長大浮体の方向スペクトル波中弾性応答及び係留系の挙動

概要

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The hydroelastic response of a large and long floating offshore structure moored in short-crested waves by tensioned tether buoys is studied in this paper. The applied model is a psuedo-elastic body by connecting each rigid unit part at deck with elastic members. The main concern of this paper is the distribution of vertical displacement in short-crested waves.Firstly, the deflections of deck part among regular waves are calculated based on the method of combination of modal analysis and hydrodynamic force analysis and the results are compared with measured values at multi-points. The deflections in short-crested waves are discussed through experimental results and theoretical preditions. The response spectra and distributions of variance of vertical displacement along centerline of structure are shown for both long and short-crested waves and the influence of flexibility on deflection has been discussed.In addition, motion of TL-buoy and tether tention in case of single buoy and the buoy moored to structure are investigated. Finally, the interactions between buoy and structure are discussed from the view point of realization of mooring system for large and long floating offshore structure.
社団法人日本船舶海洋工学会の論文