서지주요정보
Helmholtz 적분방정식을 이용한 임의 형상 음원의 재현과 음장 예측 = Abitrarily-shaped sound source reconstruction and field prediction using the helmholtz integral equation
서명 / 저자 Helmholtz 적분방정식을 이용한 임의 형상 음원의 재현과 음장 예측 = Abitrarily-shaped sound source reconstruction and field prediction using the helmholtz integral equation / 김규태.
저자명 김규태 ; Kim, Gyu-Tae
발행사항 [대전 : 한국과학기술원, 1990
Online Access 원문보기 원문인쇄

소장정보

등록번호

8000280

소장위치/청구기호

학술문화관(문화관) 보존서고

DME 9001

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

초록정보

A method for reconstruction of boundary conditions of an arbitrarily shaped three dimensional sound source from a finite number of significant figure of field pressures is presented and the associated sound field is predicted by using the Helmholtz integral equation. To minimize the reconstruction error due to noise in the field pressures, a filtering method is proposed and it is verified that numerically singular values which correspond to the higher-order modes of the evanescent-like components of the source velocities are eliminated. For arbitrarily shaped sources with complex boundary conditions, source reconstruction is performed accurately when the size of each element is about a quarter wavelength and the field measurement positions are equally or randomly distributed on the surface of sphere in the vicinity of the source. High performance is obtained for a measurement surface which is very closed to the sound source since the rapidly decaying evanescent-like components of the source velocities can be detected much. The reconstruction error of higher order evanescent-like components does not affect the reprediction of its associated field. Therefore, it is desirable to estimate the reconstruction efficiency on the basis of the accuracies of the repredicted near field pressures and acoustic power in cases when one reconstructs the source boundary conditions in order to repredict the total sound field. Our technique can be used in computer-aided loudspeaker design that reconstructs loudspeaker diaphragm velocities from finite number of measured field pressures and repredicts the variation of the sound field produced by redesigned loudspeaker cabinets on which the reconstructed diaphragm are mounted. The method thus provides a new way in which acoustic measurement can be used to determine vibration patterns, and consequently further possibilities for non-contacting investigation of the velocities of sound source such as loudspeaker diaphragm.

서지기타정보

서지기타정보
청구기호 {DME 9001
형태사항 [vii], 103 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 수록
저자명의 영문표기 : Gyu-Tae Kim
지도교수의 한글표기 : 이종원
공동교수의 한글표기 : 이병호
지도교수의 영문표기 : Chong-Won Lee
공동교수의 영문표기 : Byung-Ho Lee
학위논문 학위논문(박사) - 한국과학기술원 : 기계공학과,
서지주기 참고문헌 : p. 54-58
주제 Sound pressure.
Loudspeakers.
Acoustic filters.
Diaphragms.
음향 해석. --과학기술용어시소러스
음장. --과학기술용어시소러스
음원. --과학기술용어시소러스
스피커. --과학기술용어시소러스
잡음 억제. --과학기술용어시소러스
Helmholtz equation.
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