大型空间可展开天线展开过程组合控制研究

Study on Combination Control of Deploy Process of Large Space Deployable Antenna

针对大型空间可展开天线展开过程控制问题,基于奇异摄动理论将天线系统分解为慢变、快变两个子系统,提出一种将非线性PID控制和H∞鲁棒控制相结合的组合控制方法。慢变子系统采用非线性PID控制来控制刚性运动跟踪期望轨迹,快变子系统采用H∞控制抑制弹性振动,从而保证刚性、柔性状态输出同时达到要求。仿真结果表明:采用该方法可使弹性变形对本体运动的影响减小,在天线较好地跟踪期望轨迹展开的同时,有效地抑制了弹性振动,显著改善了系统的跟踪性能和稳定性能。

Aimming at the control problems of the deploy process for a large space deployable antenna, the system was separated into slow change sub-systems and fast change sub-system based on the singular perturbation method. The combined control method was present, which combined non -linear PID control and H∞ robust control. The non-linear PID controller was designed for the slow sub-system to control the rigid moment to track the expect track, while H∞ controller was designed for the fast sub-system to constrain the flexible vibration, which can guarantee the export of rigid and flexible state can satisfy the requirements simultaneity. Simulation results show that this method can minish the infection of elastic vabiration to the noumenon monment, the antenna can track the expect track to deploy, the elastic vibration is constraind simultaneity, the capability of track and stability of the system is improved markedly.