Abstract
This chapter investigates the hydroelastic response characteristics of a pontoon type floating structure in waves with an ocean engineering model basin test with the scale ratio of 1/20 of the first phase pontoon of the Mega-Float project in Japan. Vertical motions and bending moments were measured using potentiometers and strain gages, respectively in regular waves. The response-dependence on the water depth was investigated by the comparison with the other existing experimental results. The hydroelastic response of a pontoon type floating structure decreases as water depth becomes shallow, which can be explained by the decreased wave exciting pressures and the increased added mass effects of the surrounding water with decreasing water depth. This was confirmed by the wetted vibration analysis using the finite element method. The vertical displacement RAO has the largest value at the stem and becomes smaller, and has the smallest value at the central part and becomes lager again at the stem part. The vertical displacement RAO increases with the increase of wavelengths and decreases in general with the decrease of water depths.
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