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Interior Noise Reduction of Enclosure Using Predicted Characteristics of Absorber  

Lee Ghi-Youn (현대-기아 자동차 연구소 차량설계 팀)
Sim Hyoun-Jin (한양대학교 기계공학과)
Lee Jung-Yoon (경기대학교 기계시스템디자인공학부)
Oh Jae-Eung (한양대학교 기계공학부)
Publication Information
Journal of the Korean Society for Precision Engineering / v.23, no.4, 2006 , pp. 60-66 More about this Journal
Abstract
For the purpose of finding out the sound field characteristics in a rectangular cavity, analytical and experimental studies are performed with white noise input. Two-microphone impedance tube method is used to measure the impedances of foamed aluminum. Foamed aluminum is well known metallic porous material which has excellent properties of light weight and high absorbing performance. And predicted impedances of foamed aluminum are compared with measured impedances. The predicted acoustical parameters are applied to the theoretical analysis to predict sound pressure field in the cavity. The measured sound absorption effects are compared with the predicted values for both cases with and without foamed aluminum lining in the cavity of the rectangular enclosure.
Keywords
Normalized Impedance; Admittance; Foamed Aluminum; Porous Sound Absorber;
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