Self-propelled Swimmer Propulsion System using SAW and BAW

Many researches on self-propelled swimmer actuators using ultrasonic vibrators have been discussed with acoustic streaming. However we suggest that this is due to the acoustic radiation force caused by the acoustic impedance difference. In this research, we make two kinds of swimmers using surface acoustic wave (SAW) that generates 9.6MHz Rayleigh wave and bulk acoustic wave (BAW) that generates 1.6MHz Bulk wave, and compare the thrust of swimmers calculated acoustic radiation force from vibration velocity and measure using digital force gauge. The results show that the order of thrusts of SAW and BAW are much different. The movement of the interface between the ultrasonic transducer and the liquid is required to discuss more strictly.