RLV再入结构化鲁棒控制器设计

摘要

RLV再入飞行动态快速时变,强耦合与非线性严重,为此在非线性动态逆控制的基础上,提出了一种结构化的鲁棒控制器设计方法.根据RLV再入飞行动态,建立了其姿态控制仿射非线性模型.基于时标分离原理应用NDI方法进行了RLV控制结构的线性化,克服了小扰动线性化损失飞行器动态信息的缺点.根据RLV再入控制性能指标要求引入优化的思想,采用鲁棒优化方法实现对性能指标与干扰抑制能力的折衷.所设计的结构化鲁棒控制器能有效实现对RLV再入姿态的控制,并具有抗干扰能力,克服了NDI方法对模型的依赖性.%The flight dynamics of RLV reentry is fast time-varying,strongly coupled and seriously nonlinear.A structured robust controller was designed for RLV reentry attitude control.According to RLV reentry flight dynamics,the attitude control affine nonlinear model was established.Standard NDI method was applied to design the dual-loop control structure based on time-scale separation principle,overcoming the disadvantage of losing dynamic information compared with small perturbation linearization method.The robust optimization was adopted in the dual-loop control structure to compromise the performance index and the interference suppression ability.The proposed structured robust controller reduces the dependence on strict model of NDI.The simulation results show that the structured robust controller can effectively control the RLV reentry attitude and have anti-interference ability.