In this paper

the relationship between the minimum buoyancy adjustment required for underwater glider to dive to a certain depth and the buoyancy change caused by seawater density and self-deformation is deduced; the force analysis of the diving process is carried out

and the relationship between the gliding speed and the net buoyancy is derived. Through the sea trial data

the buoyancy change of the HUST-1 underwater glider when it dived to 1 000 m was obtained

and the deformation of the pressure shell was calculated. Considering the seawater pressure

the compressive deformation at 1 000 m is obtained with Workbench simulation

which is 31.7% different from the sea test result. Considering the seawater temperature simulation

the change in temperature difference is obtained. It is inaccurate to consider the influence of the pressure on the pressure shell

and the influence of the temperature must also be considered

which also shows that it is feasible to calculate the deformation of the underwater glider with the numerical simulation. Based on this numerical simulation method

in the depth of 0 ~ 1 200 m

considering the density

pressure and temperature of seawater

the change in buoyancy in the divingof HUST-2 underwater glider is analyzed

and the minimum buoyancy adjustment required for diving to 0 ~ 200 m changes. It is very large

more than 500 mL

and within 200 ~ 1 200 m

the minimum required buoyancy adjustment amount changes slowly

only about 85 mL. Afterwards

when the HUST-2 underwater glider conducts sea trials for different diving depths

the minimum buoyancy adjustment calculated in this paper can save testing time and cost.