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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Computational Design and Engineering
Journal Basic Information
Journal DOI :
Society of CAD/CAM Engineers
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Volume & Issues
Volume 10, Issue 6 - Dec 2005
Volume 10, Issue 5 - Sep 2005
Volume 10, Issue 4 - Aug 2005
Volume 10, Issue 3 - Jun 2005
Volume 10, Issue 2 - Apr 2005
Volume 10, Issue 1 - Feb 2005
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Development of Injection Mold Design System for Pseudo-Solid Part Models
Lee S.H. ; Lim S.L. ; Lee K.S. ;
Korean Journal of Computational Design and Engineering, volume 10, issue 3, 2005, Pages 151~161
This paper describes the parting and Boolean operations for a pseudo-solid model of a plastic part, and their application to injection mold design. Here, a pseudo-solid model means a sheet model that looks like a solid model, but its boundary is not closed. When a solid model created in a different CAD system is imported through a standard data exchange file format, in most cases, a pseudo-solid model may be created due to tolerance or some other problems. However, most existing mold design systems based on solid modeling kernels require a complete part solid model. Therefore, mold designers have to do time-consuming healing operations to convert a pseudo-solid to solid. To eliminate or reduce the healing pre-process for mold design, in this paper, we proposed the parting and Boolean Operations on pseudo-solid part models. This paper also describes their detailed implementation and a case study.
CAE Solid Element Mesh Generation from 3D Laser Scanned Surface Point Coordinates
Jarng S.S. ; Yang H.J. ; Lee J.H. ;
Korean Journal of Computational Design and Engineering, volume 10, issue 3, 2005, Pages 162~167
A 3D solid element mesh generation algorithm was newly developed. 3D surface points of global rectangular coordinates were supplied by a 3D laser scanner. The algorithm is strait forward and simple but it generates hexahedral solid elements. Then, the surface rectangular elements were generated from the solid elements. The key of the algorithm is elimination of unnecessary elements and 3D boundary surface fitting using given 3D surface point data.
Development of Delaunay Triangulation Algorithm Using Oct-subdivision in Three Dimensions
Park S.H. ; Lee S.S. ;
Korean Journal of Computational Design and Engineering, volume 10, issue 3, 2005, Pages 168~178
The Delaunay triangular net is primarily characterized by a balance of the whole by improving divided triangular patches into a regular triangle, which closely resembles an equiangular triangle. A triangular net occurring in certain, point-clustered, data is unique and can always create the same triangular net. Due to such unique characteristics, Delaunay triangulation is used in various fields., such as shape reconstruction, solid modeling and volume rendering. There are many algorithms available for Delaunay triangulation but, efficient sequential algorithms are rare. When these grids involve a set of points whose distribution are not well proportioned, the execution speed becomes slower than in a well-proportioned grid. In order to make up for this weakness, the ids are divided into sub-grids when the sets are integrated inside the grid. A method for finding a mate in an incremental construction algorithm is to first search the area with a higher possibility of forming a regular triangular net, while the existing method is to find a set of points inside the grid that includes the circumscribed sphere, increasing the radius of the circumscribed sphere to a certain extent. Therefore, due to its more efficient searching performance, it takes a shorer time to form a triangular net than general incremental algorithms.
Development of an Extension Model based on Three Dimensional Wireframe Model for KOSDIC Format in the Construction Field
Kim I.H. ; Seo J.C. ; Won J.S. ;
Korean Journal of Computational Design and Engineering, volume 10, issue 3, 2005, Pages 179~187
The usage of mixed 2D and 3D CAD data of commercial CAD systems is required in the construction practice. Sometimes 3D wireframe model is required by end-users when 2D CAD data is delivered. However, current KOSDIC can not represent 3D CAD data, because it has been developed as a 2D drawing delivery standard. Therefore, this study is to provide exchange and sharing of mixed 2D and 3D CAD data that add 3D wireframe model in the KOSDIC. To achieve this purpose, the authors have investigated the 3D CAD entities of commercial CAD systems, and have analyzed STEP standards providing 3D wireframe model. The result, the authors have extracted 3D CAD common entities based wireframe model which shall be added in the KOSDIC. This study can be beneficial by using the developed data model for heterogeneous CAD systems, and by providing the representation of mixed 2D and 3D CAD data in construction practice such as GIS, piping system, and so forth.
An e-Catalog to Support e-Machining of ETO Mold Parts
Mun D.H. ; Cho J.M. ; Kim B.C. ; Jang K.S. ; Han S.H. ; Ryu B.W. ;
Korean Journal of Computational Design and Engineering, volume 10, issue 3, 2005, Pages 188~198
There are two types of mold parts, ready-made standard parts and ETO (Engineered-to-Order) parts, the latter are of increasing importance to manufacturers. However, the ETO parts require more engineering support and communication than the ready-made standard parts. Existing e-Catalog modules provide classification structures of products that allow customers to select products based on their needs, and the trade begins with the provided specification. However, machine parts or mold parts have different purchasing patterns. Customers do not purchase the ready-made standard parts offered by an e-Catalog. They usually (1) add own options to the provided specifications or (2) change specification items such as length. To support these trades, a new e-Catalog system is proposed. The proposed system is based on the product design process and the specification selection process in addition to the parts classification structure.
Digital Manufacturing Strategy & Case study of Automotive General Assembly
Choi M.W. ; Han S.T. ; Seo J.H. ; Woo J.H. ; Lee C.J. ; Choi Y.R. ;
Korean Journal of Computational Design and Engineering, volume 10, issue 3, 2005, Pages 199~209
In this paper, a digital simulation model for an automotive assembly line is constructed by adapting a digital manufacturing methodology. Applied methodology is a simulation for a plant level of the assembly production line. The first significance of this methodology is a validation of the production planning based on various scenarios. The second is pre-verification for the new production plan or production method. The third is a visualization of the production process. Several models were implemented and those models were verified. Then, it was possible to find a most efficient production scenario and production method.
Digital Manufacturing Based Productivity Evaluation According to the Change of Welding Robot Torches in Subassembly Lines of a Shipyard
Lee K.K. ; Kang H.J. ; Kim S.H. ; Park J.Y. ; Shin J.G. ;
Korean Journal of Computational Design and Engineering, volume 10, issue 3, 2005, Pages 210~216
Digital manufacturing could be very effective in shipbuilding in order to estimate the process time, to improve the operation efficiency, and to prevent bottleneck processes in advance. The subassembly process having done research consists of piece arrangement, tack welding, robot welding, manual welding and so on. The robot welding of them was the focus of the simulation. The analysis and modeling were carried out by using UML (Unified Modeling Language) as well as
(Integration DEFinition). The characteristics of the process resources were analyzed using the shipyard data, and the layout of the subassembly line was designed with the resources. Using the constructed resource and process model, the productivity and efficiency of changed robot welding stage were investigated. It was simulated how much the variations in the resource performance have influence on improvement of productivity. One of the important outputs in this simulation was the cycle time during a certain period's work. The cycle time prediction was also undertaken for the different torch and the different piece arrangement. The proposed model was established three-dimensionally in a digital environment so that interferences among objects and space allocations for the resources could be easily investigated.
Development of Initial Ship Design Analysis System Based on MRA
Han J.S. ; Kwon K.E. ; Choi Y. ;
Korean Journal of Computational Design and Engineering, volume 10, issue 3, 2005, Pages 217~223
Tight integration between design and analysis processes and the data representation in the ship design application domain have been studied in this paper. Multi-Representation Architecture for design and analysis integration, proposed at Georgia Institute of Technology, has been carefully investigated for the application in the initial ship design stage. The MRA approach facilitates efficient generation of analysis models from the initial ship design data, thus reducing design lead time. Easy generation of analysis model is important because it allows quick analysis iteration under frequent design changes. The SMM, ABB and PBAM are defined for the analysis model of the typical ship structure. Only a part of the typical initial ship design data has been considered in the experimental implementation of the proposed approach. However, the prototype implementation shows that the application of MRA approach in the structural ship design domain is quite feasible. It is also contemplated that the same approach can be extended for other design and analysis views in the ship design domain.