6. A Study of Wave-Induced Vibrations

概要

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Wave-induced vibrations (springing) have been studied both theoretically and experimentally. The model experiments have been carried out using a tanker model of 7 meter length. Higher harmonic excitation in regular waves and the response to it have been confirmed. It has been shown that the natural frequency of the 2-noded hull vibration and the ship speed play an important role in the response of springing. Also model experiments in irregular waves have been carried out. Full scale experiments of springing on board large tanker have been performed. Using the these results, characteristics of springing have been examined. Expressions for combined stress are shown. Short-term and long-term distributions of springing stress are also presented. It is shown that the combined stress is less than the sum of wave bending and springing stresses. The extreme value for 20 years of springing stress of 237000 dwt tanker is estimated about 4 kg/mm^2.
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