スラミングによる小型船の船底損傷について

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The structural damage, speed loss and hull shudder done by slamming are serious problems in seaworthiness of a ship. Investigations of slamming mechanism, impact pressure and prevention method of damage of large ship have been made and the rules of the classification societies has been suitably revised. Nevertheless, structural damage due to slamming are still reported. The slamming damage of bottoms of small ships are specially characterized of larger domain spreading to the midship, and of larger amount of push-up of the whole structure of bottom, compared with large ship of which the damage is of shell panel surrounded by the longitudinal and transverse girders. The slamming impacts are computed from the structural damage of the whole bottoms of five small ships and it is found that the whole structures of single bottoms of small ships are weak as compared with the double bottoms of large ships. The computation is based on the energy method of statical elastic theory. The other characteristic feature of larger domain of the slamming damage is originated in the larger value of speed length ratio. The pitching and heaving amplitudes of ships are calculated with the approximate formulas proposed by Prof. Tasai, and the normal and oblique impact pressures classified by Dr. Watanabe are calculated on the eight damaged ships. If the small ships is operated without speed loss, the pitching or heaving amplitudes of them are larger than the large ships, and then these facts may be the other characters of large slamming damage of small ships. The characteristics of the slamming damage of bottoms of small ships are clarified by these calculations.
社団法人日本船舶海洋工学会の論文
1967-02-28

スラミングによる小型船の船底損傷について

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