Abstract: According to the mechanical structure feature of firing line stabilization system of self-propelledantiaircraft (SPAA) gun, the shaft torque characteristics of torque motor in the case of direct drive areresearched. The moment of momentum theorem and the superposition theorem are used to establish aNewton-Euler dynamic model for SPAA firing line stabilization system, and the dynamic characteristics ofturret revolution body and gun elevation axis under the conditions of vehicle motion and shooting impactdisturbance are simulated. The simulation results show that the cross coupling torque brought to the turretrevolution body due to the vehicle motion is the main disturbance torque to which the turret revolutionbody is subjected, and the control moment of azimuth axis and the disturbance torque of elevation axis in-crease with the increase in shooting angle. The inertial moment at high angle makes the control moment ofazimuth axis increases faster, and the disturbance torque of elevation axis and the disturbance torque ofazimuth axis at low angle are the main components of corresponding shaft control moment. The resultsprovide a foundation for designing of SPAA firing line stabilization system.

Key words: ordnance science and technology, self-propelled antiaircraft gun, firing line stabilization, torque motor, direct drive, dynamics model