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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.
권기연(Ki-Youn Kwon) (사)한국CDE학회 2017 한국CDE학회 논문집 Vol.22 No.1
Sharing of CAD data plays a key role in the PLM and a lightweight model is widely used for visualizing and sharing a large data. The lightweight model is mainly composed of triangular elements to minimize file size. There is no problem at all to visually confirm the shape based on these triangular elements but there is a limit to numerically calculate the exact position on the curve or surface. In this paper, a boundary curve generation method using triangular elements is proposed to increase the utilization of lightweight models. After matching connectivity of triangular elements, boundary element edges are extracted. Boundary curves are generated by connecting of these boundary element edges. This proposed method has been tested on several models to demonstrate the feasibility.
선박 건조 치수품질 관리를 위한 계측시스템 적용현황 연구
권기연(Ki-Youn Kwon) (사)한국CDE학회 2017 한국CDE학회 논문집 Vol.22 No.3
A ship is constructed by assembling blocks and installing outfits in assembled ship structures. So, it is important to control dimensional errors occurring during a shipbuilding process. In order to prevent repairing and reworking, a dimensional quality management is needed as follows: the FAT (factory acceptance test) of manufactured parts and outfits, inspection of modular structures, inspection of outfit installations and positioning control of assembly module. Many 3D measurement instruments are being utilized for dimensional inspections. This paper summarizes the applications and main features of 3D measurement instruments for ship construction.
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.
자전거를 이용하는 항만근로자들의 안전을 위한 파손 도로 탐지 딥러닝 디바이스, “Safe Bike(Sabi)”
권기연 ( Giyeon Kwon ),박기현 ( Gihyun Park ),이유빈 ( Yubin Lee ),이은지 ( Eunji Lee ),권태호 ( Taeho Kwon ) 한국정보처리학회 2020 한국정보처리학회 학술대회논문집 Vol.27 No.2
자전거를 이용해 출퇴근하는 항만 근로자들은 대형화물이 만들어낸 포트홀과 같은 파손된 도로에 의해 위협받는다. 이러한 문제를 해결하기 위해 센서와 카메라로 파손 도로를 탐지하는 디바이스를 구상하였다. Port workers commuting by bicycle are threatened by damaged roads such as port halls created by large cargo. To solve this problem, a device was designed to detect broken roads with sensors and a camera.
선박 및 해양 구조물 곡부재 치수 품질 관리를 위한 가공완성도 평가
권기연(Ki-Youn Kwon),이재용(Jaeyong Lee) 한국해양공학회 2018 韓國海洋工學會誌 Vol.32 No.2
The forward and afterward parts of ships and offshore structures are designed to improve the fuel consumption performance. These are made of curved plates with a large thickness. If a fabricated curved plate has some dimensional errors, a lot of additional cost is incurred in the assembly process. Thus, an accurate dimensional assessment is very important for fabrication. In this paper, we propose an assessment method for the dimensional quality management of curved plates. This can be applied to data measured using a variety of three-dimensional instruments, with boundary measurement points automatically classified and sorted to create a measurement surface. The assessment is evaluated after matching the CAD surface and the measured surface considering constrained conditions. The fabrication assessment is evaluated as a probability of how much the tolerance is satisfied.