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本文对弹头进动停止的现象作了分析研究并对造成这种现象的几种假设进行了讨论。文中既给出了解析解,也给出了六自由度模拟的结果。除弹头滚转过零、滚转近零和攻角发散外,还存在另外四种气动力激励函数。这些函数都十分重要,因为它们会导致所谓的“空间固定配平”,即升力矢量在空间瞬问固定。四个激励函数是:(1)高动压环境下固定于体轴的配平力矩转变成固定于风轴的配平力矩;(2)弹头具有瞬态的不稳定气动力稳定性导数;(3)由于一系列不对称的端头剥蚀而引起的配平平面转动;(4)马格努斯型平面外力矩与由烧蚀滞后现象造成的固定于风轴的力矩相组合。当出现上述现象时,弹道偏差就会大到不允许的程度。按照现有的解析结果和数值计算结果,弹头的初始自旋速率对弹头散布的大小和方向来说都是起关键作用的因素。最后对可能造成弹头进动停止的物理机理提出了一些看法。
This paper analyzes the phenomenon of warhead precession stop and discusses several hypotheses that cause this phenomenon. In this paper, both analytical solutions are given, and the results of six-degree-of-freedom simulation are also given. Except bullet roll zero, roll nearly zero and divergence of attack angle, there are four other kinds of aerodynamic excitation functions. These functions are all important because they result in so-called “fixed-space” configurations, where the lift vector is stationary in space. The four excitation functions are: (1) the trim torque fixed to the body axis in a high dynamic pressure environment is converted into a trim torque fixed to a wind shaft; (2) the warhead has a transient unstable instability aerodynamic stability derivative; (3) (4) The Magnus-type out-of-plane moment is combined with the moment fixed to the wind shaft caused by ablation hysteresis. When the above phenomenon occurs, the trajectory deviation will be large to the extent not allowed. According to the existing analytical and numerical results, the initial spin rate of the warhead plays a key role in the size and direction of the warhead spread. Finally, some ideas about the physical mechanism that may cause the warhead to stop moving forward are given.