An Experimental Method for Analysis of the Dynamic Behavior of Buoys in Extreme Environment

J. Ocean Eng. Technol. 2001;15(3):134-141.

Hong Gi Yong,Yang Chan Gyu,Choe Hak Seon

극한 환경하의 부표 운동성능 모형시험기법 개발

홍기용,양찬규,최학선

한국해양연구원 해양개발시스템연구본부,한국해양연구원 해양개발시스템연구본부,한국해양연구원 해양개발시스템연구본부

Keywords: Buoy motion, Mooring tension, Extreme environment, Model test, Model similarity

핵심용어: 부표운동, 계류삭 장력, 극한환경, 모형시험, 모형 상사성

Abstract

An experimental method to investigate the dynamic characteristics of buoys in extreme environmental condition is established. Because the buoy model requires a resonable size for accurate experiment, the test condition in model basin that satisfies the similarity law is hardly compatible with capability of test facilities. It is suggested that the linear wave component that is unable to satisfy similarity is separated with others. The model experiment is carried out with mitigated condition for the linear wave components while others including wave drift, current and wind are keeping the similarities. Then, the result can be extrapolated to give the dynamic behavior of buoys n extreme condition because linear wave component is solely responsibly to oscillatory buoy motion and other environmental components are applied as a initial tension. The similarity for current and wind conditions is viewed as equivalence of restoring forces. The validity of proposed method is examined with different types of standard ocean buoys and it indicates that the linearity of measured characteristics is assured with a limitation of resonable distance between test and estimated wave conditions.