Analysis on the control of supercavitation projectile stability

The existence of supercavition affects the trajectory as well as the stability of motion of projectile. So modelling and control problems for supercavitation projectile are complicated and important. A ameliorate control device was designed to control the attack angle of cavitator in order to obtain the better stability performances of projectile. The nonlinear dynamics equations motion in body coordinates were obtained via analysed the hydrodynamic of supercavitation projectile. And the control parameter β, attack angle of cavitator, effect the stability of supercavitation projectile was obtained based on stability equations. Simulation results indicate that pitching angle velocity of projectile reduced 90% and the impact force reduced 87% using this control model. This study is of engineering signification.