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특징 형상 모델링에서의 DDG(Dimension Driven Geometry)를 위한 표현 구조에 관한 연구
오익수,변문현 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.2
Most of the geometric modeling system uses CSG or boundary representation scheme. But these representation schemes can only support limited topological and geometric information. In an automated CIM environment, the additional data such as dimension, tolerance, feature information must be prepared in the design stage. Feature-based design implies a more convenient design environment and can provide more useful data in the CAM application. Dimension-driven geometry mechanism provides a natural and efficient method for modifying geometry. This study presents a representation scheme for explicitly representing dimensions and form reatures in boundary representation solid models.
홍상훈,서효원,이상조 대한기계학회 1993 대한기계학회논문집 Vol.17 No.10
By virtue of progress of computer science, CAD/CAM technology has been developed greatly in each area. But the problems in the integration of CAD/CAM are not yet solved completely. The reason is that the exchange of data between CAD and CAM is difficult because the domains of design and manufacturing are different in nature. To solve this problem, a feature based modeller is developed in this study, which makes it possible to communicate between design and manufacturing through features. The modeller has feature, the concept of semi-bounded plane is introduced, and implemented as a B-rep sheet model using half-edge data structure. The features are then created on a part by local modification of the boundary on a part based on feature template information. This approach generalizes the modelling of features in a geometry model.
하향식 설계방식을 지원하는 새로운 개념의 CAD 시스템
김성환,이건우 대한기계학회 1995 대한기계학회논문집 Vol.19 No.7
In the process of mechanical assembly design, assembly modeling systems have been used mainly for the design verification before manufacturing by enabling to check the interference and/ or the dynamic and kinematic performance. However, the conventional assembly modeling systems have a shortcoming that they can not be used in the initial design stage but can be used only after the design is fully completed. In other words conventional assembly modeling systems provide bottom-up modeling which means that the detailed modeling of components must precede the definition of relationships between them. To resolve this problem, an assembly modeling system is proposed to provide a top-down modeling environment in which components and assembly can be modeled simultaneously. To this end, an assembly data structure suitable for top-down assembly modeling has been established. Feature positioning Module(FPM) using geometric constraints has been also developed. The Sekective Solving Method proposed for FPM is based on the priority between the constraint equations and enables the designer's intent expressed by geometric constraints to be maintained throughout the whole modeling process. Finally, the feature based modeling technique using two-level features has been developed. Two-level features include an abstract model and a detailed model in a merged form in non-manifold data frame.
박상근,Park, Sangkun 한국교통대학교 융복합기술연구소 2014 융ㆍ복합기술연구소 논문집 Vol.4 No.2
This paper examines feature-based reconstruction algorithm using feature-based modeling and based on topology optimization technology, which aims to achieve a minimal volume weight and to satisfy user-defined constraints such as stress, deformation related conditions. The finite element model after topology optimization allows us to remove some region of a solid model for predefined volume requirement. The stress or deformation distribution resulted from finite element analysis enables us to add some material to the solid model for a robust structure. For this purpose, we propose a feature-based redesign algorithm which inserts negative features to the solid model for material removal and positive features for material addition, and we introduce a bisection method which searches an optimal structure by iteratively applying the feature-based redesign algorithm. Several examples are considered to illustrate the proposed algorithms and to demonstrate the effectiveness of the present approach.