Abstract: The canard and bearing are dynamically modeled to improve the dual-spin trajectory model based on Euler approach. The working condition of electromagnetic actuator of trajectory correction projectile with decoupled canards (TCPDC) is investigated. The designed working condition is validated by the parameters derived from the dual-spin trajectory. The spin-rate and electromagnetic torque of actuator are extracted based on the rolling states of projectile and canards. The calculated results indicate that the canards spin in relative to the opposite direction of projectile body rapidly after launch, and then spin down at a relatively low and stable rate, which is hardly affected by the launching conditions. The spin rate of projectile is the main factor, which leads to a large range of actuator’s working speed. After the projectile flies through an apogee, the spin rate of actuator could be stably maintained between 130 and 230 r/s, and the essential torque is less than 0.5 N·m. In terms of the working range of actuator, the optimal starting control point should be in the segment behind the apogee.

Key words: ordnance science and technology, trajectory correction, dual-spin projectile, exterior ballistics, actuator