• 제목, 요약, 키워드: Dynamic Simulation

검색결과 6,434건 처리시간 0.073초

컴퓨터 시뮬레이션과 실규모 하드웨어시뮬레이터를 이용한 계통연계 풍력발전의 응동특성 분석 (Dynamic Interaction Analysis of Interconnected Wind Power Generator using Computer Simulation and Real-Size Hardware Simulator)

  • 윤동진;한병문;최영도;전영수;정병창;정용호
    • 대한전기학회:학술대회논문집
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    • pp.1047_1048
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    • 2009
  • This paper describes comparative analysis results about the dynamic interaction of interconnected wind power system using the actual-size hardware simulator and the simulation model with PSCAD/EMTDC. The hardware simulator, which is composed of 2.0MVA induction motor with drive system and 1.5MW doubly-fed induction generator, was built and tested in Go-Chang Test Site of KEPCO for analyzing the dynamic interaction with the interconnected distribution system. The operation of hardware simulator was verified through comparative analysis between experimental results and simulation results obtained by simulation model with PSCAD/EMTDC. The developed hardware simulator and simulation model could be effectively used for analyzing the dynamic interaction, which has various phenomena depending on the wind variation and the network state of interconnected power system.

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Dynamic simulation models for seismic behavior of soil systems - Part I: Block diagrams

  • Sahin, Abdurrahman
    • Geomechanics and Engineering
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    • v.9 no.2
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    • pp.145-167
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    • 2015
  • Digital simulation has recently become the preferred method for designing complex and dynamic systems. Simulation packages provide interactive, block-diagram environment for modeling and simulating dynamic models. The block diagrams in simulation models are flowcharts which describe the components of dynamic systems and their interaction. This paper is the first part of the study for determining the seismic behavior of soil systems. The aim of this part is to present the constructed block diagrams for discrete-time analysis of seismic site amplification in layered media for vertically propagating shear waves. Detailed block diagrams are constructed for single and multiple soil layers by considering wave propagation with and without damping, respectively. The block diagrams for recursive filter to model attenuation in discrete-time form are also constructed. Finite difference method is used for strain calculation. The block diagrams are developed by utilizing Simulink which is a software add-on to Matlab.

열펌프 가열식 온수기의 동적특성 해석 (Numerical Simulation on Dynamic Characteristics of a Water Heater System Driven by a Heat Pump)

  • 김민성;김민수;백남춘
    • 설비공학논문집
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    • v.14 no.1
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    • pp.10-20
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    • 2002
  • A dynamic model of a water heater system heated by a heat pump was developed. The water heater system was composed of heat pump and hot water reservoirs. Finite volume method (FVM) was applied to describe the heat exchangers. A new constraint on electronic expansion valve (EEV) or thermostatic expansion valve (TXV) that can control superheat after the evaporator was developed. Dynamic performances were evaluated for various sizes of the reservoir. In order to compare those performances, time scale was normalized by time constant representing the characteristics of reservoir size. Time constant was determined from quasi steady-state simulation of the system. From the simulation, the size of the water heater reservoir was found to have a large influence on the transient performance of the sys- tem. Therefore, the optimization of the reservoir size is needed in a design process.

A Systolic Parallel Simulation System for Dynamic Traffic Assignment : SPSS-DTA

  • Park, Kwang-Ho;Kim, Won-Kyu
    • 지능정보연구
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    • v.6 no.1
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    • pp.113-128
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    • 2000
  • This paper presents a first year report of an ongoing multi-year project to develop a systolic parallel simulation system for dynamic traffic assignment. The fundamental approach to the simulation is systolic parallel processing based on autonomous agent modeling. Agents continuously act on their own initiatives and access to database to get the status of the simulation world. Various agents are defined in order to populate the simulation world. In particular existing modls and algorithm were incorporated in designing the behavior of relevant agents such as car-following model headway distribution Frank-Wolf algorithm and so on. Simulation is based on predetermined routes between centroids that are computed off-line by a conventional optimal path-finding algorithm. Iterating the cycles of optimization-then-simulation the proposed system will provide a realistic and valuable traffic assignment. Gangnum-Gu district in Seoul is selected for the target are for the modeling. It is expected that realtime traffic assignment services can be provided on the internet within 3 years.

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FEM을 이용한 자기부상열차/궤도 동적 상호작용 시뮬레이션 (Simulation of Dynamic Interaction Between Maglev and Guideway using FEM)

  • 한형석;김동성;이종민;강흥식
    • 한국철도학회:학술대회논문집
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    • pp.363-368
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    • 2004
  • Maglev vehicles, which are levitated and propelled by electromagnets, often run on elevated guideways comprised of steel, aluminum and concrete. Therefore, an analysis of the dynamic interaction between the Maglev vehicle and the guideway is needed in the design of the critical speed, ride, controller design and weight reduction of the guideway. This study introduces a dynamic interaction simulation technique that applies FEM. The proposed method uses FEM to model the elevated guideway and the Maglev vehicle, which is different from conventional studies. Because the proposed method uses FEM, it is useful to calculate the deformation of the elevated guideway, the dynamic stress, and the motion of the vehicle. By applying the proposed method to an urban transit Maglev vehicle, UTM01, the dynamic response is simulated according to velocity increase and can be reviewed again. From the result of the study, we concluded that FEM simulation of the dynamic interaction between the maglev vehicle and the guideway is possible.

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동력학 모델을 이용한 인체 동작 제어 (Human Motion Control Using Dynamic Model)

  • 김창회;오병주;김승호
    • 대한인간공학회지
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    • v.18 no.3
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    • pp.141-152
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    • 1999
  • In this paper, We performed the human body dynamic modelling for the realistic animation based on the dynamical behavior of human body, and designed controller for the effective control of complicate human dynamic model. The human body was simplified as a rigid body which consists of 18 actuated degrees of freedom for the real time computation. Complex human kinematic mechanism was regarded as a composition of 6 serial kinematic chains : left arm, right arm, support leg, free leg, body, and head. Based on the this kinematic analysis, dynamic model of human body was determined using Newton-Euler formulation recursively. The balance controller was designed in order to control the nonlinear dynamics model of human body. The effectiveness of designed controller was examined by the graphical simulation of human walking motion. The simulation results were compared with the model base control results. And it was demonstrated that, the balance controller showed better performance in mimicking the dynamic motion of human walking.

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High-Resolution Numerical Simulation of Respiration-Induced Dynamic B0 Shift in the Head in High-Field MRI

  • Lee, So-Hee;Barg, Ji-Seong;Yeo, Seok-Jin;Lee, Seung-Kyun
    • Investigative Magnetic Resonance Imaging
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    • v.23 no.1
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    • pp.38-45
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    • 2019
  • Purpose: To demonstrate the high-resolution numerical simulation of the respiration-induced dynamic $B_0$ shift in the head using generalized susceptibility voxel convolution (gSVC). Materials and Methods: Previous dynamic $B_0$ simulation research has been limited to low-resolution numerical models due to the large computational demands of conventional Fourier-based $B_0$ calculation methods. Here, we show that a recently-proposed gSVC method can simulate dynamic $B_0$ maps from a realistic breathing human body model with high spatiotemporal resolution in a time-efficient manner. For a human body model, we used the Extended Cardiac And Torso (XCAT) phantom originally developed for computed tomography. The spatial resolution (voxel size) was kept isotropic and varied from 1 to 10 mm. We calculated $B_0$ maps in the brain of the model at 10 equally spaced points in a respiration cycle and analyzed the spatial gradients of each of them. The results were compared with experimental measurements in the literature. Results: The simulation predicted a maximum temporal variation of the $B_0$ shift in the brain of about 7 Hz at 7T. The magnitudes of the respiration-induced $B_0$ gradient in the x (right/left), y (anterior/posterior), and z (head/feet) directions determined by volumetric linear fitting, were < 0.01 Hz/cm, 0.18 Hz/cm, and 0.26 Hz/cm, respectively. These compared favorably with previous reports. We found that simulation voxel sizes greater than 5 mm can produce unreliable results. Conclusion: We have presented an efficient simulation framework for respiration-induced $B_0$ variation in the head. The method can be used to predict $B_0$ shifts with high spatiotemporal resolution under different breathing conditions and aid in the design of dynamic $B_0$ compensation strategies.

DYNAMIC SIMULATION MODEL OF A HYBRID POWERTRAIN AND CONTROLLER USING CO-SIMULATION - PART I: POWERTRAIN MODELLING

  • Cho, B.;Vaughan, N.D.
    • International Journal of Automotive Technology
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    • v.7 no.4
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    • pp.459-468
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    • 2006
  • The objective of this paper is the development of the forward-looking dynamic simulation model of a hybrid electric vehicle(HEV) for a fuel economy study. The specification of the vehicle is determined based on two factors, engine peak power to curb weight ratio and specific engine power. The steady state efficiency models of the powertrain components are explained in detail. These include a spark ignition direct injection(SIDI) engine, an integrated starter alternator(ISA), and an infinitely variable transmission(IVT). The paper describes the integration of these models into a forward facing dynamic simulation diagram using the AMESim environment. Appropriate vehicle and driver models have been added and described. The controller was designed in Simulink and was combined with the physical powertrain model by the co-simulation interface. Finally, the simulation results of the HEV are compared with those of a baseline vehicle in order to demonstrate the fuel economy potential. Results for the vehicle speed error and the fuel economy over standard driving cycles are illustrated.

Prototype Microgrid의 동특성 모의에 관한 연구 (A Study on Simulation of Dynamic Characteristics in Prototype Microgrid)

  • 최은식;최흥관;전진홍;안종보
    • 전기학회논문지
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    • v.59 no.12
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    • pp.2157-2164
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    • 2010
  • Microgrid is generally defined as cluster of small distributed generators, energy storages and loads. Through monitoring and coordinated control, microgrid can provide various benefits such as reduction of energy cost, peak shaving and power quality improvement. In design stage of microgrid, system dynamic simulation is necessary for optimizing of sizing and siting of DER(distributed energy resources). As number of the system components increases, simulation time will be longer. This problem can restrict optimal design. So we used simplified modeling on energy sources and average switching model on power converters to reduce simulation time. The effectiveness of this method is verified by applying to prototype microgrid system, which is consist of photovoltaic, wind power, diesel engine generators, battery energy storage system and loads installed in laboratory. Simulation by Matlab/Simulink and measurements on prototype microgrid show that the proposed method can reduce simulation time not sacrificing dynamic characteristics.

시험자료를 이용한 굴삭기의 동역학 해석 (Dynamic analysis of an excavator using experimental data)

  • 유완석;김외조;이만형;윤경화
    • 대한기계학회논문집
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    • v.18 no.5
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    • pp.1150-1157
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    • 1994
  • This paper presents dynamic analysis of a hydraulic excavator based on experimental data. A three dimensional multibody model of a hydraulic excavator is modeled for the computer simulation. The hydraulic pressures acting on the cylinders are measured from experiments, and the forces exerting on the cylinders are calculated from the measured pressures. Using these forces, the dynamic analysis of the excavator is carried out to regenerate the motion in the computer simulation. A proper operation scheme is assumed to match the computational result and the experiment. The DADS program is used for the dynamic analysis.