• Title/Summary/Keyword: Simulation Results

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The Study on the Dimensional Computer Simulation of Solidification behavior by FDM in Al-Bronze Casting (Al-bronze에 있어서 직접차분법에 의한 2차원 응고해석에 관한 연구)

  • Choe, Jeong-Gil;Jeong, Un-Jae;Kim, Dong-Ok
    • 한국기계연구소 소보
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    • s.17
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    • pp.111-123
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    • 1987
  • Two dimensional computer simulation of solidification behavior using FDM as simulation tool was applied to AI-bronze casting. By the comparison of computer simulation with the experimental results, it was showed that the final shrinkage position and solidification time are good accordance with results of computer simulation. It is expected that this software will be widely applied to casting design or rise ring for directional solidification.

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A design and simulation of a hydraulic control valve in transmission (트랜스 미션에 유압식 콘트롤밸브의 설계와 시뮬레이션)

  • 곽희성
    • 제어로봇시스템학회:학술대회논문집
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    • 1997.10a
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    • pp.167-174
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    • 1997
  • In this paper, the mathematical model of the hydraulic control valve is formulated, that is, this dynamic modeling which includes the motion equations and continuity equations can analyze the dynamic characteristics of the hydraulic control valve. The control valve for the transmission has the Over Speed Protection to protect a hydraulic travel motor. Therefore, this simulation shows the over speed protection and researches the main design parameters. The results of the computer simulation were assured through the experiment. From the comparison between both results, it is shown that this simulation program is useful and effective.

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DEVS Simulation of Purchase Strategies for Material Stock Control System (DEVS 시뮬레이션을 이용한 자재 재고 관리의 발주 전략에 관한 연구)

  • 문성진
    • Journal of the Korea Society for Simulation
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    • v.4 no.2
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    • pp.17-30
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    • 1995
  • One of many factors that influences the profit of an enterprise is the amount of the stock in an enterprise. When the stock amounts are optimal the economic burden of the enterprise decreases which in turn results in the optimum number of employment and spatial utilization of storages. The purpose of this study is the simulation modeling of a material stock control system using DEVS models in order to get the most suitable stock amounts. The stock within an enterprise is built by the orders from outside world. The effect on the stock by the factors such as order, delivery, and production components has been analyzed based on simulation results.

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Monte-Carlo Simulation for dust scattering in the Ophiuchus molecular complex

  • Lim, Tae-Ho;Min, Kyoung-Wook;Seon, Kwang-Il
    • The Bulletin of The Korean Astronomical Society
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    • v.35 no.2
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    • pp.71.2-71.2
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    • 2010
  • We present the results of FUV dust scattering simulation, which is based on the Monte-Carlo method. In this simulation, we focus on the multiple scattering in the Ophiuchus complex region because the single scattering case in the region already reported by Lee et al. 2008. We compare the simulation result to the FUV intensity with FIMS and the single scattering result. We also discuss the parameters related to the results of this simulation, such as asymmetry factor, albedo and other different setting-ups.

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A Simulation Model for Performance Evaluation of Air Defense-gun System (대공무기체계의 능력평가를 위한 시뮬레이션모델의 연구)

  • 황흥석
    • Journal of the Korea Society for Simulation
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    • v.9 no.4
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    • pp.77-85
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    • 2000
  • The object of this paper is developing of a simulation model for performance evaluation of ai defense-gun system. We developed a three-step kill probability of areal target in case of one gun on one target considering : 1) estimating the target and warhead intercept point, 2) target vulnerability and 3) computing the kill probability. We used a Monte Carlo simulation method. This model can be used for probabilistic analysis giving results of sufficient accuracy with minimum requirement of input data. Also we developed a computer program according proposed algorithm and a set of experimental results using the proposed method are shown.

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Simulation Analysis of Safety Evacuation in University Experiment Building

  • Tao Zhang;Ha-Sung Kong
    • International Journal of Internet, Broadcasting and Communication
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    • v.16 no.2
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    • pp.218-226
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    • 2024
  • According to the actual situation of a university, the emergency evacuation simulation is modeled based on the physical sign, evacuation speed and personnel ratio using the pathfinder software.The experimental construction export utilization rate is compared with the preliminary simulation scenario. The simulation results show that the utilization rate of evacuation stairs and evacuation exits is significantly improved.The optimized solution can provide the most effective evacuation passage, and the research results can provide the basis for the rational planning and management of evacuation passage in university experiment building.

Flow Analysis in the Tip Clearance of Axial Flow Rotor Using Finite-Element Large-Eddy Simulation Method (유한요소 LES법에 의한 축류 회전차 팁 틈새의 유동해석)

  • Lee, Myeong-Ho
    • Journal of Advanced Marine Engineering and Technology
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    • v.33 no.5
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    • pp.686-695
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    • 2009
  • Flow characteristics in linear axial cascade have been studied using large eddy simulation(LES) based on finite element method(FEM) to investigate details of the leakage flow in the tip clearance of axial flow rotor. STAR-CD(FVM) and PAT-Flow(FEM) have been adopted to solve the Navier-Stokes equations for the simulation of the unsteady turbulent flow. Numerical results from the present study have been compared with the existing experimental results to investigate a tip clearance effect on velocity profile and static pressure distribution on blade surface at various spanwise positions. Both simulation results agree well with the experimental data. However, it has been shown that the results of finite-element large-eddy simulation agree better with experimental data than $k-{\varepsilon}$ turbulent model based on finite volume method regarding the tip vortex geometry and static pressure distribution at the center of the tip vortex core. As a result of this study, it is shown that finite-element large-eddy simulation method can predict more exactly on the tip leakage vortex flow and behind flow field.

Large Eddy Simulation of Free Motion of Marine Riser using OpenFOAM (오픈폼을 활용한 자유진동하는 라이저 주위 유동의 LES 해석)

  • Jung, Jae-Hwan;Jeong, Kwang-Leol;Gill, Jae-Heung;Jung, Dongho
    • Journal of Ocean Engineering and Technology
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    • v.33 no.5
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    • pp.387-393
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    • 2019
  • In this study, the free motion of a riser due to vortex shedding was numerically simulated with Large Eddy Simulation (LES) and Detached Eddy Simulation (DES) turbulence models. A numerical simulation program was developed by applying the Rhie-Chow interpolation method to the pressure correction of the OpenFOAM standard solver pimpleDyMFoam. To verify the developed program, the vortex shedding around the fixed riser at Re = 3900 was calculated, and the results were compared with the existing experimental and numerical data. Moreover, the vortex-induced vibration of a riser supported by a linear spring was numerically simulated while varying the spring constant. The results are compared with published direct numerical simulation (DNS) results. The present calculation results show that the numerical method is appropriate for simulating the vortex-induced motion of a riser, including lock-in phenomena.

Dynamic Simulation for Modules of a Magnetically-Levitated Vehicle (자기부상열차 모듈의 동특성 시뮬레이션)

  • Kim, Jong-Moon
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.12
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    • pp.653-660
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    • 2006
  • In this paper, dynamic simulation results for modules of a magnetically-levitated(Maglev) vehicle are presented. The mathematical dynamic models for the Maglev vehicle are firstly derived. The Maglev system consists of one vehicle, two half-bogies, one guideway, four secondary suspensions, eight electromagnets and levitation control systems. Also, the dynamic characteristics are analysed by using the derived models. Finally, two simulations such as reference airgap step change of 1mm and rail step change of 1mm, are carried out. The dynamic simulation results are shown to testify the developed dynamic simulation program. From the results, we can see the possibility of the dynamic simulation program to develop a new Maglev vehicle system.

A Study on the Simulation of Leak Flow-rate Using Isothermal Chamber (등온화용기를 이용한 누설유량 시뮬레이션에 관한 연구)

  • Ji, S.W.;Jang, J.S.
    • Journal of Power System Engineering
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    • v.14 no.5
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    • pp.71-75
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    • 2010
  • Leak detection technology is a challenging research until nowadays, because it has wide and various applications in industry. Furthermore pneumatic component reliability test based on ISO requires air leakage measurement. The conventional measurement methods need a complex operation and the calibration of leak detector. Tracing the history of our study, we proposed a new method for measurement of leak flow rate using isothermal chamber. In this study, propose a simulation model of isothermal chamber by infinitesimal flow -rate, such as a leak flow-rate. The effectiveness of the proposed simulation model is proved by simulation and experimental results. Base on the comparison results, proposed simulation model is good agreement with experimental results.