The adaptive attitude control was examined for very flexible aircraft (VFA) with uncertainty.The high order of VFA model was reduced by a balanced realization approach,and the singular values of the original model and the reduced-order model were investigated and compared.Based on the reduced-order model,a LQR-PI controller was designed as baseline controller.Considering uncertainty,a model reference adaptive controller was designed by lyapunov stability theory and compared with LQR-PI controller.Simulation results show that the presented scheme has better control effect for VFA with uncertainty,and make the system perform desired attitude motion.%研究系统存在不确定性的大柔性飞行器的姿态跟踪控制问题.针对高阶大柔性飞行器模型,使用平衡实现方法对其降阶,并通过奇异值对比分析系统降阶前后特性.基于降阶模型,设计LQR-PI控制器作为基线控制器.考虑不确定性,利用李雅普诺夫稳定性理论设计模型参考自适应控制器,并对比两种方法的控制效果.仿真结果显示,所提方案对包含不确定性的系统具有较好的控制效果,能使系统完成期望的姿态跟踪目标.
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