Research on piezoelectric direct-drive bionic fin and its high-frequency drive

Bionic fish is a common underwater robot, which has great significance for human beings to explore the ocean. However, with the development of underwater operations to deeper and narrower areas, higher requirements are put forward for the small size and high anti-pressure ability of bionic fish. Aiming at the above problems, in this work, we consider the excellent performance of piezoelectric materials and propose a bionic fin driving unit directly driven by piezoelectric ceramic. It can work in 10 MPa high hydrostatic pressure environment (About 1000 m water depth). It does not require pressure resistant equipment and does not need amplification device. We carry out the fluid-solid coupling analysis to reveal the driving mechanism of the high-pressure pulsating pressure. The influence of the geometric parameters of the driving unit on the driving performance is studied, the anti-pressure ability and the motion ability of the bionic fish is verified. Experiments results show that its velocity can reach 2.2 BL/s, and it can work normally under 10 MPa water pressure.