船舶の波浪時接岸力に関する研究

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In recent years, sea-berth has been constructed gradually off shore to keep the water depth of berth according to the growing size of ships, and then it has become difficult to keep calm in berth. Therefore, the studies of berthing force of ships in water wave have been very important. One of the authors has studied berthing force of ships in still water and has found the calculating method to estimate the berthing force of ships. This calculating method has been proved by the in situ measurements of berthing force of supertanker on dolphin. The study of berthing force in water wave is carried out on the basis of the results of those in still water. In this paper, the authors present the results of the model test and the analysis for the berthing force of ships in beam sea, which consist of two main parts, one is drifting velocity and the other berthing force of ships. The principal results of this studies are as follows; 1) For convenience, the pressure acting on the side of hull can approximately calculated by use of the theory of clapotis of Airy's wave. 2) The ratio of the wave pressure acting on the forward side of ship to that acting on the opposite side is from 0 to 0.4. 3) The drifting velocity consists of two parts, that is, the constant velocity due to the wave pressure and the wave current, and the cyclic velocity due to the wave. 4) The maximum berthing force may be obtained by the equation F_<max> = K(X_<c max> + X_<f max>), where, K is the elastic coefficient of fender, X_<c max> and X_<f max> are the maximum displacement due to constant velocity and due to cyclic velocity respectively.
独立行政法人海上技術安全研究所の論文
1976-07-15

船舶の波浪時接岸力に関する研究

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