求取飞机低阶等效模型的时域方法  

Time-Domain Methods for Aircraft Longitudinal Low Order Equivalent System

作　　者：张清江[1] 阙向东[1] 赵国军[1] 吴梅[1] 

机构地区：[1]西北工业大学自动化学院,西安710072

出　　处：《弹箭与制导学报》2006年第S2期499-502,共4页Journal of Projectiles,Rockets,Missiles and Guidance

摘　　要：现代高增稳飞机是高达几十阶的高阶模型,将其降阶为具有特定形式的低阶等效系统才能与已有的飞行品质规范相比较,进而评价飞行品质及改进飞控系统设计。文中从时域角度出发,给出了两种方法即时域等效系统法和最小二乘辨识算法,可以利用飞行记录数据来求取飞机纵向短周期等各种形式的低阶等效系统参数,其中最小二乘辨识算法还可推广到在线辨识。仿真结果表明两种算法简单可靠、精度较好,具有一定的工程应用价值。The order of modern highly augmented aircraft is very high.It should be reduced to it's low order equivalent system(LOES)for evaluating the handling quality of aircraft and design of flight control system.Here two time-domain methods are studied which is called the time-domain equivalent system method(TDESM)and least squares(LS)identifi- cation algorithm.Both of them can use flight test data.Simulation shows that time responses of the equivalent systems can finely approximate that of original high order systems in short period movement.

关 键 词：低阶等效系统 时域等效系统方法 最小二乘辨识 飞行品质 

分 类 号：V212.13[航空宇航科学与技术—航空宇航推进理论与工程]