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유압구동식 레이돔 개폐장치 CFD 공력해석 및 구조해석
정대하(Dae-Ha Jeong),서민수(Min-Su Seo),김동현(Dong-Hyun Kim),최희주(Hui-Ju Choi),김은종(Eun-Jong Kim),강동언(Dong-Eon Kang) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.5
In this study, aerodynamic and structural analyses have been conducted for radome switchgear. In order to analyze wind load under the operating conditions such as opened radome with different angles and wind speeds. The computational fluid dynamics (CFD) based on Reynolds averaged Navier-Stokes equation with emphasized the k-? sst transitional flow turbulence model has been used. And the finite element method (FEM) for structural stress analysis has been conducted to consider self weight and wind load which obtained. As a detailed results, stress distributions are presented under various conditions.
GL 2010 기반 대형 풍력터빈 드라이브트레인 시스템 다물체 동역학 해석기법
정대하(Dae-Ha Jeong),김동현(Dong-Hyun Kim),김명환(Myung-Hwan Kim) 한국소음진동공학회 2014 한국소음진동공학회 논문집 Vol.24 No.5
In this study, computational multi-body dynamic analyses for the drivetrain system of a 5 ㎿ class offshore wind turbine have been conducted using efficient equivalent modeling technique based on the design guideline of GL 2010. The present drivetrain system is originally modeled and its related system data is adopted from the NREL 5 MW wind turbine model. Efficient computational method for the drivetrain system dynamics is proposed based on an international guideline for the certification of wind turbine. Structural dynamic behaviors of drivetrain system with blade, hub, shaft, gearbox, supports, brake disk, coupling, and electric generator have been analyzed and the results for natural frequency and equivalent torsional stiffness of the drivetrain system are presented in detail. It is finally shown that the present multi-body dynamic analysis method gives good agreement with the previous results of the 5 ㎿ class wind turbine system.