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超空泡射弹在运动过程中存在尾拍现象,导致结构发生振动,影响射弹的弹道稳定性,降低射弹结构的可靠性。该文建立了射弹无约束动力学方程,使用有限元法求解得到了超空泡射弹在尾拍载荷作用下的动力学响应,并对射弹的加固模型进行了分析,给出了环状加强筋个数、直径以及间距对降低射弹振幅效果的影响。研究结果表明:超空泡射弹在尾拍运动过程中转动周期和幅值随加强筋个数的增大而增大;射弹头部的弹性振动幅值随加强筋个数和直径的增大而减小,振动周期亦随加强筋个数的增大而减小;加强筋距离的减小,对于降低射弹中部振幅效果明显,但对射弹头部的振动几乎没有影响。
The phenomenon of tailpipe shooting occurs during the movement of the super-vacuumed projectile, causing the structure to vibrate, affecting the ballistic stability of the projectile and reducing the reliability of the projectile structure. In this paper, the unrestrained dynamic equation of projectile is established. The dynamic response of the super-vacuumed projectile under tail load is solved by the finite element method. The reinforcement model of the projectile is analyzed. The influence of the number of stiffeners, diameter and spacing on reducing the amplitude of the projectile. The results show that the rotation period and the amplitude of the super-vacuumed projectile increase with the increase of the number of stiffeners. The elastic vibration amplitude of the projectile head increases with the number of stiffeners and the diameter And the vibration period decreases with the increase of the number of stiffeners. The decrease of the stiffener distance has a significant effect on reducing the amplitude of the middle of the projectile, but has little effect on the head vibration of the projectile.