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大型运载火箭姿态控制回路与POGO回路的相互作用,容易形成“推进——结构——控制”动力学交叉耦合的纵横扭大回路动力学耦合现象,传统将姿态控制与POGO回路分离设计的方法无法准确得知耦合的程度.本文研究建立“推进——结构——控制”一体的动力学模型,适度简化后,形成稳定性分析模型,以开展大回路特征值计算与稳定性分析.本研究揭示了姿态控制回路与POGO回路动力学耦合的途径与耦合程度,并通过算例验证了“受到控制作用的一阶弯曲模态稳定性不会与液压系统耦合而出现问题”的结论.本文给出了后续研究的建议.
Large carrier rocket attitude control loop and the POGO loop interaction, easy to form a “propulsion - structure - control ” dynamic cross-coupling of the longitudinal and transverse loop large loop dynamics coupling phenomenon, the traditional attitude control and POGO loop separation design Method can not accurately know the coupling degree.This paper studies the establishment of a “propulsion-structure-control” integrated dynamic model, modestly simplified, the formation of stability analysis model to carry out large loop eigenvalue calculation and stability analysis This study reveals the ways and coupling degree of dynamic coupling between attitude control circuit and POGO circuit, and verifies that “the controllable first-order bending mode stability will not couple with the hydraulic system” The conclusion of this paper is given.