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Feature shape complexity: a new criterion for the simplification of feature-based 3D CAD models
Kwon, Soonjo,Mun, Duhwan,Kim, Byung Chul,Han, Soonhung Springer-Verlag 2017 INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TE Vol.88 No.5
<P>Three-dimensional computer-aided design (3D CAD) models with different levels of detail (LOD) are used in various industries for numerous purposes. Therefore, it is necessary to develop techniques to simplify 3D CAD models in order to adjust the LOD of the model according to its purpose. The main purpose of simplification is to minimize the change in the outer shape of the models and to reduce the data size of the models. The key technologies to achieve these purposes are evaluation metrics and simplification operation. Evaluation metrics are employed to select elements to be preserved or removed by calculating the importance of the geometric elements comprising a 3D CAD model. The simplification operation removes the selected elements and fills up the void in the model caused by the removal. Feature volume and type have been the most popular criteria used in evaluation metrics for the simplification of feature-based 3D CAD models. In this study, the concept of feature shape complexity (FSC) is introduced, and a method of adopting FSC as a criterion of evaluation metrics is presented. A prototype system for the simplification of 3D CAD models is then implemented. Finally, the effectiveness of the proposed method is verified by conducting simplification experiments with a complex 3D CAD assembly model.</P>
Soonjo Kwon,Soonhung Han,Duhwan Mun (사)한국CDE학회 2013 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
In ship outfitting and offshore plant design phase, the construction of an equipment catalog is necessary. Equipment 3D CAD data adopt different level of detail (LOD) depending on its purpose. Equipment supplier’s CAD data have high complexity whereas shipyard’s CAD data have low complexity. Therefore, an automation tool supporting the simplification of equipment 3D CAD data is necessary. In this paper, the simplification criteria and quantitative metric for 3D CAD assembly data are proposed. The prototype system was developed, and verified through experiment with test cases.
User-assisted integrated method for controlling level of detail of large-scale B-rep assembly models
Kwon, Soonjo,Kim, Byung Chul,Mun, Duhwan,Han, Soonhung Taylor & Francis 2018 International journal of computer integrated manuf Vol.31 No.9
<P>In recent times, there is a growing demand for technologies that control the level of detail (LOD) of large-scale three-dimensional (3D) computer-aided design (CAD) models. In particular, in industrial plants and in the construction industry, there is a significant need for simplification of large-scale models, because the number of models to be dealt with is tremendously large and their complexity is high. The degree of automation is, however, very low in these industries. As a result, many additional costs arise in the process of manually regenerating the 3D CAD models by the users. To resolve this problem, this study suggests a way to control effectively the LOD of large-scale B-rep assembly models. The proposed method consists of filtering, to remove those parts that ought to be removed, and progressive control, to remove sequentially the features acquired by volume decomposition. The user intervenes in the progressive control stage and adjusts the LOD for each component of the assembly. Based on the proposed method, a prototype system was implemented and experiments were performed for two test cases. The data size of the two test cases decreased, in average, to 65% in the first stage and 85% in the second stage. It was also found that the proposed component-level LOD control method is suitable and practical for a large-scale model.</P>
Kwon, Soonjo,Kim, Byung Chul,Hwang, Hojin,Mun, Duhwan,Han, Soonhung SAGE Publications 2016 Concurrent Engineering Vol.24 No.3
<P>Process plants are designed and constructed by engineering, procurement, and construction companies, which order various types of equipment to be installed in them. Equipment manufacturers design and produce the ordered equipment, and deliver it to the customer. Therefore, equipment information sharing between them is an important issue for engineering collaboration in a plant project. However, they use different three-dimensional computer-aided design systems for different purposes. For this reason, additional three-dimensional computer-aided design and data merging techniques are required for equipment information sharing. This article presents a new approach to share equipment information using three-dimensional computer-aided design simplification and digital catalog techniques. In this approach, the equipment's three-dimensional computer-aided design data generated by a manufacturer are first simplified and then converted into neutral three-dimensional computer-aided design. The converted three-dimensional computer-aided design data are merged with port and specification data into a digital catalog. Equipment information in the form of this digital catalog is finally delivered to the engineering, procurement, and construction companies.</P>
Kwon, Soonjo,Kim, Bongcheol,An, Kyungik,Ryu, Dongsoo,Mun, Duhwan,Han, Soonhung Elsevier 2018 Annals of nuclear energy Vol.118 No.-
<P><B>Abstract</B></P> <P>In a nuclear power plant, classification is a key tool to manage equipment and materials. There could be different classifications corresponding to the different lifecycle phases and the challenge is to achieve and maintain interoperability, continuity, traceability between them. Therefore, it is important to define the equipment and materials classification based on standardized information models in order to effectively share and integrate lifecycle data of equipment and materials. To accomplish this, a method for standardized exchange of plant equipment and materials data based on ISO 15926 methodology in nuclear power plants is suggested. In the proposed method, we use an information model to expand the equipment and materials classification used for the operation and maintenance phase of a nuclear power plant. This is based on the ISO 15926 standard after analyzing the master data from the Shin Kori unit 1 and 2 of Korea Hydro & Nuclear Power Co., Ltd. (KHNP). Furthermore, as a data exchange tool in the proposed method, this study develops a method to exchange equipment and materials specification data by using iRINGTools.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This study extends the equipment classification of a nuclear power plant based on the ISO 15926 standard. </LI> <LI> This is followed by constructing a user-defined reference data server for the extended classification. </LI> <LI> A method to exchange equipment specification data by using iRINGTools is also proposed. </LI> <LI> The reference data server and iRINGTools are used to exchange equipment specification data of the nuclear power plant. </LI> </UL> </P>