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박개명(Kaemyoung Park),이정렬(Jeong-youl Lee),이경호(Kyungho Lee) (사)한국CDE학회 2015 한국CDE학회 논문집 Vol.20 No.3
The specific goal of the SMS (Ship Management System) is to increate ship safety and decrease maintenance fee. Equipment of ship is managed by PMS (Planned Management System), subsystem of SMS. But hull has not managed by ship manager. So, the Classes have developed the system for hull maintenance. Recently, the ship maintenance system has been developed for satisfying operator’s requirements such as managing maintenance data as integrated platform, intuitive manipulation and design for ease of use. To reflect such requirement, 3D Model based maintenance system was introduced for ship in operation stage. Hull items that have to be inspected, repaired, replaced, are stored in integrated data platform with drawing, reports, and etc. and completely linked to 3D product Model. This system is specially developed for measurement and maintenance of hull thickness
조선 기본구조설계 단계에서의 3D CAD/CAE 인터페이스 개발
손명조(Myeong-Jo Son),이정렬(Jeong-Youl Lee),박호균(Ho Gyun Park),김종오(Jong-Oh Kim),우정재(Jengjae Woo),이정현(JoungHyun Lee) (사)한국CDE학회 2016 한국CDE학회 논문집 Vol.21 No.2
The finite element modeling of a ship for hull structural analysis on the basis of new harmonized common structural rules (CSR-H) is to be extended to the cargo holds in fore and after body of a ship. Unlike the parallel middle-body where the external and internal features of hull are equal along to the longitudinal direction of a ship, in fore and after body, the external and internal features of hull vary linearly or even irregularly in forms of a surface or a curve along to the longitudinal direction of a ship. Thus, it needs lots of design man-hours for the modeling for structural analysis. In order to save man-hours in initial structural design phase of a ship, the specified 3D CAD system has been adopted in shipbuilding industry. Through the interface between CAD and CAE (rule scantling and direct strength assessment), design man-hour in initial design phase can be saved even under the environment of CSR-H.
Eun-seop Yu(유은섭),Hyunoh Lee(이현오),Soonjo Kwon(권순조),Jeong-youl Lee(이정렬),Duhwan Mun(문두환) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.7
Three-dimensional (3D) computer-aided design (CAD) models require different levels of detail (LODs) depending on their purpose. Therefore, it is beneficial to automatically simplify 3D CAD assembly models to meet the desired LOD. Feature-based 3D CAD assembly models typically have the lowest and highest feasible limits of LOD during simplification. In order to help users obtain a feasible simplification result, we propose a method to simplify feature-based 3D CAD assembly models by determining the lowest and highest limits of LOD. The proposed method is verified through experiments using a simplification prototype implemented as a plug-in type module on Siemens NX.
직접구조강도 평가를 위한 선체 국부구조 상세요소분할모델 자동생성
손명조(Myeong-Jo Son),우정재(Jeong-Jae Woo),박호균(Ho Gyun Park),이정렬(Jeong-Youl Lee) (사)한국CDE학회 2017 한국CDE학회 논문집 Vol.22 No.3
Under the circumstances of Common Structure Rules for Bulk Carrier and Oil Tanker (CSR-H; Harmonized Common Structure Rules) which is on effective from July 2015, the modeling area for finite element (FE) has been extended to forward and afterward cargo hold regions of a ship, more design man-hours are required in the FE modeling than that of previous rules. In addition, it is mandatorily required to generate the fine-mesh model for hot spot zones, but the target area has been extended so extensively, more design man-hours are required for fine-mesh modeling than that of coarse mesh modeling. Moreover, the local area for fatigue analysis should be modeled with very fine-mesh. However, these kinds of FE modeling for different level of detail and different purpose of analysis are time consuming and repetitive works. In this research, we would like to introduce the auto fine mesh modeling functionality that can generate fine-mesh and very-fine mesh model from the coarse mesh model, and retrieve and restore them to coarse mesh for certain purpose by re-mesh functionality. Through this process, FE model can be managed and reused with a consistent FE model from the initial design stage to detailed design stage of a ship.
3D Model 을 이용한 선체 두께 관리 시스템 개발
박개명(Kaemyoung Park),길우성(Woo-sung Kil),이정렬(Jeong-youl Lee),이경호(Kyungho Lee) (사)한국CDE학회 2015 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2015 No.동계
Recently, the ship maintenance system has been developed for satisfying operator’s requirements such as managing maintenance data as integrated platform, intuitive manipulation and design for ease of use. To reflect such requirement, 3D model based maintenance system was introduced for ship in operation stage. Hull items that have to be inspected, repaired, replaced, are stored in integrated data platform with drawing, reports, and etc. and completely linked to 3D product model. This system is specially developed for measurement and maintenance of hull thickness.
UG NX 기반 3D CAD 조립체 모델의 단순화 API의 개발
유은섭(Eun-seop Yu),이주호(Juho Lee),이정렬(Jeong-youl Lee),문두환(Duhwan Mun) (사)한국CDE학회 2017 한국CDE학회 논문집 Vol.22 No.3
A 3D CAD model has different level of detail (LOD) according to its purpose. Therefore, it is necessary to automatically simplify a 3D CAD model in order to meet the LOD desired by a user. Especially the simplification of 3D CAD assembly models is important because mechanical products are typically not a part but an assembly. Various common functions including extracting assembly model data, calculating importance of each model element, and deleting model elements are used in the simplification process. In this paper, we present a set of application programming interfaces (APIs) to provide the basic functions for use in the simplification. For the development of simplification APIs, we analyze functional requirements for the APIs, define a list of APIs according to the requirements, and design the APIs. Finally we implement the APIs using UG Open API and verify them through experiments.