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- 저자 : 권기연(Kiyoun Kwon) (검색결과 4 건)
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권기연(Kiyoun Kwon),박정민(Jungmin Park),이병채(Byeongchae Lee),채수원(Soowon Chae) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Unstructured quadrilateral mesh generation can be grouped into two main approaches: direct and indirect. In direct approaches, the domain decomposition method and the advancing front method have been widely used. Quadrilateral elements are directly generated either individually or in groups in these direct approaches. In indirect approaches, triangular elements are generated first, and through combining and splitting these triangles, quadrilateral elements are indirectly constructed. One advantage of the indirect approach is that it employs triangulation schemes for which numerous reliable algorithms have already been developed. So quadrilateral elements can be generated for any shape like STL or high distorted surfaces. A new quadrilateral mesh generation technique from an existing triangle mesh is proposed in this paper. The proposed method is based on the advancing front method and the zero thickness layers. Beginning with an initial triangular mesh, the boundary triangular elements are removed and quadrilateral elements with zero thickness are generated. The quality of the quadrilateral elements is improved during the mesh smoothing process. This procedure is repeated until all initial triangular elements are removed.
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쉘 구조물의 용접 변형량 예측을 위한 요소망 생성 방법
권기연(Kiyoun Kwon) (사)한국CDE학회 2016 한국CDE학회 논문집 Vol.21 No.2
In shipbuilding, hull assemblies are manufactured by welding. The thermal deformation caused by the welding produces shape deformation. Counter-deformed design methods have been used in shipyards to cope with the weld-induced deformation of ship assembles. Finite element methods(FEMs) are frequently used to estimate welding distortion in the counter-deformed design. For the estimation of welding distortion, producing uniform rectangular elements is required to enter thermal loads on the welding line and obtain accurate analysis results. In this paper, a new automatic mesh generation method is proposed for prediction of welding deformation in FEM. Meshes are constructed for test cases to demonstrate the feasibility of the proposed mesh generation method.
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선박 건조 과정에서 발생하는 치수 오차 분석을 위한 가중 포인트 정합 방법
권기연(Kiyoun Kwon) (사)한국CDE학회 2016 한국CDE학회 논문집 Vol.21 No.2
It is important to analyze dimensional errors occurring during shipbuilding process. A ship is constructed by assembling blocks and installing outfits in assembled ship structure. Blocks and outfits have a main direction that has greater importance than other directions from the view point of dimensional error. Therefore, a main direction should have a greater weighting factor than other directions in order to achieve meaningful inspection results. In this paper, a modified point registration method based on iterative closest point (ICP) is proposed. In this method, a user determines one or two main directions among x, y, and z directions, and then each main direction is made to have a greater weighting factor than other directions. For points registration, mapping between measured points and design points are performed by the modified ICP in which weighting factor assigned to each main direction is considered.
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박정민(Jungmin Park),권기연(Kiyoun Kwon),이병채(Byeongchae Lee),채수원(Soowon Chae) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Models in STL files or similar format are widely used in reverse engineering processes , CAD systems and analysis systems. However the models have poor geometric quality and consist of only triangles, so the models are not suitable for the finite element analysis process. We present a general method of generating quadrilateral meshes from STL models. After given triangular meshes with poor quality, the method estimates triangles and makes clusters which are connected sets of faces. The clusters are created by proposed geometric indices suitable for the quad meshing. We apply a 2D quadrilateral meshing algorithm based on a domain decomposition method on the each cluster , then quadrilateral meshes are projected into the original polygon model. Some results of the method are demonstrated.
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