基于降阶模型的弹性飞行器QFT控制器设计与仿真  

Applying Quantitative Feedback Theory(QFT) to Designing Controller for Flexible Flight Vehicle

作　　者：李爱军[1] 孟文杰[1] 徐丽娜[1] 刘世民[1] 

机构地区：[1]西北工业大学自动化学院,陕西西安710072

出　　处：《西北工业大学学报》2010年第6期916-920,共5页Journal of Northwestern Polytechnical University

基　　金：航空科学基金(20080553018;20090753007)资助

摘　　要：弹性飞行器具有很高的阶次,直接设计控制器会很困难,且不利于工程实现。为此,文章研究了基于降阶模型的控制器设计方法。以某大型弹性飞行器12阶模型为研究对象,首先利用平衡截断降阶方法对该模型降阶,所得到6阶的降阶模型能在较宽频段范围内近似全阶模型。然后,基于降阶模型,使用QFT方法设计飞行器的高度保持控制器,直接用于12阶模型的控制。给出了系统高度响应、鲁棒性验证以及系统状态和4阶弹性变形模态的仿真结果曲线。仿真结果表明,无论是在标称状态,还是当系统矩阵摄动的状态,高度响应都能快速跟踪指令信号,且无稳态误差,调节时间约为7 s,系统的各阶结构弹性变形模态都得到了快速抑制,最终衰减为零。Aim.The introduction of the full paper reviews Refs.1 through 3 and then proposes applying QFT to designing controller.Sections 1 and 2 explain our controller design method,which is illustrated by taking a certain type of flexible flight vehicle as example.Their core consists of：（1） we employ the balanced truncation reduction method to reduce the number of orders of the flexible flight vehicle model from 12 orders to 6;（2） the 6-order model approaches the performance of its full-order model in a wide frequency band range;（3） using the reduced-order model,we apply the QFT to designing the longitudinal altitude-holding controller,which is directly used to control the 12-order model of flexible flight vehicle.Section 3 simulates our design method;the simulation results,presented in Figs.5,6 and 7,and their analysis show preliminarily that：（1） the command signals of the controller thus designed can be tracked quickly by its altitude response without steady-state error not only in normal state but also in system matrix perturbed state;（2） the tuning time is about 7s;（3） the elastic structure transform modals of all orders can be restrained quickly and become zero finally.

关 键 词：弹性飞行器 模型降阶 平衡截断 定量反馈 飞行控制 

分 类 号：V249[航空宇航科学与技术—飞行器设计]