• 제목/요약/키워드: FE-BEM

검색결과 33건 처리시간 0.019초

FE-BEM을 결합한 벽체의 해석모델 개발 (Development of a Wall Analysis Model Grafting FE-BEM)

  • 정남수;최원;이호재;김한중;이정재;김종옥
    • 한국농공학회논문집
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    • 제46권5호
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    • pp.61-68
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    • 2004
  • Methodologies of the finite element and boundary element are combined to achieve an efficient and accurate analysis model of frame structure containing shear wall. This model analyzes the frame by employing the finite element method and the shear wall by boundary element method. This study is applicable to a specific situation, where the boundary element is surrounded by finite elements. By employing FE dominant method in which boundary stiffness matrix is transformed into finite element stiffness matrix, boundary element and finite element method are combined to analyze frame structure with walls.

FE-BEM 및 SEA 해석 기법을 활용한 샌드위치 복합재 구조물의 전 주파수 대역 음향 해석 (Full-Frequency Band Acoustic Analysis of Sandwich Composite Structure Using FE-BEM and SEA Method)

  • 이대은;이윤규;김홍일;김재영
    • 한국군사과학기술학회지
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    • 제21권4호
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    • pp.422-428
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    • 2018
  • Increase in use of lightweight structures, coupled with the increased acoustic loads resulting from larger and longer range guided missiles, has made missile more susceptible to failures caused by acoustic loads. Thus, accurate prediction of acoustic environment and the response is becoming ever more important for mission success. In this paper, the acoustic response of a sandwich composite skin structure to diffuse acoustic excitation is predicted over a broad frequency range. For the low frequency acoustic analysis, coupled FE-BEM method is used where the structure is modeled using FEM and the interior and exterior fluid is modeled using BEM. For the high frequency region, statistical energy analysis is applied. The predicted acoustic level inside the structure is compared with the result from acoustic test conducted in reverberation chamber, which shows very good agreement.

Simulation of magnetostrictive Terfenol-D rod dynamics using a coupled FE-BEM

  • 장순석
    • 센서학회지
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    • 제8권4호
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    • pp.298-307
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    • 1999
  • This paper describes the application of the coupled FE-BEM (finite element-boundary element method) for the numerical harmonic analysis of the linear dynamic behaviour of a magnetostrictive Terfenol-D rod in water. The magnetostrictive rod is three-dimensionally simulated to transduce applied electric current in a helical coil around the rod to mechanical displacement. The theoretical derivation of the magnetostrictive matrix equation is described in detail. The steady-state resonance response of the displacement is shown. In addition, the directivity pattern and the radiation impedance are also shown.

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유한요소법과 경계요소법의 교호적용에 의한 와전류장 해석 (A Numerical Calculation of Eddy Current Field by Applying FEM and BEM Alternately)

  • 임재원
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제49권7호
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    • pp.457-461
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    • 2000
  • The finite element method (FEM) is suitable for the analysis of a complicated region that includes nonlinear materials, whereas the boundary element method (BEM) is naturally effective for analyzing a very large region with linear characteristics. Therefore, considering the advantages in both methods, a novel algorithm for the alternate application of the FEM and BEM to magnetic field problems with the open boundary is presented. This approach avoids the disadvantages of the typical numerical methods with the open boundary problem such as a great number of unknown values for the FEM and non-symmetric matrix for the Hybrid FE-BE method. The solution of the overall problems is obtained by iterative calculations accompanied with the new acceleration method.

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A Study on Correlation Between Pressure Variations and Augmentation of Heat Transfer in Acoustic Fields

  • Oh, Yool-Kwon;Yang, Ho-Dong
    • Journal of Mechanical Science and Technology
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    • 제18권9호
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    • pp.1630-1639
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    • 2004
  • The present paper investigated the correlation between the acoustic pressure variations and the augmentation of heat transfer in the ultrasonic induced acoustic fields. The augmentation ratios of heat transfer coefficient were experimentally measured and were compared with the profile of the pressure distribution in the acoustic fields predicted by numerical analysis. For numerical analysis, a coupled finite element-boundary element method (coupled FE-BEM) was applied. The results of the present study reveal that the acoustic pressure is higher near two ultrasonic transducers than other points where no ultrasonic transducer was installed. The augmentation trend of heat transfer is similar with the profile of the acoustic pressure distribution. In other words, as the acoustic pressure increases, the higher augmentation ratio of heat transfer is obtained. Numerical and experimental studies clearly show that the acoustic pressure variations are closely related to the augmentation of heat transfer in the acoustic fields.

결합형 유한요소-경계요소 기법을 사용한 압전체 유연형 쏘나 변환기 시뮬레이션 (Simulation of a piezoelectric flextentional sonar transducer using a coupled FE-BEM)

  • Jarng, Soon-Suck
    • 한국정보통신학회:학술대회논문집
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    • 한국해양정보통신학회 1999년도 춘계종합학술대회
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    • pp.307-312
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    • 1999
  • 결합형 유한요소-경계요소 기법을 사용하여 압전체 유연형 쏘나 변환기를 시뮬레이션하였다. 쏘나 변환기의 역학적 구동을 3차원적으로 모델링하였고 전기적 외부 부하 조건을 가지고 분석하였다. 정상 상태 변위 모드와 방향 패턴과 같은 결과들을 보여준다. 본 논문의 술통 형태의 압전 재질 쏘나 변환기는 유연형 변위를 발생시키며, 다른 형태의 쏘나 변환기와 달리 고출력, 낮은 Q-factor, 향상된 전방위성을 가지도록 해준다.

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초음파 진동 가진시 발생하는 압력과 열전달 촉진과의 상관관계에 관한 연구 (A Study on Correlation Between Acoustic Pressure and Heat Transfer Augmentation via Ultrasonic Vibration)

  • 오율권;양호동
    • 한국가시화정보학회:학술대회논문집
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    • 한국가시화정보학회 2004년도 추계학술대회 논문집
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    • pp.22-25
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    • 2004
  • The present paper investigated the correlation between acoustic pressure and heat transfer augmentation in acoustic fields. The acoustic pressure predicted by numerical work and compared with the augmentation ratio of heat transfer coefficient was experimentally measured. Also, particle image velocimetry(PIV) was used for the visualization of velocity vectors and kinetic energy distribution inside liquid region. For the numerical work, SVS programed with Fortran language and based on a coupled FE-BEM was used. Results of the present study, the acoustic pressure is increased by $60\%$ and the largest augmentation of heat transfer about $28\%$ was measured. Finally, the profiles of acoustic pressure is consistent with that of augmentation of heat transfer. It is concluded that a correlation exists between the acoustic pressure and the heat transfer augmentation.

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Optimal Design of Deep-water 30kHz Omnidirectional Sonar Transducer Using a Coupled FE-BEM

  • Jarng, Soon-Suck
    • The Journal of the Acoustical Society of Korea
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    • 제18권4E호
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    • pp.3-9
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    • 1999
  • Deep-water sonar transducers of FFR (Free Flooded Ring) type have been designed using a coupled FE-BEM. The proposed sonar transducers are composed of piezoelectric ceramic tubes and structural steel materials for simple fabrication. In order to have an omnidirectional beam pattern around 30kHz, a conic steel is placed below a piezoelectric tube or a steel disc is placed between two piezoelectric tubes. The dynamics of the sonar transducer is modelled in three dimensions and is analyzed with external electrical excitation conditions. Various results are available such as directivity patterns and transmitting voltage responses. The most optimal structure and dimensions of the steel material were calculated, so that the beam patterns of the sonar transducers had +/- 3dB omnidirectivity at 30kHz.

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FE-BEM을 이용한 뼈대구조물의 해석모델 개발(구조 및 재료 \circled1) (Development of the Analytical Model for Frame Structures using FE-BEM)

  • 최원;나준엽;김한중
    • 한국농공학회:학술대회논문집
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    • 한국농공학회 2000년도 학술발표회 발표논문집
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    • pp.246-252
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    • 2000
  • This paper presents an explanatory study of combining the finite element and boundary element methods to achieve an efficient and accurate analysis of frame structure containing shear wall. This model analyzes the frame by finite element method and the shear wall by boundary element method. The purpose of this study is the specific case that boundary element is surrounded by finite element. If material properties of shear wall are relatively the very smaller than it of frame structure, the displacement shape of each node is calculated exactly. And if the solution of displacement is the larger, the displacement shape is approximated more accurately.

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유한요소법과 경계요소법의 교호적용에 의한 무한영역해석 (A Numerical Calculation of Open Boundary Problem by Applying FEM and BEM Alternately)

  • 임지원
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 A
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    • pp.130-132
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    • 1999
  • The finite element method (FEM) is suitable for the analysis of a complicated region that includes nonlinear materials, whereas the boundary element method (BEM) is naturally effective for analyzing a very large region with linear characteristics. Therefore, considering the advantages in both methods, a novel algorithm for the alternate application of the FEM and BEM to magnetic field problems with the open boundary is presented. This approach avoids the disadvantages of the typical numerical methods with the open boundary problem such as a great number of unknown values for the FEM and non-symmetric matrix for the Hybrid FE-BE method. The solution of the overall problems is obtained by iterative calculations accompanied with the new acceleration method.

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