자유롭게 매달린 라이저의 가진방향 거동 특성에 관한 실험 연구

Abstract

In this study, model tests were performed on the response characteristics of a free-hanging riser. The aspect ratio(L/D) of the experimental model is 700. We focused on the in-line responses under forces oscillation conditions. The model tests were performed at Ocean Engineering Basin of KRISO. The test cases were determined by modal analysis with OrcaFlex. The mode shape was reviewed from 1st to 4th modes. The in-line responses along the riser length were compared with results of the time-domain analysis. The responses were directly plotted in time series and investigated in statistical values. The discussion is made on the effects of the oscillation period, drag coefficient and higher mode responses.