空间大型天线卫星分布式主动拉索振动抑制

    Distributed vibration control of large space antenna satellite with active cable

    • 摘要: 卫星通信技术的快速发展对空间天线卫星的高精度与高稳定性需要日益增加,这对天线结构尺寸提出更高需求,同时对振动控制系统提出了更大挑战。针对空间大型天线卫星结构大柔性、弱阻尼的特点,文章提出一种基于主动分布式拉索振动抑制方案。该结构通过控制主动改变拉索预紧力实现结构高效振动抑制。首先,文章建立空间大型天线动力学模型,对其动态特性进行深入分析,并根据可控性理论对主动拉索振动抑制方案进行评估。随后,应用分布式模型预测控制策略,通过动态预测与实时优化拉索预紧力,精确抑制天线的关键模态振动。数值仿真验证了该控制方案的有效性,与传统的被动阻尼振动抑制方案相比,分布式主动拉索振动抑制方案能够更为高效地抑制结构振动,显著提升系统稳定性与抗扰能力。

       

      Abstract: The rapid development of satellite communication technology has led to increasing demands for higher precision and stability in large space antenna satellite, placing greater requirements on antenna structure dimensions and posing significant challenges for vibration control systems. To address the high flexibility and weak damping characteristics of large space hoop-column antenna structures, this paper proposes an active distributed cable vibration suppression scheme. The scheme achieves efficient vibration suppression by actively adjusting the pretension of the cables. Firstly, a dynamic model of the large space antenna is established. Based on controllability theory, the feasibility of the active cable vibration suppression scheme is evaluated. Subsequently, a Distributed Model Predictive Control (DMPC) strategy is applied to dynamically predict and optimize the cable pretension in real-time, enabling precise suppression of critical modal vibrations in large space antenna. Numerical simulations verify the effectiveness of this control scheme. Compared to traditional passive damping vibration suppression methods, the distributed active cable vibration suppression scheme demonstrates significantly higher efficiency in suppressing structural vibrations and markedly improves system stability and disturbance rejection capabilities.