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针对弹性飞行器综合鲁棒控制性能受模型降阶误差影响的问题,提出了一种双回路鲁棒控制设计方法。首先利用次优控制方法设计内反馈回路,有效降低了降阶后模型的误差界;然后采用混合灵敏度H∞鲁棒控制方法设计外回路,保证了系统的鲁棒稳定性和性能。仿真结果表明,双回路方法并没有增加控制器阶次,但在满足系统鲁棒稳定性要求的前提下较大地提升了控制器性能,其控制性能明显优于单回路鲁棒控制器。同时这种控制器能够有效降低控制系统与动力学系统间的不利耦合,延缓伺服颤振的发生,是一种非常适用于弹性飞行器的控制方法。
Aiming at the problem that the comprehensive robust control performance of the flexible aircraft is affected by the reduced order error of the model, a robust control design method of double loop is proposed. First, the sub-optimal control method is used to design the internal feedback loop, which effectively reduces the error bound of the reduced-order model. Secondly, the hybrid sensitivity H∞ robust control method is used to design the external loop to ensure the robust stability and performance of the system. The simulation results show that the double-loop method does not increase the controller order, but greatly improves the performance of the controller under the premise of meeting the requirement of robust stability of the system, and its control performance is obviously better than the single-loop robust controller. At the same time, this controller can effectively reduce the adverse coupling between control system and dynamic system and delay the occurrence of servo flutter, which is a very suitable control method for flexible aircraft.