Abstract
As a novel underwater observation and detection platform, the underwater glider generally changes its net buoyancy with the buoyancy adjustment system to complete the descending and ascending motions and therefore realize the observation and detection of the ocean environment. This study designs a new buoyancy actuator based on the deformation mechanism of shape memory alloy (SMA) to achieve a buoyancy adjustment system with better accuracy. The thermodynamic model of the proposed actuator is established, and its driving characteristics are obtained by finite element simulation under electro-thermal-mechanical coupling. Finally, experiments are performed to verify the rationality of the design process and the effectiveness of the SMA buoyancy actuator. The design method of the SMA buoyancy actuator also provides a reference for the propulsion of other underwater vehicles applied in shallow waters.
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