考虑液体晃动效应的运载火箭等效转动惯量对姿控系统稳定裕度的影响

Effect of Equivalent Inertial Moment on Rocket Attitude Control Correlative Margin with Consideration of Liquid Shaking

基于某型火箭,分析了考虑液体晃动后的全箭等效转动惯量变化,同时仿真了对姿控系统设计结果的影响,给出了姿控系统相关裕度的变化。结果表明:液体晃动的等效效应对一级转动惯量Jz的影响较小,对二级转动惯量Jz的影响较大;等效转动惯量对二级高频稳定裕度基本不产生影响,而系统的中、低频稳定裕度均有一定程度的下降。

The equivalent inertial moment about rocket that considering the shaking of the liquid was analyzed based on some two-stage rocket in this paper.The effect on the design of the attitude control system was simulated.The change of the correlative margins in attitude control system was given out.The results showed that the equivalent effect of the liquid shaking on the first level inertia moment Jz was small but on the second level inertia moment Jz was big.And the equivalent inertia moment had little effect on the first level high frequency correlative margin but the low and middle frequency correlative margin would be decreased.