Abstract
Fish robots that swim with the tail fin do not give the caution to underwater creatures. Therefore, they become useful for the investigation of ecosystem in water and the usage of the environmental surveillance and so on. However, the propulsive velocity of fish robots is extremely slower than that of live fishes. Therefore, in this study, we aim to improve the propulsive performance of fish robot. The fish robot is made for trial purposes. Then, the effects of supply voltage, tail fin flexibility and operating frequency on propulsive performance in the fish robot have been examined. The fish robot has swum fast at high supply voltage, and has swum efficiently at low voltage. Moreover, it has been confirmed that the fish robot swims very fast when the fin flexibility and frequency are appropriate and the tail fin motion is similar to that of a live fish.
