서지주요정보
일반 경계조건을 가진 직접 음향 경계요소법의 개발 = Development of the direct acoustic boundary element method for thin-bodies with general boundary conditions
서명 / 저자 일반 경계조건을 가진 직접 음향 경계요소법의 개발 = Development of the direct acoustic boundary element method for thin-bodies with general boundary conditions / 이강덕.
저자명 이강덕 ; Ih, Kang-Duck
발행사항 [대전 : 한국과학기술원, 1996].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8006214

소장위치/청구기호

학술문화관(문화관) 보존서고

DAE 96003

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

초록정보

A new direct boundary element method (DBEM) is developed for thin bodies whose surfaces are rigid or compliant. An imaginary interface surface is constructed initially to devide the acoustic domain into an interior and an exterior subdomain. Adding the Helmholtz integral equations and the normal derivative integral eqautions for each subdomain respectively, a combined Helmholtz integral equation and a combined normal derivative integral equation for the real surface are obtained. Unlike the usual assumption, the normal velocity is assumed to be discontinuous across the thin body. The primary variables in the integral equations are the velocity potential (or pressure) jump for the rigid surface, and the normal velocity jump across the thin-body surface of different materials (or normal vibrating velocities). The normal velocity on each surface is specified by general boundary conditions; the prescribed acoustic admittance and the prescribed vibrating velocity. Then the velocity potential values on each surface can be obtained by both the combined Helmholtz integral equation and the combined normal derivative integral equation simultaneously. The hypersingular integral is regularized by using the Maue's less singular normal derivative integral equation. A standard Gaussian quadrature is used for the Maue's integral equation. Two different collocation points are used to confirm the condition at the corner and the vertex; at the nodal points for the combined Helmholtz integral equation and inside each element for the combined normal derivative integral equation. The knife-edge effect is treated by adopting a quarter-point element. The method is validated by comparison with analytic and/or numerical results for acoustic scattering and radiation from several surface conditions of the thin body; the surfaces are rigid when stationary or vibrating, and part of the interior surface is lined with a sound-absorbing material. The effect of absorbing material is investigated for complicated geometries such as cylindrical shell with one side open, and anechoic wind tunnel.

서지기타정보

서지기타정보
청구기호 {DAE 96003
형태사항 ix, 108 p. : 삽도 ; 25 cm
언어 한국어
일반주기 저자명의 영문표기 : Kang-Duck Ih
지도교수의 한글표기 : 이덕주
지도교수의 영문표기 : Duck-Joo Lee
학위논문 학위논문(박사) - 한국과학기술원 : 항공우주공학과,
서지주기 참고문헌 : p. 61-65
주제 Direct boundary element method
General boundary condition
Thin body
Acoustic
Acoustic absorbing material
QR CODE qr code