Research of an accurate buoyancy adjusting method of underwater glider based on temperature compensation

Underwater glider is developed for the application of marine variables observation by changing the net buoyancy as a driving force. It has many advantages, such as gliding with high efficiency, less power consumption, low noise, no pollution and so on. An accurate buoyancy adjusting method which used for underwater glider based on the volume change of interior gas is introduced in this paper. Besides, the buoyancy adjusting system using this method of the self-developed OUC underwater glider is described in detail. And we obtain the relation among the volume of external bladder, interior gas pressure and temperature by a measurement experiment. Finally, the comparative experiment between the interior calculation and the actual measurement of the volume of external bladder is performed simultaneously. The experimental results show that the buoyancy of glider can be accurately measured by the system, therefore successfully proving the validity of the buoyancy adjusting method.