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스마트 무인기 지상시험장치의 다물체 동역학 및 구조진동해석
박강균,김동현,김동만,최현철,안오성,Park, Kang-Kyun,Kim, Dong-Hyun,Kim, Dong-Man,Choi, Hyun-Chul,Ahn, Oh-Sung 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.1
In this study, computational multi-body dynamics and structural vibration analyses including some impact condition have been conducted for the ground flight test system of the developed smart UAV model. Designed ground test system has four degree-of-freedom motions with limited motion control mechanism. Design safety margin designs for several structural components are tested and verified considering expected critical motions (pitching and rolling) of the test smart UAV model. Computational results for various analysis conditions are practically presented in detail. Futhermore, proper design modifications of the initially designed test equipment in order to guarantee or increase structural safety have been successfully conducted in the design stage.
지진 기반가진조건에 대한 대형 풍력발전기 타워의 동적응답 해석
박강균(Kang-Kyun Park),김동만(Dong-Man Kim),이종욱(Jong-Wook Lee),최현철(Hyun-Chul Choi),김동현(Dong-Hyun Kim),김수현(Su-Hyun Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Modem wind turbines have been mainly erected in region where earthquake are rare or normally weak, especially Korea was thought as safety zone from earthquake. But recently, the earthquake occurs more and more frequently thus the wind turbine design is required for the structural and functional stability under the earthquake. The earthquake can influence normal operation, even if a weak earthquake. There are two ways to review the design under earthquake using Computer Applied Engineering (CAE). One is the Response Spectrum Analysis (RSA) the other is Time History Analysis (THA). In this research, dynamic response on time is obtained under the earthquake by taking into account ground accelerogram consistent with the relevant standards applied to the turbine foundation.
김동만,김동현,박강균,최현철,Kim, Dong-Man,Kim, Dong-Hyun,Park, Kang-Kyun,Choi, Hyun-Chul 한국생산제조학회 2010 한국생산제조학회지 Vol.10 No.6
In this study, advanced computational technique for mechatronic analysis has been developed for the efficient design and test of typical machine tool models. Flexible multi-body dynamic (FMBD) analysis method combined with motion controller including control logics is used to simulate typical operation conditions. The present FMBD machine tool model is composed of flexible column structure, rigid body spindle, vertical motion guide (arm) and screw elements. Driving motor clement with rotating degree-of-freedom is interconnected and governed by the designed Matlab Simulink control logic, and then the position of the spindle is feedback into the control logic. It is practically shown from the results that the investigation of designed machine tools with controller can be effectively conducted and verified.
풍하중 효과를 고려한 MW급 풍력발전기 타워의 지진응답 해석
최현철,김동현,김동만,박강균,Choi, Hyun-Chul,Kim, Dong-Hyun,Kim, Dong-Man,Park, Kang-Kyun 한국전산구조공학회 2010 한국전산구조공학회논문집 Vol.23 No.2
본 논문에서는 CFD와 FEM에 기초한 진보된 전산해석 기법을 적용하였고 지진에 의한 수평 및 수직방향 기반가진 및 풍하중 효과를 동시에 고려하여 MW급 풍력발전기의 지진응답 해석을 수행하였다. 본 연구에서는 실용적인 응답특성 파악을 위해 시간영역 수치해석기법을 적용하였으며, 지진기반하중 및 풍하중에 의한 영향을 상호 비교하였다. 본 연구의 결과를 통해 관성 특성이 매우 큰 초대형 풍력발전기가 정상작동 조건 중 지진이 유발되는 경우가 타워에 유발되는 응력특성에 큰 영향을 미칠 수 있기 때문에 중요하게 고려될 필요성이 있음을 알 수 있었다. In this study, seismic response analyses of a MW class wind-turbine have been conducted considering applied wind-loads using advanced computational method based on CFD and FEM. Typical lateral and vertical acceleration levels induced by earthquake is also considered herein. Practical numerical method for seismic response analysis of wind-turbine tower models are presented in the time-domain and the effects of wind load and seismic excitation for responses are compared to each other. It is importantly shown that possible earthquake effect during typical operating conditions should be taken into account in the design of huge wind-turbine tower systems because of its enormous inertia characteristics for induced maximum stress level.
3차원 회전 블레이드에 대한 정적/동적 유체-구조 연계해석
김동현(Dong-Hyun Kim),김유성(Yu-Sung Kim),김동만(Dong-Man Kim),박강균(Kang-Kyun Park) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In this study, static/dynamic fluid-structure interaction analyses have been conducted for a 3D rotary blade model like a turbo-machinery or wind turbine blade. Advanced computational analysis system based on computational fluid dynamics (CFD) and computational structural dynamics (CSD) has been developed in order to investigate detailed dynamic responses of rotary type models. Fluid domains are modeled using the computational grid system with local grid deforming techniques. Reynolds-averaged Navier-Stokes equations with various turbulence model are solved for unsteady flow problems of the rotating blade model. Detailed static/dynamic responses and instantaneous pressure contours on the blade surfaces considering flow-separation effects are presented to show the multi-physical phenomenon of the rotating blades.
회전 및 풍하중 가진 효과를 고려한 대형 풍력발전 로터의 효율적인 슈퍼요소 구조진동해석
김동만(Kim, Dong-Man),김동현(Kim, Dong-Hyun),박강균(Park, Kang-Kyun),김유성(Kim, Yu-Sung) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.7
In this study, computer applied engineering(CAE) techniques are fully used to efficiently conduct structural and dynamic analyses of a huge composite rotor blade using super-element. Computational fluid dynamics(CFD) is used to predict aerodynamic loads of the rotating wind-turbine blade. Structural vibration analysis is conducted based on the non-linear finite element method for composite laminates and multi-body dynamic simulation tools. Various numerical results are presented for comparison and the structural dynamic behaviors of the rotor blade are investigated herein.