서지주요정보
다공질형 흡/차음재료의 음향 물성치 측정 및 흡음율 예측 = Measurement of acoustic parameters and prediction of absorption coefficient of porous soundproofing materials
서명 / 저자 다공질형 흡/차음재료의 음향 물성치 측정 및 흡음율 예측 = Measurement of acoustic parameters and prediction of absorption coefficient of porous soundproofing materials / 김정태.
저자명 김정태 ; Kim, Jeong-Tae
발행사항 [대전 : 한국과학기술원, 1997].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8007600

소장위치/청구기호

학술문화관(문화관) 보존서고

MME 97020

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

Acoustic properties of porous soundproofing materials can be predicted by using many macroscopic physical parameters. In this study, Biot's and Allard's theories are utilized for relating various parameters to each other, and after estimating all the parameters, either by measurement or prediction, the absorption coefficient of a sample is estimated. Because the measured porosity is very near to unity and the flow resistivity is very small in the polyurethane foam sample, the rigid frame model is suitable for describing the acoustic characteristics. The bulk and shear moduli of the frame are measured at low frequencies, whereas the tortuosity and characteristic lengths are estimated from the measured impedance of the foam. Although the tortuosity and characteristic lengths are tried to estimate by using the finite element model of the microstructure of the foam, the calculated values are different from measured data due to the complexity of the structure. Finally, the statistical absorption coefficient of layered polyurethane foam with a thin impervious screen are predicted from the obtained parameters. The result is compared with that measured in the reverberation room chamber, and with that estimated from the standing wave ratio in the impedance tube test. It is observed that the present result agrees reasonably well with that from other methods except at major peak band.

서지기타정보

서지기타정보
청구기호 {MME 97020
형태사항 viii, 113 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : A, 물성치 측정 장치 사용 설명서. - B, 우레탄 폼의 미세 구조로부터 α,Λ,Λ'의 예측
저자명의 영문표기 : Jeong-Tae Kim
지도교수의 한글표기 : 이정권
지도교수의 영문표기 : Jeong-Guon Ih
학위논문 학위논문(석사) - 한국과학기술원 : 기계공학과,
서지주기 참고문헌 : p. 58-60
주제 다공질형 재료
흡음재
차음재
음향 물성치
흡음율
Porous materials
Sound absorption
Acoustic parameters
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