• Title/Summary/Keyword: Modeling&Simulation

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A Process-centric Simulation Modeling Method Improving Product, Process, and Facility Information Representation Method (제품, 공정, 설비 정보 표현 방법을 개선한 공정 중심 시뮬레이션 모델링 방법)

  • Baek, Seon-Jung;Oh, Daekyun;Lee, Dong Kun;Lee, Philippe;Ryu, Cheolho;Woo, Jong Hun;Jeong, Yong-Kuk
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.23 no.4
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    • pp.421-431
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    • 2017
  • A process-centric simulation modeling method has been proposed to define a shipbuilding simulation model. Existing modeling methods have limitations for expressing various production information for a shipyard. The advanced process-centric modeling method proposed in this paper offers an improvement, effectively representing production information and constraints for a shipyard. To achieve this, a method and diagram components to define a process-centric simulation model in detail have been suggested. The modeling method can assign priorities when multiple products and facilities are assigned to the process. And layer concept was applied to express simulation model with hierarchical structure. To verify the effectiveness of the modeling method, comparative analysis has been performed and the actual shipbuilding process has been modeled using the proposed method. When a single facility was used for various purposes, we found that the proposed method was more advantageous than existing methods. As a result, it was possible to express constraints and flows that were difficult to identify with existing process-centric simulation modeling methods, and the methods were improved for use in shipyard production planning verification simulations.

Research on Ontology-based Task Adaptability Improvement for Digital Human Model (온톨로지 기반 디지털 휴먼모델의 작업 적응성 제고 방안 연구)

  • Kang, Su-Ho;Sohn, My-E
    • Korean Journal of Computational Design and Engineering
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    • v.17 no.2
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    • pp.79-90
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    • 2012
  • In digital virtual manufacturing simulation, Digital Human widely used to optimal workplace design, enhancing worker safety in the workplace, and improving product quality. However, the case of ergonomics simulation solutions to support digital human modeling, Optimal DHM (Digital Human Model) data needed to develop and perform DHM will collect information related to the production process. So simulation developer has burden of collecting information. In this study, to overcome the limitations of existing solutions, we proposed the ADAGIO(Automated Digital humAn model development for General assembly usIng Ontology) framework. The ADAGIO framework was developed for DHM ontology to support optimal deployment of digital virtual environment and in order to ensure consistency of simulation components that are required for simulation modeling was made of a library.

EMTDC Modeling Method of Resistive type Superconducting Fault Current Limiter

  • Taejeon Huh;Lee, Jaedeuk;Park, Minwon;Yu, In-Keun
    • Progress in Superconductivity and Cryogenics
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    • v.5 no.1
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    • pp.60-65
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    • 2003
  • An effective modeling and simulation scheme of a resistive type Superconducting fault Current Limiter (SFCL) using PSCAD/EMTDC is proposed in this paper. In case of High Temperature Superconducting (HTS) resistive type fault current limiter current limiting is implemented by the ultra-fast transition characteristics from the superconducting (non-resistive) state to the normal (resistive) state by overstepping the critical current density. The states can generally be divided into three sub-states: the superconducting state the quench state and the recovery state respectively. In order to provide alternative application schemes of a resistive type SFCL, an effective modeling and simulation method of the SFCL is necessary. For that purpose, in this study, an actual experiment based component model is developed and applied for the simulation of the real resistive type SFCL using PSCAD/EMTDC. The proposed simulation scheme can be implemented to the grid system readily under various system conditions including sort of faults and the system capacity as well. The simulation results demonstrate the effectiveness of the proposed model and simulation scheme.

Development of the Object-oriented Powertrains Dynamic Simulation Program (객체지향 동력전달계 동적 시물레이션 프로그램 개발 연구)

  • Han, Hyung-Suk;Lee, Jai-Kyung;Kim, Hyun-Soo;Lim, Won-Sik
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.693-698
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    • 2003
  • The application of object-oriented modeling to develop a powertrain performance simulation program, called P-DYN, is introduced. Powertrain components, such as the engine, transmission, shaft, clutch are modeled as classes which have data and method by using object-oriented modeling methodology. P-DYN, a performance simulation program, based on the object-oriented modeling is made in C++. One powertrain example is simulated through the P-DYN. It is expected that the simulation program or individual class constructed in this paper would be useful for automotive engineers in predicting the performance of powertrains and developing a simulation program.

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Large-Scale Integrated Network System Simulation with DEVS-Suite

  • Zengin, Ahmet
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.4 no.4
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    • pp.452-474
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    • 2010
  • Formidable growth of Internet technologies has revealed challenging issues about its scale and performance evaluation. Modeling and simulation play a central role in the evaluation of the behavior and performance of the large-scale network systems. Large numbers of nodes affect simulation performance, simulation execution time and scalability in a weighty manner. Most of the existing simulators have numerous problems such as size, lack of system theoretic approach and complexity of modeled network. In this work, a scalable discrete-event modeling approach is described for studying networks' scalability and performance traits. Key fundamental attributes of Internet and its protocols are incorporated into a set of simulation models developed using the Discrete Event System Specification (DEVS) approach. Large-scale network models are simulated and evaluated to show the benefits of the developed network models and approaches.

Stochastic Modeling and Concurrent Simulation of the Game of Golf

  • Yoon, Sung-Roh;Lee, Se-Il;Oh, Seong-Jun
    • ETRI Journal
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    • v.31 no.6
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    • pp.809-811
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    • 2009
  • We propose a novel simulation method for modeling the game of golf using SystemC, a system description language that allows modeling of a concurrent system's behavior. Utilizing the proposed simulator, we compare different outing formats of golf, namely, regular and shotgun, in terms of playing time. Our simulation results reveal that the shotgun format can take longer than the regular format if the number of groups in a golf course exceeds 33 for the scenario we tested, confirming the belief that the shotgun format can take longer than the regular format. We also justify our simulation by comparing the simulation and analytical results.

A Study on the Modeling and Simulation of LED Driver Using HV9910 IC (HV9910 IC를 사용한 LED driver 모델링 및 시뮬레이션에 관한 연구)

  • Han, Soo-Bin;Park, Suck-In;Jeong, Hak-Geun;Chae, Su-Yong;Song, Eu-Gine;Jung, Bong-Man
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.4
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    • pp.14-21
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    • 2012
  • This paper study a method of modeling and simulation of LED driver circuit for a design optimization. Simplified LED modeling is introduced and a driver IC, HV9910, is modeled by implementing the major function blocks. Circuit of buck type converter is constructed for simulation. Simulation includes not only the internal function of IC but also the various performance results such as LED array current control and dimming. Experiment results are also shown to prove the verification of its usage. This results show that the simulation approach is valid for a circuit optimization and a reduction of development time.

Performance Improvement Using Modeling and Simulation of a Homo-polar Generator (단극발전기의 모델링 및 시뮬레이션을 이용한 성능개선)

  • Kim, In-Soo;Seong, Se-Jin
    • The Transactions of the Korean Institute of Power Electronics
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    • v.12 no.3
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    • pp.213-220
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    • 2007
  • As the equipments with the fast load characteristics become popular, a onboard generator should satisfy the fast response characteristics. This paper describes the modeling, simulation and experiment of the homo-polar generator developed for the fast load. The simulation model of a homo-polar generator with input limiter is developed, and the optimal gain to improve the response characteristics can be determined by simulation and analysis. The improved bandwidth and stability of the developed generator with optimal gain are verified by simulation and experiment.

Hybrid Systems Modeling and Simulation - PartI: Modeling and Simulation Methodology (하이브리드 시스템 모델링 및 시뮬레이션 - 제1부: 모델링 및 시뮬레이션 방법론)

  • 임성용;김탁곤
    • Journal of the Korea Society for Simulation
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    • v.10 no.3
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    • pp.1-14
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    • 2001
  • A hybrid system is defined as a mixture of continuous systems and discrete event systems. This paper first proposes a framework for hybrid systems modeling, called Hybrid Discrete Event System Specification (HDEVS) formalism. It then presents a method for simulators interoperation in which a continuous system simulator and a discrete event simulator are executed together in a cooperative manner. The formalism can specify a hybrid system in a way that a continuos system and a discrete event system are separately modeled by their own specification formalisms with a support of well-defined interface. We call such interface an A/E converter for analog-to- event conversion and an E/A converter for event-to-analog conversion. Simulators interoperation is based on the concept of pre-simulation in which simulation time for a continuous simulator is advanced in accordance with a discrete event simulator.

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