• 제목/요약/키워드: analytical simulation

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유선 시뮬레이션 기법과 준해석해를 이용한 용질 거동 분석

  • 정대인;최종근;박광원
    • 한국지하수토양환경학회:학술대회논문집
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    • 한국지하수토양환경학회 2004년도 총회 및 춘계학술발표회
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    • pp.57-62
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    • 2004
  • Streamline simulation researches have been extensively accomplished due to the swiftness of computation and the reduction of numerical dispersion. In this study, we developed a streamline simulation model using a semianalytical solution of ID transport equation. To validate accuracy of the developed model, we compared simulation results of contaminant transport, which were acquired by streamline simulation models using an analytical solution, a numerical solution, and a semianalytical solution. The developed model using the semianalytical solution matched well with the model using an analytical solution. However, streamline simulation model using a numerical solution showed numerical dispersion. For an advection-dominant flow, there was little difference in the simulation results between the developed model and tile analytical model, but the differences between the analytical model and the numerical model were cleary shown. From the comparison of computing time we know that the streamline simulation using the semianalytical solution is 2-60 times as fast as the streamline simulation using the numerical solution.

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해안지하수개발 최적화수치모델과 해석해의 비교연구 (Comparison of a Groundwater Simulation-Optimization Numerical Model with the Analytical Solutions)

  • 시뢰;최뢰;이찬종;박남식
    • 한국수자원학회:학술대회논문집
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    • 한국수자원학회 2009년도 학술발표회 초록집
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    • pp.905-908
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    • 2009
  • In the management of groundwater in coastal areas, saltwater intrusion associated with extensive groundwater pumping, is an important problem. The groundwater optimization model is an advanced method to study the aquifer and decide the optimal pumping rates or optimal well locations. Cheng and Park gave the analytical solutions to the optimization problems basing on Strack's analytical solution. However, the analytical solutions have some limitations of the property of aquifer, boundary conditions, and so on. A simulation-optimization numerical method presented in this study can deal with non-homogenous aquifers and various complex boundary conditions. This simulation-optimization model includes the sharp interface solution which solves the same governing equation with Strack's analytical solution, therefore, the freshwater head and saltwater thickness should be in the same conditions, that can lead to the comparable results in optimal pumping rates and optimal well locations for both of the solutions. It is noticed that the analytical solutions can only be applied on the infinite domain aquifer, while it is impossible to get a numerical model with infinite domain. To compare the numerical model with the analytical solutions, calculation of the equivalent boundary flux was planted into the numerical model so that the numerical model can have the same conditions in steady state with analytical solutions.

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실시간 VOD 서버 시뮬레이터 설계 (A Design of Real-time VOD Server Simulator)

  • 정지영;김성수
    • 한국시뮬레이션학회논문지
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    • 제9권3호
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    • pp.65-75
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    • 2000
  • In recent years, significant advances in computers and communication technologies have made multimedia services feasible. As a result, various queuing models and cost models on architecture and data placement for multimedia server have been proposed. However, these analytical techniques use only probabilistic models to represent the behavior of a system, and then they have several limitations like accuracy. Simulation is a viable alternative to analytical model. It avoids many of the limitations associated with analytical techniques, allowing for more precise representation of system attributes like workload in program code. In this paper, we propose a simulation test bed that can evaluate performance of real-time multimedia server by using simulation model.

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자동차 제동장치의 시뮬레이션 시험 기법에 관한 연구 (A Study on the Techniques of Simulation Test in Automotive Braking System)

  • 민규식;김형섭
    • 한국안전학회지
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    • 제8권2호
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    • pp.23-29
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    • 1993
  • In this study, the method of deciding simulation test conditions is developed by computer program compared to actual vehicle test as accurately as possible. These results of analytical test conditions are conformed by simulation test using the brake dynamometer by comparison with test results of actual vehicle. Results of simulation test by these analytical results show good agreement with the vehicle test results. The analytical simulation test conditions provide the input data to brake dynamometer which follows : - each test inertia corresponding to braking deceleration - test condition of input control : brake line pressure - test condition of output control : braking torque

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포인트와 라인 세그먼트의 해석적 에러 검증을 위한 확률기반 시뮬레이션 모델에 관한 연구 (A Study on Stochastic Simulation Models to Internally Validate Analytical Error of a Point and a Line Segment)

  • 홍성철;주용진
    • Spatial Information Research
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    • 제21권2호
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    • pp.45-54
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    • 2013
  • 해석적 또는 시뮬레이션 오차 모델은 공간 데이터가 가지는 위치오차의 분포를 설명 하는데 유용하다. 그러나 두 오차 모델은 위치오차를 모델링을 하기위하여 다른 접근 방법을 이용하므로 정의된 조건 내에서 올바른 위치오차를 예측 하는지 확인하는 내적 검증을 필요로 한다. 이에 본 논문은 오차타원과 에러밴드 모델을 이용하여 제시한 포인트와 라인 세그먼트 시뮬레이션 오차 모델을 내부적으로 검증하는 방법을 제안하였다. 시뮬레이션 오차 모델은 분산-공분산 행렬(variance-covariance matrix)의 변수에 의해 규정된 확률분포에 따라 몬테카를로 시뮬레이션을 이용하여 위치오차들을 생성한다. 검증절차에서는 시뮬레이션 모델에 의한 위치오차의 집합을 해석적 오차 모델에 의한 이론적 위치오차와 비교하였다. 결과적으로 제안된 시뮬레이션 오차 모델은 정의된 위치오차에 따라 동일한 공간 데이터의 위치적 불확실성을 실현함을 확인할 수 있었다.

자동차 공기현가 공압회로 해석 및 대체회로 설계 (Analysis and Alternative Circuit Design of Pneumatic Circuit for An Automotive Air Suspension)

  • 이재천
    • 유공압시스템학회논문집
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    • 제5권4호
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    • pp.17-25
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    • 2008
  • This study presents an analytical model of the pneumatic circuit of an air suspension system to analyze the characteristics of vehicle height control. The analytical model was developed through the co-simulation of Simulink(air spring) and HyPneu(pneumatic circuit). Variant effective area of air spring and flow coefficients of pneumatic valves were estimated experimentally prior to the system test, and utilized in simulation. One-comer test apparatus was established using the components of commercial air suspension products. The results of simulation and experiment were so close that the proposed analytical model in this study was validated. However the frictional loss of conduit and heat dissipation which were ignored in this study need to be considered in future study. As an application example of proposed analytical model, an alternative pneumatic circuit of air suspension to conventional WABCO circuit was evaluated. The comparison of simulation results of WABCO circuit and alternative circuit show that proposed analytical model of co-simulation in this study is useful for the study of pneumatic system of automotive air suspension.

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신뢰성 이론을 이용한 고강도콘크리트 구조물의 축력-모멘트관계에 있어서의 해석방법에 대한 평가 (The Estimation of Analytical Method for Axial Force-Moment Relationships of High-Strength Concrete Structures using Reliability Theory)

  • 최광진;장일영;송재호;홍원기
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1998년도 봄 학술발표회논문집(II)
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    • pp.447-454
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    • 1998
  • The main object of the study is that axial force-moment relationships for high strength concrete structures using reliability theory(Linear statstical method, Monte Carlo Simulation) including probability conception. And mean stress factors and centroid factors proposed to high strength concrete structures using reliability theory(Linear statstical method, Monte Carlo Simulation). Finally, The established experimental data for axial force-moment relationships are compared to the analytical data(data for Linear statstical method and Monte Carlo Simulation) for axial force-moment relationships in this analytical method.

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Analytical and numerical simulation on charging behavior of no-insulation REBCO pancake coil

  • Quach, Huu Luong;Kim, Ji Hyung;Chae, Yoon Seok;Moon, Jae Hyung;Ko, Jung Hyup;Kim, Hyung-Wook;Kim, Seog-Whan;Jo, Young-Sik;Kim, Ho Min
    • 한국초전도ㆍ저온공학회논문지
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    • 제20권4호
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    • pp.16-19
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    • 2018
  • This paper presents analytical and numerical simulation approaches on charging characteristics of no-insulation (NI) REBCO pancake coil by using the equivalent circuit model to estimate magnetic performance response in the coil. The analytical methods provide closed form or definite solution in the form of complete mathematical expressions but they are hard to solve the complex problems. Numerical methods have become popular with the development of the computing capabilities to solve the problems which are impossible or very hard to solve analytically. First of all, the equivalent circuit model are proposed to develop the simulation code for both analytical and numerical method. The charging test was performed under critical current to obtain magnetic field induced and terminal voltage through the radial as well as spiral current paths within the coil. To verify the validity of both proposed methods, the simulation results were compared and discussed with the experimental results.

An Analytical Modeling and Simulation of Dual Material Double Gate Tunnel Field Effect Transistor for Low Power Applications

  • Arun Samuel, T.S.;Balamurugan, N.B.
    • Journal of Electrical Engineering and Technology
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    • 제9권1호
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    • pp.247-253
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    • 2014
  • In this paper, a new two dimensional (2D) analytical modeling and simulation for a Dual Material Double Gate tunnel field effect transistor (DMDG TFET) is proposed. The Parabolic approximation technique is used to solve the 2-D Poisson equation with suitable boundary conditions and analytical expressions for surface potential and electric field are derived. This electric field distribution is further used to calculate the tunnelling generation rate and thus we numerically extract the tunnelling current. The results show a significant improvement in on-current characteristics while short channel effects are greatly reduced. Effectiveness of the proposed model has been confirmed by comparing the analytical results with the TCAD simulation results.

Analytical Surface Potential Model with TCAD Simulation Verification for Evaluation of Surrounding Gate TFET

  • Samuel, T.S. Arun;Balamurugan, N.B.;Niranjana, T.;Samyuktha, B.
    • Journal of Electrical Engineering and Technology
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    • 제9권2호
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    • pp.655-661
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    • 2014
  • In this paper, a new two dimensional (2D) analytical modeling and simulation for a surrounding gate tunnel field effect transistor (TFET) is proposed. The Parabolic approximation technique is used to solve the 2-D Poisson equation with suitable boundary conditions and analytical expressions for surface potential and electric field are derived. This electric field distribution is further used to calculate the tunneling generation rate and thus we numerically extract the tunneling current. The results show a significant improvement in on-current characteristics while short channel effects are greatly reduced. Effectiveness of the proposed model has been confirmed by comparing the analytical results with the TCAD simulation results.