Study on Wear Estimation and Wear Reduction of the Floating Offshore Wind Observation System "Buoy Lidar"

Abstract

　In this study, a wear amount estimation method is investigated using the data obtained from the 2^nd Demonstration Experiment of the wind observation system off the coast of Sakata, the floating platform including the mooring system to reduce wear is optimized by using the estimation method. First, the wear condition of the mooring lines is investigated and it is found that the wear amount at the mooring point on the buoy side is the largest. Next, the cause of the higher progress wear than the expected design speed is investigated by numerical calculations, and it is confirmed that the proportionality constant in the wear evaluation formula proposed by Takeuchi et al. is changed according to the sea conditions, and the proportionality constant in the equation is determined. Finally, the floating platform including the mooring system is optimized by using the proposed method to reduce the wear amount of the mooring line, it is found the wear amount can be reduced by adjusting the length of the mooring line or the reduction of buoy weight