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Offshore Structure Design in an Ice Environment
Chul H. Jo(조철희) 한국해양공학회 1991 韓國海洋工學會誌 Vol.5 No.2
현대사회의 급증하는 에너지 소비 증가로 최근 북극의 개발이 가속되고 있지만, 지역의 특성으로 인하여 천연 자원의 개발에 많은 어려움을 겪고 있다. 그 지역에 설치될 해양구조물의 설계에 고려되어야 하는 가장 중요한 요소는 빙하에 의한 충격과 저항이다.<br/> 이 논문에서는 수직 해양구조물 및 경사 구조물에 작용하는 빙력산출법들을 소개하고 비교하였다. 또한 그 취약지역에 설계되고 있는 해양 구조물의 종류와 그 장단점을 비교하고, 설계상 꼭 고려되어야 할 사항들을 제시하였다.
Numerical and Experimental Studies of Dual Subsea Pipelines in Trench
Jo, Chul H.,Shin, Young S.,Min, Kyoung H. The Society of Naval Architects of Korea 2002 Journal of ship and ocean technology Vol.6 No.2
Offshore pipelines play an important role in the transportation of gas, oil, water and oil products. It is common to have a group of pipelines in the oil and gas field. To reduce the installation cost and time, dual pipelines are designed. There are great advantages in the installation of dual pipelines over two separate single lines. It can greatly reduce the cost for trench, back-filling and installation. However the installation of dual pipelines often requires technical challenges. Pipelines should be placed to be stable against external loadings during installation and design life period. Dual pipelines in trench can reduce the influence of external forces. To investigate the flow patterns and forces as trench depth and slope changes, number of experiments are conducted with PIV(Particle Image Velocimetry) equipment in a Circulating Water Channel. Numerical approaches to simulate experimental conditions are also made to compare with experimental results. The velocity fields around dual pipelines in trench are investigated and analysed. Comparison of both results show similar patterns of flow around pipelines. It is proved that the trench depth contributes significantly on hydrodynamic stability. The trench slope also affects the pipeline stability. The results can be applied in the stability design of dual pipelines in trench section. The complex flow patterns can be effectively linked in the understanding of fluid motions around multi-circular bodies in trench.
Design Load Analysis of Current Power Rotor and Tower Interaction
Jo, Chul H.,Lee, Kang-Hee,Hwang, Su-Jin,Lee, Jun-Ho Korean Society of Ocean Engineers 2013 International journal of ocean system engineering Vol.3 No.4
Tidal-current power is now recognized as a clean power resource. The turbine blade is the fundamental component of a tidal current power turbine. The kinetic energy available within a tidal current can be converted into rotational power by turbine blades. While in service, turbine blades are generally subjected to cyclic fatigue loading due to their rotation and the rotor-tower interaction. Predicting the fatigue life under a hydrodynamic fatigue load is very important to prevent blade failure while in service. To predict the fatigue life, hydrodynamic load data should be acquired. In this study, the vibration characteristics were analyzed based on three-dimensional unsteady simulations to obtain the cyclic fatigue load. Our results can be applied to the fatigue design of horizontal-axis tidal turbines.