関節イルカ形水中推進機構の動力学解析 : 第4報, 月形尾びれを有するモデルの解析

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This paper describes a numerical study of dynamics and efficiency of a two-joint bending propulsion mechanism that is composed of a streamlined body and a caudal fin. We used the quasivorrtex-lattice-method in order to analyze the lunate caudal fin, comprising the slender body theory for the body. Firstly, we examined the characteristics of the propulsive efficiency of various types of the caudal fins only. It was found that the propulsive efficiency of three dimensional analysis becomes lower than that of two-dimensional analysis and that large swept angle causes reduction of the propulsive efficiency. Next, we investigated the characteristics of the propulsive efficiency of the whole mechanism including the effect of the body. The propulsive efficiency of the whole mechanism exhibited similar tendency to that of caudal fin only, although the propulsive efficiency of the whole mechanism becomes lower than that of caudal fin only, especially at low reduced frequency. Finally, by comparing the calculated results with some observed data of dolphin, it was found that the optimum motion parameters, which gives the highest propulsive efficiency, agree well with the dolphin's motion parameters.
一般社団法人日本機械学会の論文
1999-01-25