In this paper, the mechanism of the underwater fish-like robot, which is controlled by the giant magnetostrictive material actuator, is studied. A mechanical model of the robot is presented based on the relationship between the driving force and frequencies, which is controlled by external magnetic fields. At the same time, a new design project is given by optimizing structures and a two-tail fish-like robot is devised, in which the robot can swim directly forward and backward.
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