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DAFUL과 Aerodyn을 활용한 풍력발전시스템의 동적거동 시뮬레이션 기술 개발
임채환(Chae Whan Rim),방제성(Je Sung Bang),문석준(Seok Jun Moon),정태영(Tae Young Chung),조희제(Huije Cho) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
Simulation technology for dynamic analysis of wind turbine is developed. The Aerodyn and the DAFUL are chosen for aerodynamic analysis and multi-body and flexible body dynamics respectively. Subroutines and variables of Aerodyn developed by NREL are analyzed with hub-height wind data, full field turbulent wind data and Airfoil data. The interface to perform coupled analysis between AeroDyn and DAFUL, GUI for modeling several parts of wind turbines are developed. The program will be extended to analyze the coupled analysis of aerodynamic and hydrodynamic behavior for floating offshore wind turbines.
임채환(Rim, Chae Whan),방제성(Bang, Je Sung),조희제(Cho, Huije),문석준(Moon, Seok Jun),정태영(Chung, Tae Young) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Simulation technology for dynamic analysis of wind turbine is developed. The Aerodyn and the DAFUL are chosen for aerodynamic analysis and multi-body and flexible body dynamics respectively. Subroutines and variables of Aerodyn developed by NREL are analyzed with hub-height wind data, full field turbulent wind data and Airfoil data. The interface to perform coupled analysis between AeroDyn and DAFUL, GUI for modeling several parts of wind turbines are developed. The program will be extended to analyze the coupled analysis of aerodynamic and hydrodynamic behavior for floating offshore wind turbines.
임채환(Chae Whan Rim),윤병현(Byung Hyun Yun),박성환(Seong Whan Park) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
To estimate welding residual stress distribution, measurement and calculation were done for 2 types of model, thin and thick plates. The residual stress around the welding bead was measured with Barkhausen method. For the numerical calculation commercial program ANSYS was used. The results of measurement and calculation show that Satoh's formula for calculating residual stress of butt weld estimates longer distance of the location of maximum compressive stress and wider range of residual stress zone. According to the results a formula modifying Satoh's for estimating the residual stress of butt welding was proposed.
On the prediction of global first-year ice loads
Chae-Whan Rim(임채환) 한국해양공학회 1997 韓國海洋工學會誌 Vol.11 No.3
A model and associated computer program was developed for a deterministic prediction of global first-year ice loads on offshore structures. The load caused by a ridge consists of load components arising from a consolidated layer, a rubble pile that develops in front of the structure and of the ridge keel. The ridge keel is considered as a layered accumulation of ice rubble, below the consolidated layer. The uppermost layer of the ridge keel can have a high apparent cohesion strength, due to ice blocks that are partially frozen into the consolidated layer.<br/> A soil mechanical approach is used to simulate the changes in the keel profile when a structure penetrates the ridge. Both vertical and inclined structures can be considered by the present model.<br/> A parametric study was made to determine how some of the uncertainties of the input parameters influence the global load evaluation. Therefore, it should be appreciated that the example calculations shown above do not represent actual ice load predictions for the example structure considered. It was found that the present lack of knowledge about the internal friction angle of the ridge keel represents a major source of uncertainty in ice load prediction. The computations also showed that the layered structure of the ridge keel may influence the keel load component considerably. The frictional resistance that develops at the rubble/structure contact area causes an increase in the ice load. The inclination of the structure has the same effect if the ice wall forces the ice rubble upwards during ridge penetration.
Introduction to the NREL Design Codes for System Performance Test of Wind Turbines
방제성(Bang, Je-Sung),임채환(Rim, Chae Whan),정태영(Chung, Tae Young) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
NREL NWTC Deside codes are analyzed and introduced to develop the system performance simulation program for wind turbine generator systems. In this paper, The AirfoilPrep generating the airfoil data, the IECWind generating hub-height wind data with extreme condition following IEC 61400-1, the TurbSim generating stochastic full-field turbulent wind data, the PreComp calculating structural and dynamic properties of composite blade and the BModes making mode shapes of blade and tower are explained respectively.
풍력발전시스템의 유연체 다물체 동역학 시뮬레이션 프로그램 개발
송진섭(Song, Jin-Seop),임채환(Rim, Chae-Whan),남용윤(Nam, Yong-Yun),배대성(Bae, Dae-Sung) 한국신재생에너지학회 2011 신재생에너지 Vol.7 No.4
A wind turbine simulation program for the coupled dynamics of aerodynamics, elasticity, multi-body dynamics and controls of turbine is newly developed by combining an aero-elastic code and a multi-body dynamics code. The aero-elastic code, based on the blade momentum theory and generalized dynamic wake theory, is developed by NREL(National Renewable Energy Laboratory, USA). The multi-body dynamics code is commercial one which is capable of accounting for geometric nonlinearity and twist deflection. A turbulent wind load case is simulated for the NREL 5-MW baseline wind turbine model by the developed program and FAST. As a result, the two results agree well enough to verify the reliability of the developed program.