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이현승(Hyun-Seung Lee),이영신(Young-Shin Lee),백준호(Joon-Ho Baek),천병선(Byong-Sun Chun),김석윤(Suk-Yoon Kim),이재옥(Jae-Wook Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The wedge-type pipe joint which is adapted for pipelines can improve workability, functionability and economical aspects significantly more than existing pipe joint. The work is significantly reduced because wedge-type pipe joint can joining pipe by one ?touch action. The wedge-type pipe joint is composed of wedge-type stopper, spring and housing. The wedge-type stopper moves along the tilted surface of the housing and securely fixes the pipe. In this study, the structural contact analysis on multi-groove stopper of the wedge-type pipe joint is carried out by finite element analysis. Results of the contact analysis according to housing angle, optimized angle of housing are 9.75°.
상용 CAD와 연계한 후판 구조의 아이소-지오메트릭 해석
이승욱,구본용,윤민호,이재옥,조선호,Lee, Seung-Wook,Koo, Bon-Yong,Yoon, Min-Ho,Lee, Jae-Ok,Cho, Seon-Ho 한국전산구조공학회 2011 한국전산구조공학회논문집 Vol.24 No.3
The finite element method (FEM) has been used for various fields like mathematics and engineering. However, the FEM has a difficulty in describing the geometric shape exactly due to its property of piecewise linear discretization. Recently, however, a so-called isogeometric analysis method that uses the non-uniform rational B-spline(NURBS) basis function has been developed. The NURBS can be used to describe the geometry exactly and play a role of basis functions for the response analysis. Nevertheless, constructing the NURBS basis functions in analysis is as costly as a meshing process in the FEM. Since the isogeometric method shares geometric data with CAD, it is possible to intactly import the model data from commercial CAD tools. In this paper, we use the Rhinoceros 3D software to create CAD models and export in the form of STEP file. The information of knot vectors and control points in the NURBS is utilized in the isogeometric analysis. Through some numerical examples, the accuracy of isogeometric method is compared with that of FEM. Also, the efficiency of the isogeometric method that includes the CAD and CAE in a unified framework is verified. 유한요소법은 수학과 공학을 비롯한 다양한 분야에서 활용되고 있으나 해석대상을 유한 개의 다각형 요소로 분할하여 모델링하기 때문에 기하학적인 형상을 정확하게 기술하지 못하는 어려움이 있다. 그러나 최근에는 NURBS(Non-Uniform Rational B-Spline)를 기저함수로 사용하는 아이소-지오메트릭 해석법(Isogeometric analysis)이 개발되었는데 NURBS는 기하학적 모델을 정확하게 표현할 수 있을 뿐만 아니라 해석의 기저함수로서 응답해석에 사용될 수 있다. 그러나 NURBS 기저함수를 해석에서 따로 구성하는 일은 유한요소해석에서 요소망을 구성하는 만큼 시간과 노력이 많이 요구된다. 아이소-지오메트릭 해석법은 CAD(Computer-Aided Design)와 기하학적 정보를 공유할 수 있기 때문에 CAD 코드로 부터 해석모델의 정보를 직접 얻는 것이 가능하다. 본 논문에서는 상용 CAD 코드인 Rhinoceros 3D를 이용하여 CAD 모델을 작성하고 이를 STEP 파일로 출력하여 NURBS의 노트벡터와 조정점 등의 정보를 아이소-지오메트릭 해석법에 활용하는 기법을 소개한다. 몇몇 수치예제를 통하여 아이소-지오메트릭 해석법의 정확도를 유한요소해석 결과와 비교하여 검증하고, 상용 CAD와 CAE(Computer-Aided Engineering)가 결합된 아이소-지오메트릭 해석법의 효율성을 입증한다.
3-D Beam 요소 인체모델을 이용한 사격충격 구조해석
이세훈(Se-Hoon Lee),이영신(Young-Shin Lee),최영진(Young-Jin Choi),이재옥(Jae-Ok Lee),채제욱(Je-Wook Chae),최의중(Eui-Jung Choi) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The rifle impact of human body is affected by the posture of human for rifling. The human model of shooting posture is defined by the action of shooter. The shooting impact of the rifle is transferred to the human model. In this study a finite element analysis has been performed in order to investigate the human body impact by shooting of rifle. The model(height 170 ㎝, weight 60 ㎏) is developed by finite element method using beam elements. The human body impulse is analyzed by the ANSYS 8.1 code. The human impact analysis of stand shooting posture, knee shooting posture and prone shooting posture is investigated. In this study, the rifle used for the impulse analysis is K2. The applied load for the simulation inputs is about 4 kN. As the results, the displacement and stress of human body is presented.
이세훈(Se-Hoon Lee),이영신(Young-Shin Lee),최영진(Young-Jin Choi),이재옥(Jae-Ok Lee),최의중(Eui-Jung Choi),체재욱(Je-Wook Chae) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
On the human-rifle system, the human body is affected by the firing impact. The firing impact will reduce the firing accuracy and change the initial shooting posture. Therefore the study of biomechanical characteristics using human-rifle modeling and numerical investigation is needed. The muscle-skeleton model is developed by finite element method using beam and spar elements. In this study structural analysis has been performed in order to investigate the human body impact by firing of 5.56㎜ small caliber machine gun. The firing experiments with stand shooting posture performed to verify analytical results. The result if this study shows analytical displacements of the human-rifle system and experimental displacements of the real firing. As the results, the analytical displacement and stress of human body is presented.
김은옥,이종구,이철환,박성욱,송재훈,명승재,배직현,이재옥 대한내과학회 1994 대한내과학회지 Vol.46 No.3
Cardiobacterium hominis and Actinobacillus actinomycetemcomitans are fastidious gram negative bacilli that rarely cause bacterial endocarditis. We report a case of A. actinomycetemcomitans bacterial endocarditis developed 16 months after treatment of C. hominis bacterial endocarditis. A. actinomycetemcomitans was repeatedly isolated from the blood cultures of a 47-year-old man with known mitral insufficiency who developed subacute bacterial endocarditis. Sixteen months earlier C, hominis bacterial endocarditis was successfully treated with 4 weeks of intravenous antibiotics therapy. After 6~10 days of incubation, 4 of 18 blood cultures grew a gram-negative coccobacillus later identified as A. actinomycetemcomitans. After 7 weeks of intravenous administration of penicillin-G 20 million units per day and gentamicin 3 mg/kg per day, he underwent mitral valve replacement with valvular prosthesis.