为了构建火箭弹扰动运动半实物仿真,需要对火箭弹运动进行建模和简化。文中分析影响火箭弹弹体扰动运动的主要因素,构建脉冲发动机工作时弹体扰动方程。利用火箭弹弹体与弹道夹角较小,以及脉冲发动机冲量方向和弹道垂直等特征,对扰动运动方程进行简化,推导出纵向和侧向弹体扰动运动模型,得到扰动运动衰减系数和弹体振荡频率的相关计算公式。仿真结果表明,新扰动运动模型能够模拟火箭弹扰动运动。

For constructing rocket bomb's perturbed motion semi-physical simulation, we should construct and simplify bomb's flight motion model. In this paper, main factors that influence rocket bomb's perturbed motion were analysed, pulse jets correction perturbed motion equations were constructed. Since the attack angle between velocity and bomb's body is small and negligible, and pulse jets correction is perpendicular to the trajectory, we can simplify the perturbed motion equations, and get the model of rocket bomb's perturbed motion, get attenuation coefficient and oscillation frequency's calculation method. Simulation results show that the new simplified model can simulate rocket bomb's perturbed motion and get similar result with 6-DOF trajectory simulation.