서지주요정보
박막과 음장의 연성을 이용한 덕트 소음 저감 방법 = Duct noise reduction by using membrane
서명 / 저자 박막과 음장의 연성을 이용한 덕트 소음 저감 방법 = Duct noise reduction by using membrane / 전종훈.
저자명 전종훈 ; Jeon, Jong-Hoon
발행사항 [대전 : 한국과학기술원, 2004].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8014958

소장위치/청구기호

학술문화관(문화관) 보존서고

MME 04060

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

Noise reduction systems by structural-acoustic coupling using membrane are proposed in order to overcome the geometric restriction of the reactive muffler such as an expansion chamber. The expansion chamber has a disadvantage taking up excessive space for installation to get higher noise reduction performance. In this study, methods of leading impedance mismatching by structural motion are proposed. The suggested systems are compared with an expansion chamber. Theoretical analysis is conducted using modal expansion approach, which enables predictions of transmission loss. First, noise reduction system using membrane and a cavity is suggested. Membrane is installed as a part of the duct wall and an air cavity is covered outside the membrane-duct system to prevent breakout noise. In this case membrane is coupled with the air inside the cavity and duct, which causes rapid impedance mismatching and noise reduction. Theoretical prediction and experimental results show good noise reduction performance which is valid for narrow band low frequency. Second, membrane is installed inside the duct vertical to the direction of plane wave propagation. This system is suggested in order to give no volume change to the rigid duct. The frequency at which the maximum transmission loss occurs is found to be near the natural frequency of the installed membrane. Analytical method shows good agreements with the experimental results in predicting the frequency at which the maximum transmission loss occurs. From the two cases, we can infer that noise reduction using membrane is applicable to the system where the narrow band noise control with lower geometric restriction than the expansion chamber is needed.

서지기타정보

서지기타정보
청구기호 {MME 04060
형태사항 iii, 108 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : A, Chung & Blaser의 transfer function method을 이용한 투과 손실 측정. - B, 박막 및 음장의 모드 수에 따른 투과 손실의 수렴성
저자명의 영문표기 : Jong-Hoon Jeon
지도교수의 한글표기 : 김양한
지도교수의 영문표기 : Yang-Hann Kim
학위논문 학위논문(석사) - 한국과학기술원 : 기계공학전공,
서지주기 참고문헌 : p. 98-99
주제 박막
연성
덕트
소음
membrane
coupling
duct
noise
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