【摘要】 文中采用变质量系统的方法,分析了旋转固体火箭发动机工作过程中的章动不稳定性问题。将发动机内部装药简化为变质量系统的药柱,通过对系统姿态运动方程的分析,得到质量变化对飞行器旋转姿态运动的影响,并对几种典型装药进行了计算分析。结果表明,在端面燃烧情况下,固体装药质量的消失对旋转运动的影响是有利的,使得飞行器侧向角速度逐渐趋于稳定;而对于管形装药,结果却刚好相反,质量的消失使旋转的侧向角速度以指数方式递增,从而导致了飞行器的不稳定。通过对结果的分析,提出了发动机如何控制旋转章动和稳定性的设计思想,分析方法也可以帮助解决复杂装药旋转固体火箭发动机飞行器的章动不稳定性问题。更多还原

【Abstract】 This paper introduced the variable mass system to analysis the coning instability problem when spinning solid rocket motor works.The rocket internal propellant was simplified as the variable mass system,and obtained the influence of mass variation to the flight spinning attitude motion through the analysis of attitude equation.A few classical cases were computed.The result indicates that,the mass dissipation of propellant is advantageous to the spinning motion in end burn,which makes the transverse angular velocity tend to stable gradually;but it is opposite in radial burn that the transverse angular velocity grows exponentially,thus causes the unstableness of the flight.Through the analysis of the results proposes the design conception of how to control the rotational instability and coning of rocket in motion,the method also may help to resolve the coning instability of solid rocket motor with complex propellant patterns.更多还原