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초기 조건이 부유식 풍력터빈 동역학 해석의 과도응답에 미치는 영향
송진섭(Jin-Seop Song),임채환(Chae-Whan Rim),문석준(Seok-Jun Moon),남용윤(Yong-Yun Nam) 한국해양공학회 2014 韓國海洋工學會誌 Vol.28 No.4
The IEC standard for onshore or offshore wind turbines requires additional dummy simulations (at least 5 s) for the transient responses due to initial conditions. An increase in the dummy time causes a considerable increase in the computational cost considering multiple design spirals with several thousand design load analysis cases. A time of 30 s is typically used in practical simulations for a wind turbine design with a fixed platform. However, 30 s may be insufficient for floating offshore wind turbines (FOWT) because the platforms have lower natural frequencies, and the transient responses will last much longer. In this paper, an initial condition application algorithm is implemented for Wind Hydro, and the appropriate dummy simulation time is investigated based on a series of dynamic simulations of a FOWT. As a result, it is found that more than 300 s is required for the platform to have stationary motion after the initial transient responses for the FOWT under the conditions considered.
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.
송진섭(Jin-Seop Song),이근호(Geun-Ho Lee),박영준(Young-Jun Park),배대성(Dae-Sung Bae),이철호(Chul-Ho Lee) 한국생산제조학회 2012 한국생산제조학회지 Vol.21 No.1
Dynamic as well as static and geometric design parameters such as inertia, tooth profile, backlash and clearance can be directly considered via multi-body dynamic analysis along with contact analysis. However, it is time consuming to use finite elements for the consideration of the tooth flexibility in the multi-body dynamic analysis of gears. A computationally efficient procedure, so called, Gear Stiffness Module, is suggested to resolve this calculation time issue. The characteristics of gear tooth compliance are discussed and rotational stiffness element concept for the Gear Stiffness Module is presented. Transmission error analyses for a spur gear system are carried out to validate the reliability and efficiency of the module. Compared with the finite element model, the Gear Stiffness Module yields considerably similar results and takes only 3% of calculation time.
굴삭기 작업장치부의 거동에 따른 선회시스템 동적 특성 연구
문상곤 ( Sang-gon Moon ),( Ja-ho Seo ),송진섭 ( Jin-seop Song ),김용래 ( Yong-rae Kim ) 한국농업기계학회 2016 한국농업기계학회 학술발표논문집 Vol.21 No.2
굴삭기는 건설장비 중 대표되는 장비로 현장에서 굴삭, 평탄, 덤핑 작업 등에 이용되며, 상부선회체, 하부주행체, 작업장치로 구성된다. 특히 굴삭기 선회시스템에서는 작업장치의 자세, 버켓 적재량에 따라 질량관성모멘트가 변하여 선회 속도와 회전 변위에 영향을 미치므로 정확한 거동 분석이 중요하다. 본 연구는 굴삭기 거동에 따른 선회시스템의 동적 특성 고찰을 통해 선회부의 속도, 가속도, 마찰력을 도출하였다. 선회시스템은 선회 시 질량관성모멘트, 가속도, 선회 속도, 선회 토크와 마찰력으로 정의되며, 동역학 시뮬레이션에서 구속 조건과 관계식을 적용하여 모델링하였다. 개발됨 모델링을 기반으로 대표 상차작업동안 변화되는 굴삭기 선회시스템의 동적 특성의 변화를 분석하였다.
박영준(Young-Jun Park),이근호(Geun-Ho Lee),김정길(Jeong-Kil Kim),송진섭(Jin-Seop Song),박성하(Sung-Ha Park) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.6
Most of pitch/yaw reducers consist of several planetary geartrains. Planetary geartrains make gearboxes to be small and light, low noise and good efficiency. Most important thing in the planetary geartrain is load distribution on the gear tooth flank. In this study, the effect of output shaft bearings on the load distribution of gear tooth flank has been investigated. The commercial software was employed to compare the load distribution of two models depending on the bearing type. The spherical roller bearing(SRB) and the cylindrical roller bearing(CRB) were used as output shaft bearings in the 1<SUP>st</SUP> model, and two taper roller bearings(TRB) were used in the 2<SUP>nd</SUP> model. As a result, it was found that the 2<SUP>nd</SU> model. showed better performances on the load distribution of gear tooth flank, this results stated that the output shaft bearing system could be important consideration when designing reducers for wind turbine systems.