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채희창 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.1
Reverse engineering is an emerging technology to obtain CAD models from existing physical parts in the case that CAD models are not available or parts are changed and modified so that new CAD models for final parts are necessary. Reverse engineering helps designers to quickly generate compute interpretable data from existing physical objects. So it applying for field of Rapid Prototyping NC Processing CAE, Inspection and so on. The objective of this study is to develop the software that deals with unorganized point data and quickly obtains CAD model. In this paper, several models such as human's bone, car , are experimented by the proposed methods.
蔡熙昌,鄭寅聖 전북대학교 공업기술연구소 1987 工學硏究 Vol.18 No.-
A program to cut 3-D objects by arbitrary cutting plane and to draw the cutted objects was developed in personal computer. The programs were written by PROLOG that has relational database. Polyhedron model was used to describe 3-D objects and the cutting algorithm in this study preserves the topological consistency of the cutted objects. Plane parameters were reviewed or defined and sophiscated geometric calculations were easily performed by the plane parameters.
채희창 대한기계학회 1988 대한기계학회논문집 Vol.12 No.1
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 are 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,
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.
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.
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.