Gravity Dynamometerによる波浪中抵抗試驗及びSurgingについて

概要

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In measuring ship's resistance in waves, the method of connecting the model to the dynamometer is found to be a difficult matter. If they were connected rigidly, the dynamometer would be acted by a force over ten times the mean resistance of the model, and if springs were put there as a buffer, the naturo 1 period of the system might become so long as to synchronize with the period of the waves. The Author thinks the gravity dynamometer method, that has been used at the Hamburg experimental tank, and which was suggested to be used at the Sixth International Conference of Ships Tank Superintendents, is a very clever method, because it allows ship to surge freely, and satisfies the condition of constant thrust. An experiment was done at the experimental tank of Tokyo Univercity with a model of the S. S. Nisseimaru. Two devices, one for recording the motion of the model thereby making it possible to measure the mean speed and the surging of the model, and the other for eliminating the effect of accerelation of the weight by reducing the ratio of pulleys, were made at the experiment.
社団法人日本船舶海洋工学会の論文