基于弹丸旋转规律的弹道终点辨识和引信全弹道安全控制方法

The complex flight environment may lead to an unintentional discharge of ammunition in the ready state. The motion equations are obtained and the decay law of projectile rotation velocity over time is established by employing the fourth-order Runge-Kutta algorithm to solve the six-degree-of-freedom rigid body trajectory equation. Experimental firing tests of a specific grenade are conducted, and the test data is collected to verify the zero-cross characteristic point of the second derivative of projectile rotation period. To investigate how the launch conditions such as firing charge and firing angle affect these characteristic points, an identification method based on rotating characteristic points for determining the ballistic endpoint moments is proposed. Additionally, a real-time identification system with magnetic field sensors for ballistic endpoints is designed and validated through firing range tests. The results demonstrate that the relative error between the ballistic endpoint identification system and a ballistic tracking radar is less than 5%, thus confirming the accuracy of the proposed method. On this basis a mechanical-electronic dual-mode full-trajectory safety control approach is proposed for rotationally stabilized munitions Based on the environmental information including recoil overload and rotational centrifugal force after launch, the endpoint identification is used as a third environmental factor to achieve the comprehensive fuze safety control throughout the entire trajectory. The proposed method of identifying the ballistic endpoints and implementing the fuze safety control based on projectile rotation laws offers new possibilities for enhancing the overall ballistic safety of rotationally stabilized munitions.