Mathematics modeling and SMVS control research of supercavitating projectiles based on thrust vector

At present, the control method combining cavitator with fins is generally used to study the control of the supercavitating projectile. However, fins have many shortages such as causing cavitation itself, which will make fins lose their control action. In this paper, it is proposed to use cavitator and thrust vector to control the supercavitating projectile. Force acting on the supercavitating projectile is analyzed in detail and a six degree of freedom nonlinear mathematical model is established. The controller is designed by use of the SMVS (sliding mode variable structure) control theory and simulation analysis is done for the system. The simulation results display system dynamic performance has distinct improvement and response speed has obvious enhancement compared with the robust pole placement algorithm results. In considering external disturbance and system parameter uncertainty, anti-interference of the controller is examined, the simulation results show the system dynamic performance is still good and the SMVS controller is available.