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유한요소법을 이용한 수중 예인 선배열의 모델링 및 VIM 진동 해석
함일배,배수룡,정의봉 한국소음진동공학회 1997 소음 진동 Vol.7 No.6
This paper presents a new technique of mathematical treatment using a finite element model for analyzing the vibration of the towed line array. Since the towed line array has the axisymmetricity, axisymmetric elements are used in finite element modeling for the towed array structure. The fluid-structure interaction is also considered. The array consists of a series of identical substructures which can include internal structures such as spacers, hydrophones and ropes. That periodicity of substrucutres permits the substructure synthesis technique using characteristic wave guide for analyzing the response of towed array system. This synthesis technique can reduce the cost of computing the array response. It is suggested that a response of towed array can be computed by the finite element method and substructure synthesis technique using wave guide. Several experiments for towed array were performed to verify the present computation technique. The predicted vibration for the towed array shows good agreement with the measured result.
길이 방향 내심 장력재가 있는 유체 충진된 두꺼운 원통셸의 축대칭 진동 해석
함일배,신구균,정의봉 한국소음진동공학회 1997 소음 진동 Vol.7 No.3
A method to analyze the axisymmetric vibration and the internal pressure of the fluid filled, strength member embedded infinite cylindrical shell under the condition of axial static tension load applied is presented. As an example, the hose wall vibration and the internal pressure variation characteristics of a fluid filled infinite polyurethane hose are analyzed and dicussed, under the effects of the variation of the embedded strength members and the response positions.
배수룡,정우진,함일배,김두기,이헌곤 한국소음진동공학회 1999 소음 진동 Vol.9 No.1
Resilient mounting is effective measures to reduce the structure-borne noise and radiated noise for many applications. The acoustic stiffness (frequency-dependent stiffness) of resilient mounts is an important parameter required in order to model vibration isolation with high accuracy. It is general to use measurement method for obtaining acoustic stiffness of complex resilient mounts under static preload. In this paper, the principles of measuring acoustic stiffness were described and the developed test apparatus was introduced. Also, the feasibility of the test apparatus is illustrated by measurement results of a resilient mount.
유한요소법을 이용한 음향차폐장치용 탄성마운트 시스템 및 받침대의 진동모드 해석
정우진,배수룡,함일배 한국소음진동공학회 1999 소음 진동 Vol.9 No.3
The vibration modes of resilient mounting system and foundation structure which support diesel engine/generator set and acoustic enclosure walls play an important role in the vibration transmission process. So, it is necessary to perform vibration mode analysis of resilient mounting system and foundation structure. For some reasons, if the vibration modal analysis of resilient mounting system and foundation structure of acoustic enclosure could be simultaneously done by finite element method, it would be very efficient approach. In this paper, vibration modal analysis method using finite element method for multi stage mounting system having n d.o.f model was proposed. Vibration analysis of single and double stage resilient mounting system was performed to verify the validity of the proposed method. Also frequency response results were compared in case of rigid foundation model and finite element foundation model which was compared with experimental modal analysis results.
이종주,김좌일,김재호,함일배,Yi, Jong-Ju,Kim, Chwa-Il,Kim, Jae-Ho,Ham, Il-Bae 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.4
This paper describes about the analysis of firing rebounding force exerted on the launching system supporting structure. The measured high pressure data at the launching tube is used as external force. The maximum firing rebounding force was occurred when the snubber of inner structure contacts the surface of wall in launching tube.
균일 유동장내에서의 경사진 원형실린더의 유동유기진동 특성 연구
정태영,홍섭,문석준,함일배,이헌곤 한국소음진동공학회 1995 소음 진동 Vol.5 No.3
Tests on flow-induced vibration of inclined cylinders in uniform flow were performed in the cavitation tunnel at the Korea Instituteof Machinery and Metals. The test program was intended to investigate flow-induced vibration characteristic of the cylinders with three different inclined angles of 10$^\circ$, 20$^\circ$ and 30$^\circ$ and to estimate the fluid force coefficients acting on the cylinders. Important observations are as follows: 1) Numal drag is dominant compared with viscous drag for the inclined angle over 20.deg. and it has the value from 1.7 to 2.0 as was observed by other researchers. 2) Lift force coefficient has large value at the lock-in range determined by 4<V sin$\Theta/f_nD$<8. Measured maximum lift force coefficients at the inclined angle of 30.$^\circ$ and 20$^\circ$ were 0.9 and 0.4 respectively.