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RISS 인기검색어
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- 저자 : 채희창 (검색결과 87 건)
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채희창,명태식,김태규 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.3
It is difficult to make shape library for feature-based modeling because free-form surface is various shaped complicated. To make modeling using similar shape feature-based model is easy and fast. Recently, RE(Reverse Engineering) technolo-gy is very convenient method to get free-form surface. This study develops surface editor which makes surface modeling to manipulate control points, and this study We study on the effective model data management using database system.
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蔡熙昌,鄭寅聖 전북대학교 공업기술연구소 1987 工學硏究 Vol.18 No.-
A program for drawing of penetrating lines was developed in personal computer. PROLOG, a language of Artificial Intelligence, was used and a data structure using relational data base was designed. An algorithm for finding the penetrating lines in the real space was developed. The program can be applied at any types of penetrating problems like curve-surface, surface-surface, curve-object, surface-object, object-object, etc. In developing the program, the following results were obtained. 1. Relational data base built in PROLOG and the function of backtracking is helpful in computer graphics. 2. In spite of increasing the number of edges, assigning direction to the edges makes it possible to represent the polygon meshes as the non ordered sets of directional half edges. 3. Topologicaly the penetrating lines of a polygon can be represented as the edge-pairs in the edge list of the polygon.
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채희창,정인성 대한기계학회 1990 대한기계학회논문집 Vol.14 No.2
A data structure representing 3-D objects was designed for the personal computer. It is very simple to be used in the personal computers which have small memory and low speed. A homogeneous transformation for developing 3-D objects was derived. Each developing procedure consists of five transformations : one translational-three rotational-one translational. Developing a solid is a creative work. So the results of developing vary with the order of surfaces to be developed. One method to reduce the length of seam was considered. The programs used in this study were written in Pascal and Assembly and a modeller that generates 3-D primitives was included. This program is an interactive dual-screen system. While all the menus in Korean are displayed at the monochrome monitor, the development figures with projective views are drawn at the color monitor. The program has wide applications for plate works.
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蔡熙昌,鄭寅聖 全北大學校 1990 論文集 Vol.32 No.-
CAD of the conical springs under compressive load was studied in the personal computer. Unlike cylindrical spring, the behavior of conical coil spring is very complex and difficult to be calculated. Under the critical load, the spring has linear characteristics. When the load is above the critical value, the relation between load and deformation is no more linear. Even though the stress of spring material is below the proportional limit, non-linear phenomena appears due to the reduction of deformable portion of the spring. Design equations of the conical spring and design constraints were searched. Non-linear least square method was used to get the design parameters for the given design conditions. This method is more stable and useful than Newton method in the field of mechanical design.
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채희창,김동우 한국공작기계학회 1997 한국생산제조학회지 Vol.6 No.1
The verification of the STL file is essential to build the confident parts using a RP machine, because the STL file obtained from the CAD software has many errors - the orientation of triangle does not coincide with adjacent triangles or some triangles are omitted, overlpped and so forth. Especially, the STL file translated from the surface model has more errors than those translated from the solid model. In this study, all possible errors were classified with the most general form and the causes of errors were analyzed to verify and correct errors. Using the triangle based non-manifold geometric modeling, these errors were corrected. Especially, this study took the notice of the problem about the intersected triangles and non-manifold properties overlooked in the previous studies. But this study has a penalty on computing time of O(n^2)
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고속적층조형법에서 성형 정밀도와 Support Sturcture를 고려한 최적 적층방향의 결정
채희창 全北大學校 1996 論文集 Vol.42 No.-
Rapid Prototyping(RP) is the technique which is used to make prototypes or functional parts directly using the 3-D solid data. Before building the prototype, several processes such as transfering 3D data from CAD system(STL), determination of build-direction, adding support sutructure and slicing are required. Among the above processes, determination of build-direction is the target of this study. The build-direction is determined by many factors according to the objective of the user, like part accuracy, number of support structure, build time, amount of trapped volume, etc. But it is not easy to determine the build-direction because there are many factors and some factors have dependent properties with one another. So, in this study the part accuracy and the number of support structures are considered as the main factor to determine the optimal build-direction. To determine the optimal build-direction for increasing part accuracy, sum of projected area which caused stairstepping effect was considered. The less the projected area is the better part accuracy os. About the optimal build-direction to minimize the amount of support structure, similar projected area of facets that require support structures was considered. Finally total object function for both of part accuracy and the amount of support structures was derived. It is composed of two non-dimensional object functions and two weighting factors. First function is the ratio of projected area and total facet area. The second function is the ratio of projected area of facets that require support structures and total facet area.
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蔡熙昌,鄭寅聖 전북대학교 공업기술연구소 1987 工學硏究 Vol.18 No.-
A small CAD program was developed in personal computer. This program was written by PROLOG, a language of Artificial Intelligence. Polyhedron model was used in the program. Complex 3-D objects were obtained through assembling the primitive objects. An assembling algorithm to preserve topological consistency of the assembled objects was developed. The program has the following characteristics. (1) Interactive 3-D computer graphics system (2) Generations of 3-d primitive objects (3) Editing the objects through assembling, deleting, and cutting (4) Translational or rotational transformation of objects (5) Arbitrary eye point and parallel or central projection (6) hidden lines are removed or drawn as drawn as broken lines (7) Saving the graphic data into files
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