• 대한기계학회논문집
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• 제19권7호
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• pp.1604-1618
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• 1995

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.

• 대한기계학회논문집
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• 제13권1호
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• pp.48-58
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• 1989

이 논문의 목적은 사용자가 부품간의 연결정보로는 단지 만남조건 (mating condition)만을 입력함으로써 조립체가 생성이 되고 또 그로부터 동역학 또는 기구학적 해석 프그램과의 연결을 위한 정보가 유도되는 조립체 모델링 시스템(assembly modeling system)을 개발하는 것이다. 만남조건을 통해 조립체를 생성하는 방법은 이미 Rocheleau와 Lee에 의해 개발되었으나 그들은 주로 각 부품의 위치를 찾아내는 데에만 관심을 두었고 본 논문에서는 그것의 확장으로 해석 프로그램과 연결시키는데 필요한 정보의 유도를 추가로 고려하였다.

• 한국정밀공학회지
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• 제10권4호
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• pp.30-41
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• 1993

Developed in this paper is a feature based modeling system for the design of welded plat construction(WPC) which is composed of flat or bended plates represented as reference plane with a constant thickness. First, the necessity and the characteristics of the modeing system for WPC as compared with the assembly of mechanical parts are investigated. Secondly, feature library for the assembly of WPC is shown which contains several types of features like joint feature, groove feature, material feature, and precision feature. Thirdly, the assembly procedures are presented which mainly consist of both the assembly transformation and the correct assembly checking. Fourthly, weld lines of the assembled WPC are defined so that those can be used in the process planning or the manufacturing stage. Finally, a prototype by a geometric modeling software Pro/Engineer, a graphic software GL(Graphic Library), and C language on a CAD workstation IRIS.

• 한국CDE학회논문집
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• 제2권2호
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• pp.93-102
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• 1997

Most design changes are due to interferences and fit-up as parts are assembled if such a large product as an automobile or an aircraft is developed by many concurrent engineers. In this part (1) of the thesis, the assembly-centric modeling methodology with CAD systems is proposed in order to reduce the design changes. Unlike part-centric modeling method, a part is modeled with its own coordinate system which is used in downstream process as machining and measuring. The part coordinates initially have the same orientation as its assembly which is predefined in BOM (Bill of Material). Then, the corrdinates origin of the part is moved to its location to be assembled from that of its assembly coordinate system. To implement this methodology, the position data of the part w.r.t. its assembly are stored in a database to build the same hierarchical assembling structure as BOM structure. This modeling approach has the advantage of reflecting asembling sequence, because the process of positioning parts is similar to that of real assembling. And with the method, a designer can easily adjust all of the part positions of an assembly to resolve interferences if he modifies just the coordinates origin of the assembly, which results in moving included parts and assemblies together.

• 정보처리학회논문지B
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• 제13B권2호
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• pp.139-148
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• 2006

협업적 제품 설계 환경에서는 여러 설계자가 작업에 참여하기 때문에 설계자간의 원활한 의사 소통이 필수적인 요소이다. 즉, 제품 설계에 내재되어 있는 다른 설계자의 설계의도를 파악할 수 있어야 하고, 각 설계자마다 사용하고 있는 상이한 모델링 용어에 대한 의미적 처리가 필요하다. 시맨틱 웹에서 온톨로지는 의미 정보를 명시적으로 표현할 수 있기 때문에 데이터와 서비스에 대한 통합되고 일관된 접근을 가능하게 한다. 따라서 제품을 여러 설계자가 설계하는 협업적 환경에서 온톨로지를 사용한다면 조립체내의 내포된 공학적 관계들, 공간적 관계들, 그리고 접합 관계들이 명확하게 표현되고, 추론을 통해 설계자의 의도가 파악되어 설계자간의 의사소통이 원활하게 이루어질 수 있다. 본 논문에서 는 조립체를 온톨로지를 이용하여 표현함으로써 협업적 환경에서 조립체 설계정보를 공유할 수 있는 시맨틱 조립체 모델링 프레임워크를 제안한다. 시맨틱 조립체 모델링 프레임워크에서는 조립체 관계 모델(Assembly Relationship Model, ARM)을 OWL(Web Ontology Language)와 SWRL(Semantic Web Rule Language)로 표현한다. 이를 통해 조립체 내에 내포된 공학적 관계들, 공간적 관계들, 그리고 접합 관계들이 명확하게 표현되고, 추론되어 설계 의도가 파악된다.

• 대한토목학회논문집
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• 제33권1호
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• pp.35-46
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• 2013

본 연구에서는 모듈러 강교량 상부모듈 구성파트의 효율적인 3차원 조립설계를 위하여 BIM(Building Information Modeling)의 핵심기술 요소인 파라메트릭 모델링 방법을 연구하였다. 모듈러 강교량 상부모듈 구성파트의 3차원 조립설계를 위하여 모듈의 조립체계를 상세수준(LoD: Level of Details) 3단계로 정의하였다. 모듈을 구성하는 각 파트들의 3차원 형상구성을 위한 요소들을 추출하여 매개변수, 매개변수에 따라 변하는 종속변수, 매개변수에 따라 변하지 않는 고정 값으로 구분하여 정의하였으며, 조립체계 단계에 따라 파트간의 공간적 조립규칙을 정의하였다. 공간적 위치를 구속하기 위하여 3차원 형상구성 요소간의 위치관계를 정의하였으며, X, Y, Z 축에 대한 자유도를 구속하기 위하여 기하학적 관계를 정의하였다. 또한, 정의한 조립규칙을 적용하여 모듈러 강교량 상부모듈의 3차원 조립설계를 위한 표준템플릿을 구축하였으며, 정의한 매개변수의 변화에 따른 강교량 상부모듈의 형상변화 검토를 통하여 파라메트릭 모델링 방법의 적용성을 검증하였다.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2002년도 춘계공동학술대회
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• pp.272-279
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• 2002

A common task in assembly modeling is the determination of the position and orientation of a set of components by solving the spatial relationships between them. Assembly models could be constructed at various levels of abstraction. They could be classified into component or geometry-level assembly models. The geometry-level assembly design approach using mating constraints such as against and fits is widely used in the commercial modelers, but it may be very tedious in some cases fur designer. In this paper, we propose a new method to construct an assembly model at the component-level by extracting joint mating features from the kinematics constraints specified between components. The assembly model constructed using the proposed method includes hierarchical and relational assembly models, component/sub-assembly positions and degrees of freedom information. The proposed method is more intuitive and natural way of assembly design and it guarantees the topological robustness of assembly modification such as component replacement and modification.

• International Journal of Computer Science & Network Security
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• 제23권5호
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• pp.21-32
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• 2023

The design of complex man-made systems mostly involves a conceptual modeling phase; therefore, it is important to ensure an appropriate analysis method for these models. A key concept for such analysis is the development of a diagramming technique (e.g., UML) because diagrams can describe entities and processes and emphasize important aspects of the systems being described. The analysis also includes an examination of ontological concepts such as states and events, which are used as a basis for the modeling process. Studying fundamental concepts allows us to understand more deeply the relationship between these concepts and modeling frameworks. In this paper, we critically analyze the classic definition of a state utilizing the Thinging machine (TM) model. States in state machine diagrams are considered the appropriate basis for modeling system behavioral aspects. Despite its wide application in hardware design, the integration of a state machine model into a software system's modeling requirements increased the difficulty of graphical representation (e.g., integration between structural and behavioral diagrams). To understand such a problem, in this paper, we project (create an equivalent representation of) states in TM machines. As a case study, we re-modeled a state machine of an assembly line system in a TM. Additionally, we added possible triggers (transitions) of the given states to the TM representation. The outcome is a complicated picture of assembly line behavior. Therefore, as an alternative solution, we re-modeled the assembly line based solely on the TM. This new model presents a clear contrast between state-based modeling of assembly line behavior and the TM approach. The TM modeling seems more systematic than its counterpart, the state machine, and its notions are well defined. In a TM, states are just compound events. A model of a more complex system than the one in the assembly line has strengthened such a conclusion.

• 한국생산제조학회지
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• 제19권1호
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• pp.89-93
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• 2010

This paper describes the analysis of state when load applies to McPherson strut assembly. Strut assembly except knuckle-arm are created with 3 dimensional modeling program. Stress and structural strength on this model are analyzed by analysis program as load applies on the lower part of assembly modeling. When McPherson suspension is applied with 3000N at Z direction, maximum stress at spring becomes 433MPa and the cycle of minimum life is 4321. The designed modeling suspension at this study has no possibility with resonance.

• 산업공학
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• 제18권1호
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• pp.94-103
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• 2005

Digital Manufacturing is a technology to facilitate effective product developments and agile productions by digital environments representing the physical and logical schema and the behavior of real manufacturing system including manufacturing resources, processes and products. A digital factory as a well-designed and integrated environment is essential for successful applications of this technology. In this research, we constructed a sophisticated digital factory of an automotive company’ general assembly shop by measuring and 3-D CAD modeling using parametric methods. Specific parameters of each objects were decided by object-oriented schema of the general assembly shop. It is expected that this method is very useful for constructions of a digital factory, and helps to manage diverse information and re-use 3D models.