-Bazley material model. After constructing the finite element model, we analyzed the absorption coefficient graphs of perforated plates with two-sized holes and four-sized holes according to the separating partition types: no partition, rigid partition and porous partition. To enhance the wide-band absorption performance, flow resistivity value and thickness of a porous separating partition as well as hole sizes are optimized. From the analysis and design examples, we confirmed that the perforated plate using multiple-sized holes and a porous separating partition can make a continuous frequency range of high absorption coefficient compared to the perforated plate with a conventional rigid partition. (C) 2017 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/abs/pii/S0003682X17300117?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/114172
ISSN
0003-682X; 1872-910X
DOI
10.1016/j.apacoust.2017.01.004
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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