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针对高超声速飞行器再入过程中飞行包线大,参数不确定性强等特点,设计一种利用不确定系统建模和μ综合控制的鲁棒姿态控制器。首先,考虑飞行器的参数不确定性,建立系统线性分式变换(LFT)模型。随后,考虑建模结构不确定性及测量噪声等的影响,建立用于μ综合控制的互联结构。最后,分别设计H∞控制器和μ综合控制器,结合频域μ分析方法对系统鲁棒性和动态性能作了对比分析,结果表明该方法可以很好地跟踪指令,具有较强的鲁棒稳定性。
Aiming at the characteristics of large flight envelopes and strong parameter uncertainties during the reentry of hypersonic vehicle, a robust attitude controller based on uncertain system modeling and μ integrated control is designed. First, considering the uncertainty of the parameters of the aircraft, a system linear fractional transformation (LFT) model is established. Subsequently, considering the influence of modeling structure uncertainty and measurement noise, an interconnection structure for μ integrated control is established. Finally, the H∞ controller and the μ integrated controller are designed respectively. The frequency-domain μ analysis method is used to compare the robustness and dynamic performance of the system. The results show that the proposed method can track the command well and has strong robustness stability.