• 제목/요약/키워드: Hybrid simulation

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가변 속도 드라이버 부하에 대한 순시 전력 보상을 이용한 복합형 전력 필터의 설계와 시뮬레이션 (A Design and Simulation of Hybrid Power Filter for ASD Loads Based on Instantaneous Power Compensation Theory)

  • 조진호
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2000년도 춘계학술대회논문집 - 한국공작기계학회
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    • pp.385-390
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    • 2000
  • This paper deals with the design and simulation of the hybrid power filter to compensate reactive power and harmonic components of nonlinear load. Control target is a 3-phase diode full bridge rectifier with L-R-C nonlinear load, this load is assumed adjustable speed driver(ASD). The hybrid filter consists of a shunt active filter, shunt passive filters and series inductors. Control algorithm is based on instantaneous power compensation theory proposed by H.Akagi and etc. The result from simulation shows the hybrid filter is superior than other filters on the point of compensation performance and low cost. The PSCAD/EMTDC 3.0 is used as simulation tools.

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수치해석을 이용한 하이브리드 용접부의 열분포 및 용접잔류응력 분포에 관한 연구 (A Study on the Heat Distribution and Welding Residual Stress of Hybrid Laser-MIG Weld by Numerical Simulation)

  • 오종인;방한서;김영표;이진욱
    • 대한용접접합학회:학술대회논문집
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    • 대한용접접합학회 2004년도 추계학술발표대회 개요집
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    • pp.61-63
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    • 2004
  • Recently many research works are going on in the field of application of Laser-Arc hybrid welding for superstructures such as shipstructures. However, the study on heat distribution and welding residual stress of hybrid weld by numerical simulation loaves much to be desired. Therefore in this study an optimized welding condition and numerical simulation for hybrid welding by using Previous numerical analysis which was used to calculate the kent source for hybrid welding has been analyzed.

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Verification of a hybrid control approach for spacecraft attitude stabilization through hardware-in-the-loop simulation

  • Kim, Sung-Woo;Park, Sang-Young
    • 한국우주과학회:학술대회논문집(한국우주과학회보)
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    • 한국우주과학회 2011년도 한국우주과학회보 제20권1호
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    • pp.32.2-32.2
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    • 2011
  • State dependent Riccati equation (SDRE) control technique has been widely used in the control society. Although it solves nonlinear optimal control problems, which minimizes state error and control efforts simultaneously, it has drawbacks when it is to be applied to the real time systems in that it requires much computational efforts. So the real time system whose computational ability is limited (for example, satellites) cannot afford to use SDRE controller. To solve this problem, a hybrid controller which is based on MSDRE (Modified SDRE) and ANFIS (Adaptive Neuro-Fuzzy Inference System) has been proposed by Abdelrahman et al. (2010). We propose a hybrid controller based on SDRE and ANFIS, and apply the hybrid controller to the hardware attitude simulator to perform a HIL (Hardware-In-the-Loop) simulation. Through HIL simulation, it is demonstrated that the hybrid controller satisfies the control requirement and the computation load is reduced significantly. In addition, the effects of statistical properties of the ANFIS training data to the performance of the ANFIS controller have been analyzed.

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Power Control modeling and Simulation of Hybrid Power System for Building Microgrid Connected Application

  • Yoon, Gi-Cap;Cho, Jae-Hoon;Hong, Won-Pyo
    • 조명전기설비학회논문지
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    • 제23권11호
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    • pp.84-93
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    • 2009
  • In this paper, we propose to study the possibility of using a photovoltaic system combined with a high speed micro-turbine. This hybrid system can work as stand-alone system or grid connected system as it will be a part of a micro-grid. Initially, we propose Matlab/Simulink dynamic models of photovoltaic, micro turbine systems and supercapacitor. Then, we carry out a simulation comparison of the two systems, this is, with supercapacitor and without supercapacitor bank. We show that supercapacitor bank as short-term storage device was necessary to reduce the fast fluctuation of power in the case of sensitive loads. It is verified the simulation results of Matlab/Simulink based hybrid power system represent the effectiveness of the suggested hybrid power system.

시뮬레이션과 수리모델을 이용한 생산-분배 계획 (A HYBRID SIMULATION- ANALYTIC METHOD FOR PRODUCTION-DISTRIBUTION PLANNING)

  • 김숙한;이영해
    • 한국시뮬레이션학회:학술대회논문집
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    • 한국시뮬레이션학회 2000년도 춘계학술대회 논문집
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    • pp.57-66
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    • 2000
  • Production-distribution planning is the most important part in supply chain management (SCM). To solve this planning problem, either analytic or simulation approach has been developed. However these two approaches have their own demerits in problem solving. In this paper, we propose a hybrid approach which is a specific problem solving procedure combining analytic and simulation method to solve production-distribution problems in supply chain. The machine capacity and distribution capacity constraints in the analytic model are considered as stochastic factors and adjusted by the proposed specific process according to the results from independently developed simulation model which includes general production-distribution characteristics.

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CFD simulation of vortex-induced vibration of free-standing hybrid riser

  • Cao, Yi;Chen, Hamn-Ching
    • Ocean Systems Engineering
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    • 제7권3호
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    • pp.195-223
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    • 2017
  • This paper presents 3D numerical simulations of a Free Standing Hybrid Riser under Vortex Induced Vibration, with prescribed motion on the top to replace the motion of the buoyancy can. The model is calculated using a fully implicit discretization scheme. The flow field around the riser is computed by solving the Navier-Stokes equations numerically. The fluid domain is discretized using the overset grid approach. Grid points in near-wall regions of riser are of high resolution, while far field flow is in relatively coarse grid. Fluid-structure interaction is accomplished by communication between fluid solver and riser motion solver. Simulation is based on previous experimental data. Two cases are studied with different current speeds, where the motion of the buoyancy can is approximated to a 'banana' shape. A fully three-dimensional CFD approach for VIV simulation for a top side moving Riser has been presented. This paper also presents a simulation of a riser connected to a platform under harmonic regular waves.

Faster-than-real-time Hybrid Automotive Underwater Glider Simulation for Ocean Mapping

  • Choi, Woen-Sug;Bingham, Brian;Camilli, Richard
    • 해양환경안전학회지
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    • 제28권3호
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    • pp.441-450
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    • 2022
  • The introduction of autonomous underwater gliders (AUGs) specifically addresses the reduction of operational costs that were previously prohibited with conventional autonomous underwater vehicles (AUVs) using a "scaling-down" design philosophy by utilizing the characteristics of autonomous drifters to far extend operation duration and coverage. Long-duration, wide-area missions raise the cost and complexity of in-water testing for novel approaches to autonomous mission planning. As a result, a simulator that supports the rapid design, development, and testing of autonomy solutions across a wide range using software-in-the-loop simulation at faster-than-real-time speeds becomes critical. This paper describes a faster-than-real-time AUG simulator that can support high-resolution bathymetry for a wide variety of ocean environments, including ocean currents, various sensors, and vehicle dynamics. On top of the de facto standard ROS-Gazebo framework and open-sourced underwater vehicle simulation packages, features specific to AUGs for ocean mapping are developed. For vehicle dynamics, the next-generation hybrid autonomous underwater gliders (Hybrid-AUGs) operate with both the buoyancy engine and the thrusters to improve navigation for bathymetry mappings, e.g., line trajectory, are is implemented since because it can also describe conventional AUGs without the thrusters. The simulation results are validated with experiments while operating at 120 times faster than the real-time.

Fabrication of Hybrid Composite Plates with an Active Frequency Selective Surface

  • Seo, Yun-Seok;Chun, Heoung-Jae;Hong, Ic-Pyo;Park, Young-Bae;Kim, Yoon-Jae
    • Composites Research
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    • 제30권5호
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    • pp.273-279
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    • 2017
  • This paper describes the fabrication techniques and analysis of hybrid composite plates with an active frequency selective surface (FSS). For fabricating hybrid composite plate with active FSS, an active FSS with a resonance frequency located in the C band can obtained using varactor diodes. The hybrid composite plate was first designed and simulated to determine its electromagnetic properties using the commercial software HFSS. After simulation, active FSSs and hybrid composite plates were fabricated by mounting with varactor diodes. After fabrication, free space measurement was used to determine the electromagnetic properties of active FSS and the hybrid composite plates. The simulation and experimental results were in good agreement.

알루미늄-복합재료 혼성 사각관 보의 굽힘 성능평가 (Bending Performance Evaluation of Aluminum-Composite Hybrid Square Tube Beams)

  • 이성혁;최낙삼
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2005년도 춘계학술발표대회 논문집
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    • pp.76-79
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    • 2005
  • Bending deformation and energy absorption characteristics of aluminum-composite hybrid tube beams have been analyzed for improvement in the bending performance of aluminum space frame by using experimental tests combined with theoretical and finite element analyses. Hybrid tube beams composed of glass fabric/epoxy layer wrapped around on aluminum tube were made in autoclave with the recommended curing cycle. Basic properties of aluminum material used for initial input data of the finite element simulation and theoretical analysis were obtained from the true stress-true strain curve of specimen which had bean extracted from the Al tube beam. A modified theoretical model was developed to predict the resistance to the collapse of hybrid tube beams subjected to a bending load. Theoretical moment-rotation angle curves of hybrid tube beams were in good agreement with experimental ones, which was comparable to the results obtained from finite element simulation. Hybrid tube beams strengthened by composite layer on the whole web and flange showed an excellent bending strength and energy absorption capability.

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공동주택의 하이브리드 환기시스템 성능평가 연구 (A Study on the Performance of the Hybrid Ventilation System for Apartment Houses)

  • 전주영;김길태;김상희
    • 토지주택연구
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    • 제3권1호
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    • pp.89-96
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    • 2012
  • 본 연구는 공동주택에서 하이브리드 환기시스템의 적용성을 검토하고, 하이브리드 환기시스템의 성능을 향상하기 위해 CFD시뮬레이션을 이용하여 설계방안을 제시하고자 하였다. 연구대상으로는 전용 $51m^2$, $84m^2$의 공동주택을 선정하였으며, 하이브리드 환기시스템은 창틀자연급기와 각실을 덕트로 연결하여 배기하는 시스템(Hybrid 1)과 창틀자연급기와 욕실 거실배기가 혼합된 시스템(Hybrid 2)을 적용하였다. 이때 각 시스템별 배기구의 위치를 변수로 하여 CFD를 수행하였다. $51m^2$, $84m^2$ 모두 Hybrid 2가 Hybrid 1보다 환기효율이 우수한 것으로 나타났으며, 평균공기연령 또한 낮은 것으로 나타났다. Hybrid 1의 경우, 덕트 배기구의 위치가 각 실 입구에 설치하는 것보다 실 안쪽 모서리에 설치하여 기류이동을 많이 유발할 수 있는 유형이 효과적인 것으로 나타났다. Hybrid 2의 경우, 욕실 고정압팬에 덕트를 연결하여 거실중심에 배기구를 설치하는 시스템이 환기효율이 가장 우수한 것으로 나타났다. 그러나 $51m^2$의 경우 Hybrid 2가 Hybrid 1보다 20%의 향상된 환기효율을 나타낸 반면, $84m^2$의 경우는 14%의 향상된 환기효율을 나타내 공동주택 규모에 따른 적정한 하이브리드 환기시스템에 대한 검토가 필요하다.