14 0

Modified two-thickness method for measurement of the acoustic properties of porous materials

Title
Modified two-thickness method for measurement of the acoustic properties of porous materials
Author
박준홍
Keywords
Porous material; Acoustic properties; Newton-Raphson method; Sensitivity analysis
Issue Date
2019-03
Publisher
ELSEVIER SCI LTD
Citation
APPLIED ACOUSTICS, v. 146, Page. 184-189
Abstract
In this study, a modified two-thickness method to measure acoustic properties of porous materials using surface acoustic impedance is proposed and compared to those obtained by the four-microphone impedance tube and traditional two-thickness methods. In the two-thickness method, the complex propagation constant and characteristic impedance are estimated from the measured surface acoustic impedances, and the sample thicknesses should have a ratio of two. Through the proposed method, the complex characteristic impedance and wavenumber of a porous material are calculated under arbitrary sample thicknesses condition. The surface acoustic impedances for samples of different thicknesses are measured via the two-microphone impedance tube method to estimate their complex acoustic properties. Sensitivity analysis is performed to analyze the measurement uncertainty on the resulting values. The sensitivity depended on the sample thickness and mount edge constraint in the tube. Using the method proposed in this study, acoustic properties are measured accurately with small differences in thickness and surface acoustic impedance. (C) 2018 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0003682X1830361X?via%3Dihubhttp://repository.hanyang.ac.kr/handle/20.500.11754/108582
ISSN
0003-682X; 1872-910X
DOI
10.1016/j.apacoust.2018.10.033
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