Abstract
Many aqua robots are in practical use to investigate various aquatic animals. Caudal-fin-driven robotic fish that imitate live fish do not alarm other underwater creatures. Moreover, because such robotic fish do not use a screw propeller, they are unlikely to be entangled with water plants. In this study, two-joint robotic fish have been constructed with servo motor to speed up. To compare for the results of PIV experiments and CFD analysis then evaluate the differences of the propulsion performance by changing the phase difference. It can be confirmed that the angle of the tail fin tip and is related to the angle spread of the vortex. This robot was able to swim like live fish.
