STUDY ON MOTION CHARACTERISTICS OF TOWING A SPAR TYPE FLOATING BODY USING HYDRAULIC EXPERIMENT

Abstract

 Hydraulic model experiments were conducted to understand the characteristics of the motion of a spar-type floating tow under the action of transverse waves and during turning in the construction of a floating spar-type offshore wind turbine. In the case of towing under the action of transverse waves, the amount of roll motion tended to increase with longer period waves and higher towing speeds. In the turning towing experiment, we confirmed that the spar rolled outward significantly due to centrifugal force when the turning radius was small in relation to the towing speed, and evaluated the towing speed and turning radius during construction. In addition, we focused on the difference depending on whether an auxiliary towing tug is used or not, and confirmed that in the case without an auxiliary tug, the wave drift force becomes large when the wave period is small, and therefore, the tug cannot turn the head. Therefore, the necessity of an auxiliary tug for turning towing construction was confirmed.