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계류장치 연결 위치가 Spar Type 부유식 해상풍력 발전기의 동적 응답에 미치는 영향 해석
조양욱(Cho, Yanguk),조진래(Cho, Jinrae),정의봉(Jeong, Weuibong) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.5
This paper deals with the analysis of dynamic characteristics of mooring system of floating-type offshore wind turbine. A spar-type floating structure which consists of a nacelle, a tower and the platform excepting blades, is used to model the floating wind turbine and connect three catenary cables to substructure. The motion of floating structure is simulated when the mooring system is attached using irregular wave Pierson-Moskowitz model. The mooring system is analyzed by changing cable position of floating structure. The dynamic behavior characteristics of mooring system are investigated comparing with cable tension and 6-dof motion of floating structure. These characteristics are much useful to initial design of floating-type structure. From the simulation results, the optimized design parameter that is cable position of connect point of mooring cable can be obtained.
마찰 에너지 해석을 통한 러버 트랙(Rubber Track)의 마모율 예측
강종진(Jongjin Kang),조진래(Jinrae Cho),정의봉(Weuibong Jeong) 한국자동차공학회 2011 한국 자동차공학회논문집 Vol.19 No.5
The wear of rubber track being in contact with the road surface is an important subject because it decreases the traction performance and the operating efficiency of tracked vehicle. For the above reasons, many attempts have been made to quantitatively calculate the rubber track. However, it depends on the experimental methods which are highly time- and cost-consuming. Therefore, the numerical simulation approach is highly desirable, but it needs to model the complex geometry and the material behavior in details as well as the interaction with the road surface. In this study, the rubber track and its material behavior are elaborately modeled since these factors are very important in the prediction of the wear rate of the rubber track. Accordingly to the studies on the rubber wear by previous investigations, it has been found that the wear is greatly influenced by the frictional energy. The frictional energy of rubber track is computed by utilizing the 3D finite element analysis of the rubber track, and the wear rate is evaluated making use of the frictional energy and a wear model.
이홍우(Hongwoo Lee),조진래(Jinrae Cho),유완석(Wansuk Yoo) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Recently, the natural element method (NEM) based on the natural neighbors and the Bubnov-Galerkin approximation is being explored as a possible solution to the common defects of meshfree methods, the enforcement of essential boundary condition and the numerical integration. In which, Laplace interpolation functions defined using the Voronoi diagram and the Delaunay triangulation are used for both trial and test basis functions. And, the numerical integration is carried out with the help of the background cell. This paper intends to explore the application of NEM to the 2-D static tire contact problem characterized by the large and almost incompressible deformation.
부유식 해상풍력발전기의 자세제어장치 개발을 위한 환형 실린더 탱크의 슬로싱 실험
서명우(Seo, Myeongwoo),정의봉(Jeong, Weuibong),조진래(Cho, Jinrae) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.1
The floating offshore wind turbines are usually exposed to the wave and wind excitations which are irregular and undirected. In this paper, the sloshing characteristics of annular cylindrical tank were experimentally investigated to reduce the structural dynamic motion of floating offshore wind turbine which is robust to the irregular change of excitation direction of wind and wave. The formula for the natural sloshing frequencies of this annular cylindrical tank was derived theoretically. In order to validate this formula, the shaking equipment was established and frequency response functions were measured. Two types of tank were considered. The first and second natural sloshing frequencies were investigated according to the depth of the water. It has been observed that between theoretical and experimental results shows a good agreement.
최주형(Joohyoung Choi),전도형(dohyoung Jeon),조진래(Jinrae Cho),김기전(Gijeon Kim),우종식(Jongshik Woo) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper is concerned with the braking distance estimation of tire operated with ABS (Anti-lock Braking System). The frictional heat dissipation at disc pad is derived analytically, and the tire frictional energy loss is computed by utilizing the 3-D dynamic rolling analysis of tire. Dynamic rolling analysis during entire braking time period is impratical, so that this study divides the vehicle velocity by 10km/h to reduce the analysis time. The multiplication of the slip rate and the shear stress provides the frictional energy rate. Using frictional energy rate, total braking distance is estimated
타이어의 그루브 폭에 따른 젖은 노면에서의 제동특성 연구
손정삼(Jungsam son),이홍우(Hongwoo Lee),조진래(Jinrae Cho),김기전(Gijeon Kim),우종식(Jongshik Woo) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
When a vehicle is running rapidly on the wet-road, the tire contact force decreases because of the occurrence of thin water film between road and tire. In the severe case, tire may float over the road slide on the road. this phenomenon is called "hydroplaning". Hydroplanning is seriously influenced by road property, internal pressure, the vehicle velocity, the tread pattern, and so on. In this paper, the width of tire-groove among several factors is considered and 3 groove models are applied. The rolling analysis of tire is performed by MSC/Dytran.