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RISS 인기검색어
- 검색키워드
- 저자 : 이완익(Wan Ik Lee) (검색결과 5 건)
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[論文] 유한 요소법을 이용한 Bellows Joint의 응력해석
이완익(Lee Wan-ik),김태완(Kim Tae-wan) 한국자동차공학회 1987 오토저널 Vol.9 No.4
The Bellows Joint which was used as a absorber or safety equipment to prevent the deformation or fracture of a structure, have been analyzed by the F.E.M using axi-symmetric conical frustum element. Using the F.E.M the general behavior of Bellows Joint corrugation can be investigated easily, and the stability of the analysis be guaranteed. In annular type corrugation, the F.E.M results were agreed with those of other theoretical analyses, but in the U type corrugation, the F.E,M results were more acceptable than those of others.
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이완익(Wan Ik Lee),김태완(Tae Wan Kim) 한국자동차공학회 1989 오토저널 Vol.11 No.2
In this paper, the bellows problem under axial load were investigated. A modified energy theory, which has the improved strain energy and stress description taken from governing equation of general shells of revolution, were proposed.From the analysis, the results obtained from the modified theory were more accurate and in stable state with varing geometric parameter of bellows than those of other theory.
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표면의 열속이 일정한 구로 부터의 정상층류 자연대류 열전달
손병진,이관수,최형철,이완익,Son Byung Jin,Lee Kwan Soo,Choi Hyung Chul,Lee Wan Ik 대한설비공학회 1982 설비저널 Vol.11 No.4
In this paper, a study is made of the steady laminar free convection boundary-layer equations on a sphere with uniform surface heat flux. To solve the boundary-layer equations, well-known Pohlhausen's simiarity solution for vertical plates is adopted just the same for spherical bodies by introducing twonondimensional parametric functions, so called azimuth functions. To determine the values of the azimuth functions which are expressed in series at the two points (the upper stagnation point and the equator), trial and error method is required. It is concluded that the heat transfer results are in good agreement with obtained from perturbation method and Von Karman-Pohlhausen method within the steady laminar free convection region for Pr=0.70.
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고병갑,박경진,이완익 한양대학교 공학기술연구소 1995 공학기술논문집 Vol.4 No.1
Bellows is a familiar component in piping systems as it provides a relatively simple means of absorbing thermal expansion and providing system flexibility. In routine piping flexibility analysis by finite element methods, bellows is usually considered to be straight pipe runs modified by an appropriate flexibility factor; maximum stresses are evaluated using a corresponding stress concentration factor. The aim of this study is to develop a bellows finite element, which similarly includes more complex shell type deformation patterns. This element also does not require flexibility or stress factors, but evaluates more detailed deformation and stress patterns. The proposed bellows element is a 3-D, 2-noded line element, with three degrees of freedom per node and no bending. It is formulated by including additional 'internal' degrees of freedom to account for the deformation of the bellows corrugation; specifically a quarter toroidal section of the bellows, loaded by axial force, is considered and the shell type deformation of this is include by way of an approximating trigometric series. The stiffness of each half bellows section may be found by minimising the potential energy of the section for a chosen deformation shape function. An experiment on the flexibility is performed to verify the reliability for bellows finite element.
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박철민,박경진,이완익 한양대학교 공학기술연구소 1992 공학기술논문집 Vol.1 No.1
General structural optimization is utilized to minimize the weight of structures while satisfying constraints imposed on stress, displacements and natural frequencies, etc.. Sandwich structures consist of inside core and outside face sheets. The selected sandwich structures are isotropic sandwich beams and isotropic sandwich plate. The face sheets are treated as membrane and assumed to carry only tensions, and the core is assumed to carry only the transverse shear. The characteristics of the varying area are considered by adding the projected component of the tension to the transverse shear. The bending theory and energy method are adopted for analyzing sandwich beams and plates, respectively. In the optimization process, the cost function is the weight of a structure, and a deflection and stress constraints are considered. Design variables are thickness and tapering coefficients which determine the shape of a structure. An existing optimization code is used for solving the formulated problems.
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