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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Computational Design and Engineering
Journal Basic Information
Journal DOI :
Society of CAD/CAM Engineers
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Volume & Issues
Volume 19, Issue 4 - Dec 2014
Volume 19, Issue 3 - Sep 2014
Volume 19, Issue 2 - Jun 2014
Volume 19, Issue 1 - Mar 2014
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Simplified Model for the Weight Estimation of Floating Offshore Structure Using the Genetic Programming Method
Um, Tae-Sub ; Roh, Myung-Il ; Shin, Hyun-Kyung ; Ha, Sol ;
Korean Journal of Computational Design and Engineering, volume 19, issue 1, 2014, Pages 1~11
DOI : 10.7315/CADCAM.2014.001
In the initial design stage, the technology for estimating and managing the weight of a floating offshore structure, such as a FPSO (Floating, Production, Storage, and Off-loading unit) and an offshore wind turbine, has a close relationship with the basic performance and the price of the structure. In this study, using the genetic programming (GP), being used a lot in the approximate estimating model and etc., the weight estimation model of the floating offshore structure was studied. For this purpose, various data for estimating the weight of the floating offshore structure were collected through the literature survey, and then the genetic programming method for developing the weight estimation model was studied and implemented. Finally, to examine the applicability of the developed model, it was applied to examples of the weight estimation of a FPSO topsides and an offshore wind turbine. As a result, it was shown that the developed model can be applied the weight estimation process of the floating offshore structure at the early design stage.
Simulation of Surface Coverage Made by Impeller Type Shot-peening Machines
Shin, Ki-Hoon ;
Korean Journal of Computational Design and Engineering, volume 19, issue 1, 2014, Pages 12~18
DOI : 10.7315/CADCAM.2014.012
Shot-peening is frequently used on various mechanical parts because it can improve the fatigue life of components by generating compressive residual stresses on the surface. This can be done by repeatedly hitting the work-piece surface with small balls and making indentations on it. In fact, finding optimal peening time among various peening parameters is the most important. Under-peening can not improve the fatigue life sufficiently while over-peening causes cracks and reduces fatigue life in contrast. In general, optimal peening time is experimentally determined by measuring arc-height using Almen-strip in accordance with SAE J442 standard. To save the time and efforts spent in carrying out experiments to find optimal peening time, this paper presents a computer simulation algorithm for the estimation of surface coverage made by impeller type shot-peening machines (PMI-0608). Surface coverage is defined as the proportion of the work-piece surface that has been indented in a given time of shot-peening. An example (standard tensile test specimen) is presented to validate the proposed method.
Filament Band Winding Simulation for Fiber Reinforced Cylindrical Pressure Vessels
Yun, Jaedeuk ; Fu, Jianhui ; Jung, Yoongho ;
Korean Journal of Computational Design and Engineering, volume 19, issue 1, 2014, Pages 19~28
DOI : 10.7315/CADCAM.2014.019
The filament winding method is widely used to manufacture products of fiber reinforced plastics (FRP), such as high pressure vessels, launch tubes and pipes. For reducing winding time, the method of winding by filament band which consists of several filament fibers is used. NC winding machine is used for precise winding and NC path is needed. Before filament winding, users should verify that winding path which presented by a line is appropriate by filament winding simulation. Also, the used length of each filament is different. So, if the peak filament exhausted, it causes to stop manufacturing. In this research, we developed software which visualizes 3D graphic of filament band winding path and simulates winding process on real time. And we proposed algorithm about calculation of each filament usage. We use geodesic equation for generating filament band surface and calculating the usage length of each filament.
Ontology-based Conceptual Model Building Framework for Discrete Event Simulation
Park, Jisung ; Jeong, Sunghwan ; Sohn, Mye ;
Korean Journal of Computational Design and Engineering, volume 19, issue 1, 2014, Pages 29~40
DOI : 10.7315/CADCAM.2014.029
Conceptual Modeling is the process of abstracting a model from a real or proposed system. It is probably the most important aspect of a simulation study. Relate works show that the elementary developers devoted little time to understanding how the systems actually worked, namely they didn't build appropriate conceptual model. Thus, the result of simulation is inconsistent because it depends on developer's competence. Although many researchers suggested various techniques enabling developer to build conceptual model, there were several limitations. In this study, to overcome the limitations of existing techniques, we proposed COMBINE-DES (COnceptual Model BuildINg framEwork using ontology for Discrete Event Simulation). The COM-BINE-DES supports expediting the conceptual modeling with Solution ontology generated by Domain ontology and Simulation ontology. Moreover, it provides consistent simulation result regardless of repeated modeling.
AVEVA Marine Scheme-based Modeling for Reuse of Ship Hull Block Model
Son, Myeong-Jo ; Kang, Hyungwoo ; Kim, Tae-Wan ;
Korean Journal of Computational Design and Engineering, volume 19, issue 1, 2014, Pages 41~49
DOI : 10.7315/CADCAM.2014.041
For the reuse of the existing 3D block model of a ship, we analyze the hull modeling process using AVEVA Marine which is a representative CAD (Computer-Aided Design) system for the shipbuilding. In the AVEVA Marine environment where the design engineer makes 3D model on the 2D view that is so-called 2.5D, it cannot be possible to copy to reuse the block model just simply copying the 3D feature model itself like in the general mechanical CAD system or Smart Marine 3D which are on the basis of the 3D model representation. In this paper, we analyze the scheme file where the 3D model is defined in AVEVA Marine so that we develop the program for the block copy and the translation using this scheme file. It is significant that this program can be immediately available as a real-world application on the AVEVA Marine environment.
Non-overlapping Volume Decomposition Using Maximum Volumes
Kim, Byung Chul ; Mun, Duhwan ;
Korean Journal of Computational Design and Engineering, volume 19, issue 1, 2014, Pages 50~60
DOI : 10.7315/CADCAM.2014.050
In this paper, we propose a non-overlapping volume decomposition method that decomposes a solid model into non-overlapped volumes. The non-overlapping volume decomposition finds non-overlapped volumes from maximum volumes. After introducing the concept of the non-overlapping volume decomposition, we discuss technical issues and solutions for them. The non-overlapping volume decomposition is verified by the experiments with a prototype system. From the experiments, it was found that the non-overlapping volume decomposition shows better result than maximum volume decomposition from the view point of design feature recognition.
Efficient View-dependent Refinement of a Height Map
Chung, Yong Ho ; Hwam, Won K. ; Park, Sang Chul ;
Korean Journal of Computational Design and Engineering, volume 19, issue 1, 2014, Pages 61~67
DOI : 10.7315/CADCAM.2014.061
This paper proposes a procedure enabling the extraction of view-dependent triangular approximations from a height map. In general, procedures to approximate a height map use tree hierarchies. These methods, however, have a limitation in terms of accuracy, because they depend on tree hierarchy than terrain features. To overcome the difficult, we apply the simplification method for triangular meshes to a height map. The proposed procedure maintains full decimation procedure to support multiresolution. The maintenance of decimation procedure results in creation of the groups (trees), each of which consists of vertices that can be merged into one vertex (root node). As the groups have tolerance which is determined by some tests, they support the generation of view-dependent arbitrary triangular meshes.
Depth Camera-Based Posture Discrimination and Motion Interpolation for Real-Time Human Simulation
Lee, Jinwon ; Han, Jeongho ; Yang, Jeongsam ;
Korean Journal of Computational Design and Engineering, volume 19, issue 1, 2014, Pages 68~79
DOI : 10.7315/CADCAM.2014.068
Human model simulation has been widely used in various industrial areas such as ergonomic design, product evaluation and characteristic analysis of work-related musculoskeletal disorders. However, the process of building digital human models and capturing their behaviors requires many costly and time-consuming fabrication iterations. To overcome the limitations of this expensive and time-consuming process, many studies have recently presented a markerless motion capture approach that reconstructs the time-varying skeletal motions from optical devices. However, the drawback of the markerless motion capture approach is that the phenomenon of occlusion of motion data occurs in real-time human simulation. In this study, we propose a systematic method of discriminating missing or inaccurate motion data due to motion occlusion and interpolating a sequence of motion frames captured by a markerless depth camera.
Development of BIM Library for Civil Structures based on Standardized Drawings-Focused on 2D Standard Drawings of The MOLIT
Moon, HyounSeok ; Ju, KiBum ;
Korean Journal of Computational Design and Engineering, volume 19, issue 1, 2014, Pages 80~90
DOI : 10.7315/CADCAM.2014.080
In architecture projects, BIM library has widely been using for prefabrication of products and design process. However, since the shape of structures is different by each project in civil engineering projects and a shape representation system is complicated, it is not easy to develop a standardized BIM library. To solve these issues, this study develops BIM library based on standardized 2D shop drawings for civil structures. The standardized shop drawings, which are the targets of the BIM library model, should be first selected. Besides, in order to define modeling scope with the level of general and shop drawings for each structure, LOD(Level of Detail) and breakdown structure are determined, and development methods of families of 3D object type including 2D profile and rebar through commercial software are established. With these, properties of BIM library are configured, and a utilization model of the BIM libraries is constructed for 3D modeling and a simulation using the BIM library. Therefore, this study can identify properties that are necessary when IFC schema is configured for civil engineering projects. For future, it is expected that easiness of BIM design for the civil engineering projects and generation, management, and analysis system of BIM library for road projects will be secured.