Centrifugal Disarming Dynamics Simulation of Projectile Inertial Firing Mechanism at Muzzle

During the muzzle exit phase, the centrifugal inertial force generated when the projectile’s spin rate is at its maximum causes the centrifugal block in the inertial firing mechanism to compress the spring and release its restraint on the moving component, thereby disengaging the safety and ensuring successful firing of the projectile. To determine the range of rotational speeds required for centrifugal safety release during the muzzle exit phase so as to guarantee subsequent reliable firing of the projectile, taking the M739-type surrogate projectile as an example: first, the operation principle of the centrifugal safety in the inertial firing mechanism is analysed; next, a force analysis of the centrifugal block within the firing mechanism is conducted to establish the centrifugal safety-release condition during the muzzle exit phase, and initial conditions are substituted to calculate the minimum rotational speed range required to disengage the safety; finally, the centrifugal safety device at the moment of muzzle exit is simulated using the dynamics analysis software ADAMS to verify the correctness of the release condition and the rotational speed range.