VLCC船型に作用する波浪変動圧力の特性とその長期予測について

概要

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There has been hot discussions on the characteristics of wave-induced pressure fluctuation on the side shell of VLCCs, since considerable number of fatigue cracks were found on side-longitudinals of second generation VLCCs. In Japan, it was mainly dealt with by SR-216 Panel, where a full-scale measurement on a typical second generation VLCC, tank experiments on a scaled model and theoretical investigations were carried out. The main themes of the discussion seem to be whether characteristics of pressure fluctuation is predictable even for small values of wave-length to ship-length ratio like 0.1-0.3 and how peak-to-trough value can be obtained of wave-induced pressure fluctuation on the side shell close to the load-water-line.Tank experiments on a scaled-model ship were carried out at Nagasaki Experimental Tank of Mitsubishi Heavy Industries to answer the questions, and it is shown that measured results agree with calculated results by strip method after a simple correction on non-linearity effect caused by the crossing of free-surface. Results of long-term prediction with the same correction also show good agreements with the results of the full-scale measurements.
社団法人日本船舶海洋工学会の論文