• Title/Summary/Keyword: Assembly Modeling

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Database and knowledge-base for supporting distributed intelligent product design

  • Nguyen Congdu;Ha Sungdo
    • Proceedings of the IEEK Conference
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    • summer
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    • pp.87-91
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    • 2004
  • This research presents distributed database and knowledge-base modeling approach for intelligent product design system. The product design information in this study is described by a collection of rules and design knowledge that are utilized according to the product development procedures. In this work, a network-based architecture has been developed to enable dispersed designers to simultaneously accomplish remote design tasks. A client/server communication diagram has also been proposed to facilitate consistent primary information modeling for multi-user access and reuse of designed results. An intelligent product design system has been studied with the concepts of distributed database and network-based architecture in order to support concurrent engineering design and automatic design part assembly. The system provides the capability of composing new designs from proper design elements stored in the database and knowledge-base. The distributed intelligent product design is applied to the design of an automobile part as an example.

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A Translator for Parametrized Building Component Interoperability among Open BIM Support Software (개방형 BIM 지원 소프트웨어간 파라메트릭 건축부재 정보의 호환성 향상을 위한 변환기)

  • Kim, In-Han;Lee, Ji-Ah;Park, Seung-Hwa
    • Korean Journal of Computational Design and Engineering
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    • v.15 no.6
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    • pp.467-475
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    • 2010
  • Due to the needs of design optimization and productivity for modernized Korean traditional house, standardization of Korean traditional building components is proceeding by BIM (Building Information Modeling). Currently, most of BIM software support object-based parametric modeling. By means of parameterized Korean traditional building components, the shape and assembly relation can be controlled. Although IFC(ISO/PAS 16739), which is an international standard in the AEC field, has been developed for information exchange among BIM software, IFC and other existing common data formats cannot be exchangeable parametric information. For the exchangeable parametric information within IFC, the authors defined meta-data by using Pset(Property-Set). The authors analyzed results about interoperability test in Revit $Architecture^{TM}$, $ArchiCAD^{TM}$ and Digital $Project^{TM}$. In order to solve found problems, the authors developed a translator to improve interoperability among BIM software.

Modeling of the lateral stiffness of masonry infilled steel moment-resisting frames

  • Lemonis, Minas E.;Asteris, Panagiotis G.;Zitouniatis, Dimitrios G.;Ntasis, Georgios D.
    • Structural Engineering and Mechanics
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    • v.70 no.4
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    • pp.421-429
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    • 2019
  • This paper presents an analytical model for the estimation of initial lateral stiffness of steel moment resisting frames with masonry infills. However, rather than focusing on the single bay-single storey substructure, the developed model attempts to estimate the global stiffness of multi-storey and multi-bay frames, using an assembly of equivalent springs and taking into account the shape of the lateral loading pattern. The contribution from each infilled frame panel is included as an individual spring, whose properties are determined on the basis of established diagonal strut macro-modeling approaches from the literature. The proposed model is evaluated parametrically against numerical results from frame analyses, with varying number of frame stories, infill openings, masonry thickness and modulus of elasticity. The performance of the model is evaluated and found quite satisfactory.

[ $PFC^{3D}$ ] Modeling of Stress Wave Propagation Using The Hopkinson's Effect ($PFC^{3D}$ 상에서의 홉킨슨 효과를 이용한 응력파의 전파모델링)

  • Choi Byung-Hee;Ryu Chang-ha
    • Explosives and Blasting
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    • v.23 no.3
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    • pp.27-42
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    • 2005
  • An explosion modeling technique was developed by using the spherical discrete element code, $PFC^{3D}$, which can be used to model the dynamic stress wave propagation phenomenon. The modeling technique is simply based on an idea that the explosion pressure should be applied to a $PFC^{3D}$ particle assembly not in the form of an external force (body force), but in the form of a contact force (surface force). The stress wave propagation modeling was conducted by simulating the experimental approach based on the Hopkinson's effect combined with the spatting phenomenon that had previously been developed to determine the dynamic tensile strength of Inada granite. As a result, the stress wave velocity obtained by the proposed modeling technique was 4167 m/s, which is merely $3\%$ lower than the actual wave velocity of 4300 m/s for an Inada granite.

Asp97 is a Crucial Residue Involved in the Ligation of the [$Fe_4S_4$] Cluster of IscA from Acidithiobacillus ferrooxidans

  • Jiang, Huidan;Zhang, Xiaojian;Ai, Chenbing;Liu, Yuandong;Liu, Jianshe;Qiu, Guanahou;Zeng, Jia
    • Journal of Microbiology and Biotechnology
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    • v.18 no.6
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    • pp.1070-1075
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    • 2008
  • IscA was proposed to be involved in the iron-sulfur cluster assembly encoded by the iscSUA operon, but the role of IscA in the iron-sulfur cluster assembly still remains controversial. In our previous study, the IscA from A. ferrooxidans was successfully expressed in Escherichia coli, and purified to be a [$Fe_4S_4$] -cluster-containing protein. Cys35, Cys99, and Cys101 were important residues in ligating with the [$Fe_4S_4$] cluster. In this study, Asp97 was found to be another ligand for the iron-sulfur cluster binding according to site-directed mutagenesis results. Molecular modeling for the IscA also showed that Asp97 was a strong ligand with the [$Fe_4S_4$] cluster, which was in good agreement with the experimental results. Thus, the [$Fe_4S_4$] cluster in IscA from A. ferrooxidans was ligated by three cysteine residues and one aspartic acid.

Dynamic Modeling of a Satellite with Solar Array Flexible Modes (태양전지판의 유연 모드를 고려한 위성의 동적 모델링)

  • Kim, Dae-Kwan;Park, Young-Woong;Park, Keun-Joo;Yang, Koon-Ho;Yong, Ki-Lyuk
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.37 no.9
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    • pp.837-842
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    • 2009
  • The efficient dynamic modeling of a satellite with flexible solar arrays is established by using the component mode synthesis technique. A flexible satellite model can be defined as the assembly of two sub-structures, central body and solar array. The reduced models of each substructure, which are expressed in each local frame, are coupled with respect to the satellite reference frame. The dynamic modeling method is applied to the numerical example of a satellite with a single solar array, and is verified by investigating the transfer function results with considering the solar array rotation.

Development of BIM Based Information Model Interface Module for a Modular Pier (모듈러 교각의 BIM 기반 정보 모델 인터페이스 모듈 개발)

  • Kim, Dong-Wook;Lee, Kwang-Myong;Nam, Sang-Hyeok
    • Journal of KIBIM
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    • v.5 no.1
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    • pp.1-7
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    • 2015
  • Modular technology has become a major issue of the construction industries to enhance their productivity. Modular bridge construction generally requires the data exchange between the contractors, designers, fabricators and constructors. Therefore, a readily accessible information model interface module based on BIM technology is essential for their communication during a project life-cycle. In this study, BIM based information model interface module for a modular pier was developed. For the information models, the PBS(Product Breakdown Structure) and LOD(Level of Development) were defined. Next, all components of a modular pier were conducted by the parametric modeling technique, and then 3D cell library interface was developed. An nterface module was also developed using VBA(Visua basic Application) for exchanging a data from 3D model library to other softwares such as Microstation, AutoCad and Excel and was connected with MS Access database. The developed information model interface module would improve the design quality of the modular pier and reduce the time and cost for design. Updated 3D information models could be utilized for the fabrication, assembly, and construction process for modular piers.

Study on Simulation Model Generation of a Shipyard Panel Block Shop using a Neutral Data Format for Production Information (생산 정보의 중립 데이터 포맷을 이용한 조선소 판넬 공장의 시뮬레이션 모델 생성에 관한 연구)

  • Lee, Dong Kun;Back, Myung Gi;Lee, Kwangkook;Park, Jun Soo;Shin, Jong Gye
    • Journal of the Society of Naval Architects of Korea
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    • v.50 no.5
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    • pp.314-323
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    • 2013
  • Production simulation technology is beneficial to solve the complicated and fluctuated problems in a shipyard. It takes too much time and effort to build simulation models in the field, though. This research proposes a feasible method to reduce the difficulties related to simulation modeling for the factory or shop capacity analysis. In addition, a proposed neutral data format for production information is efficient to manage information acquisition for simulation modeling automation. A panel block shop model is contributed to comparison between the conventional technique and the automated one. The automation technique is highly recommended to run a rapid simulation in the shipyard problem.

A Study on the Business Process Model for sustainable Supply Chain (지속가능한 공급사슬(Supply Chain)을 위한 비즈니스 프로세스 모델 연구)

  • Ahn, Kyeong Rim;Lee, Ju Yeon
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.10 no.1
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    • pp.181-193
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    • 2014
  • The environment of supply chains is rapidly changed to global and eco-freindly work process. However, at current environment, it is not easy to grasp work flow and to analyze energy efficiency. Improving energy efficiency and visibility for goods flow can contribute to increases in customer attitudes and reductions in overall production costs Additionally, it can lead to increases in work efficiency and reductions in overall production costs. Until recently, efforts to improve energy performance focused on manufacturing industry. Those efforts have expanded to the supply chain. In this paper, we perform business process modeling about supply chain for visibility and sustainability - information and component flows - from assembly plants to logistics. This paper defines the work and information flows by modeling the underlying logical structures of the supply chain and the business processes that determine impact of visibility and sustainability. We model processes using the modeling methodology specified by UN/CEFACT. This methodology explains business process functionality and business transactions by UML diagram. The output of this paper would be useful in grasping work flow and capturing the used energy.

A Dynamic Modeling & State Sensitivity Analysis of the Surface Mounting Device (Surface Mounting Device의 동역학적 모델링 및 상태 민감도 해석)

  • Jang, Jinhee;Han, Changsoo;Kim, Jungduck
    • Journal of the Korean Society for Precision Engineering
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    • v.13 no.7
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    • pp.90-99
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    • 1996
  • In the area of assembly process of micro-chips and electronic parts on the printed circuit board, surface mounting device(SMD) is used as a fundamental tool. Generally speaking, the motion of the SMD is based on the ball screw system operated by any type of actuators. The ball screw system is a mechanical transformed which converts the mechanical rotational motion to the translational one. Also, this system could be considered as an efficient motion device against mechanical backlash and friction. Therefore a dynamic modeling and state sensitivity analysis of the ball screw system in SMD have to be done in the initial design stage. In this paper, a simple mathematical dynamic model for this system and the sensit- ivity analysis are mentioned. Especially, the bond graph approach is used for graphical modeling of the dynamic system before analysis stage. And the direct differentiation method is used for the state sensit- ivity analysis of the system. Finally, some trends for the state variables with respect to the design variables could be suggested for the better design and faster operating based on the results of dynamic and state sensitivity.

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