• Title/Summary/Keyword: simulation model interface

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Implementation of Java/RTI Level One Test Procedures (Java/RTI를 위한 Level One Test Procedures 구현)

  • 이정욱;김용주;김영찬
    • Journal of the Korea Society for Simulation
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    • v.12 no.4
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    • pp.41-50
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    • 2003
  • HLA (High Level Architecture) is the object, time, and interface standard that proposed for distribution simulation in the US Department of Defense. The HLA is defined by three components: Rules, the HLA Interface Specification, and the Object Model Template (OMT). The RTI (Run-Time Infrastructure) software implements the interface specification. It provides services to simulation applications. To test whether a RTI software is suitable for the standard and all service was implemented is performed through two phases of processes proposed by DMSO. In this paper, we implement Level One Test Procedures of DMSO and apply to NetCust's RTI software. The experimental results are discussed.

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Monte Carlo simulation of interacting liquid crystal and substrate using rigid model molecules

  • Hyodo, Yosuke;Koda, Tomonori;Momoi, Yuichi;Kim, Woo-Yeol;Nishioka, Akihiro;Miyata, Ken;Murasawa, Go
    • 한국정보디스플레이학회:학술대회논문집
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    • 2007.08a
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    • pp.952-953
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    • 2007
  • In the present study, we propose MC simulation that takes interface phenomena between liquid crystal and substrate into consideration. We use rigid model molecules of liquid crystal and substrate. Interface is generated using potential field that induces decomposition of molecules.

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Physics-based Real-time Simulation of Deformable Body for Haptic Interface (햅틱 인터페이스를 위한 물리기반 변형체 실시간 시뮬레이션)

  • Jun, Seong-Ki;Choi, Jin-Bok;Cho, Maeng-Hyo
    • Proceedings of the KSME Conference
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    • 2004.04a
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    • pp.557-562
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    • 2004
  • For constructing virtual environment it is more natural to model object as deformable body than as rigid body. High accuracy of simulation of model and low-latency computational cost for real-time simulation should be guaranteed. We pre-compute Green function through finite element analysis of deformable body and it is possible to simulate deformation of body in real-time environment using Capacitance Matrix Algorithm. Also, the capacitance matrix algorithm enables to construct the haptic rendering which serves the reaction force through a haptic device. The Newmark scheme is used for the more realistic haptic rendering and dynamic simulation in real-time.

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Development of an Escalator Simulation Program for a Designer (설계자를 위한 에스컬레이터 전용 시뮬레이션 프로그램 개발)

  • 서종휘
    • Proceedings of the Korea Society for Simulation Conference
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    • 1999.04a
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    • pp.37-41
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    • 1999
  • When an escalator is developed or modified for improved performance, estimation of dynamic characteristics of the escalator is required. But modeling of the escalator for a design purpose is very difficult and time consuming process. Especially, it is very difficult for the designer to use the simulation model during design process because it takes time and also the designer needs to know how to use the simulation program. In order to solve these problems, a graphic user interface program that can predict dynamic characteristics of an escalator is developed for the designer. Since this program has the necessary complicated escalator model inside, the designer does not have to know how to use the simulation program and design parameters can be obtained while design is in progress. The developed designer oriented interface program is explained and an example is shown.

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System Level Network Simulation of Adaptive Array with Dynamic Handoff and Power Control (동적 핸드오프와 전력제어를 고려한 적응배열 시스템의 네트워크 시뮬레이션)

  • Yeong-Jee Chung;Jeffrey H. Reed
    • Journal of the Korea Society for Simulation
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    • v.8 no.4
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    • pp.33-51
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    • 1999
  • In this study, the system level network simulation is considered with adaptive array antenna in CDMA mobile communication system. A network simulation framework is implemented based on IS-95A/B system to consider dynamic handoff, system level network behavior, and deploying strategy into the overall CDMA mobile communication network under adaptive array algorithm. Its simulation model, such as vector channel model, adaptive beam forming antenna model, handoff model, and power control model, are described in detail with simulation block. In order to maximize SINR of received signal at antenna, Maximin algorithm is particularly considered, and it is computed at each simulation snap shot with SINR based power control and handoff algorithm. Graphic user interface in this system level network simulator is also implemented to define the simulation environments and to represent simulation results on real mapping system. This paper also shows some features of simulation framework and simulation results.

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Modeling and Analysis of a Ray Tracing Method for Non-Destructive Testing for Internal Defects (광선추적법을 이용한 비파괴 내부 결함 모델 및 해석)

  • Kim, Teak Gu;Kim, Joohan
    • Journal of the Korean Society for Precision Engineering
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    • v.32 no.1
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    • pp.75-81
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    • 2015
  • Modeling and analysis using a ray tracing method for internal defects were described. Reflection and refraction of rays on the interface of defects were modeled using the Harvey model and the Lambertian model. The diffraction on the interface of defects affected the incoming signals and it could evaluate any defects in the matter and its signal would be analyzed with the ray tracing simulation. The simulation results were compared with actual detecting signals and the ray tracing model was shown in good agreement with experimental data. This method has a possibility to be used as wave propagation modeling in non-destructive testing.

System Level Simulation of CDMA Network with Adaptive Array

  • Chung, Yeong-Jee;Lee, Jae-Woo
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.3 no.4
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    • pp.755-764
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    • 1999
  • In this study, the system level network simulation is considered with adaptive array antenna in CDMA mobile communication system. A network simulation framework is implemented based on IS-95A/B system to consider dynamic handoff, system level network behavior, and deploying strategy into the overall CDMA mobile communication network under adaptive array algorithm. Its simulation model, such as vector channel model, adaptive beam forming antenna model, handoff model, and power control model, are described in detail with simulation block. In order to maximize SINR of received signal at antenna, maximin algorithm is particularly considered, and it is computed at each simulation snap shot with SINR based power control and handoff algorithm. Graphic user interface in this system level network simulator is also implemented to define the simulation environments and to represent simulation results on real mapping system. This paper also shows some features of simulation framework and simulation results.

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Simulation of industrial multiphase flows (공학적 관점에서의 다상유동 문제의 수치해석)

  • Han aehoon;Alajbegovic Ales;Seo Hyeoncheol;Blahowsky Peter
    • Proceedings of the KSME Conference
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    • 2002.08a
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    • pp.389-392
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    • 2002
  • In many industrial applications, multiphase flow analysis is the norm rather than an exception as compared to more-conventional single-phase investigation. This paper describes the implementation of the multiphase flow simulation capability in the general purpose CFD software AVL FIRE/SWIFT. The governing equations are discretized based on a finite volume method (FVM) suitable fur very complex geometry, The pressure field is obtained using the SIMPLE algorithm. Depending on the characteristics of the multiphase flow to be examined, the user can choose either the two-fluid model or an explicit interface-tracking model based on the Volume-of-Fluid approach. For truly 'multi'-phase flow problems, it is also possible to apply a hybrid model where certain phases are explicitly tracked while the other phases are handled by the two fluid model. In order to demonstrate the capability of the method, applications to the Taylor bubble flow simulations are presented.

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Current Issues for ROK Defense Modeling & Simulation Scheme under the Transition of New HLA Simulation Architecture (HLA 모의구조전환에 따른 한국군 DM&S 발전방안)

  • 이상헌
    • Journal of the military operations research society of Korea
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    • v.26 no.2
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    • pp.101-119
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    • 2000
  • US DoD designated the High LEvel Architecture (HLA) as the standard technical architecture for all military simulation since 1996. HLA will supercede the current Distributed Interactive Simulation(DIS) and Aggregated LEvel Simulation Protocol(ALSP) methods by no funds for developing/modifying non-HLA compliant simulations. The new architecture specifies Rules which define relationships among federation components, an Objects Model Template which species the form which simulation elements are described, and an Interface Specification which describes the way simulations interact during operations. HLA is named as standard architecture in NATO, Australia and many other militaries. Also, it will be IEEE standard in the near future. It goes without saying that ROK military whose simulation models are almost from US must be prepared in areas such as ROK-US combined exercise, training, weapon system acquisition, interface models with C4I system, OPLAN analysis, operations, and os on. In this paper, we propose several effective alternatives and issues for ROK Defense Modeling and Simulation under the transition of new HLA architecture. Those include secure the kernel of new simulation technology and develop our own conceptual model, RTI software, prototype federation for each service and aggregated one. In order to challenge the new simulation architecture effectively, we should innovate our current defense modeling and simulation infrastructure such s manpower, organization, budget, research environment, relationships among academia and industry, and many others.

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Finite element modelling of the shear behaviour of profiled composite walls incorporating steel-concrete interaction

  • Anwar Hossain, K.M.;Wright, H.D.
    • Structural Engineering and Mechanics
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    • v.21 no.6
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    • pp.659-676
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    • 2005
  • The novel form of composite walling system consists of two skins of profiled steel sheeting with an in-fill of concrete. The behaviour of such walling under in-plane shear is important in order to utilise this system as shear elements in a steel framed building. Steel sheet-concrete interface governs composite action, overall behaviour and failure modes of such walls. This paper describes the finite element (FE) modelling of the shear behaviour of walls with particular emphasis on the simulation of steel-concrete interface. The modelling of complex non-linear steel-concrete interaction in composite walls is conducted by using different FE models. Four FE models are developed and characterized by their approaches to simulate steel-concrete interface behaviour allowing either full or partial composite action. Non-linear interface or joint elements are introduced between steel and concrete to simulate partial composite action that allows steel-concrete in-plane slip or out of plane separation. The properties of such interface/joint elements are optimised through extensive parametric FE analysis using experimental results to achieve reliable and accurate simulation of actual steel-concrete interaction in a wall. The performance of developed FE models is validated through small-scale model tests. FE models are found to simulate strength, stiffness and strain characteristics reasonably well. The performance of a model with joint elements connecting steel and concrete layers is found better than full composite (without interface or joint elements) and other models with interface elements. The proposed FE model can be used to simulate the shear behaviour of composite walls in practical situation.