飞机等效系统的在线辨识及其微机实现

 引言 等效系统法是国外提出的评价带有复杂控制系统的飞机飞行品质的一种较有效的方法。它的基本思想是寻找一个带有等效时间延迟的低阶系统,使该系统具有或近似保留给定增稳飞机的高阶系统输出响应的主导特性,然后将低阶系统参数与规范要求相比

THE ON-LINE IDENTIFICATION AND ITS MICROPROCESSOR REALIZATION OF THE EQUIVALENT SYSTEMS OF AIRCRAFT

A new method is proposed in this paper to use microprocessor system to evaluate the flight qualities of a aircraft. The extended Kalman filtering algorithm （EKF） is used to estimate the parameters of the discrete model of longitudinal equivalent systems. Some new improvements are made for EKF algorithm to prevent divergence of estimated parameters and to reduce the estimating errors. The algorithm will converge to a local minimum because of the reduced order approximation. Satisfactory accuracy of parameter estimation and fast convergent rates have been achieved by both digital simulation calculation and microprocessor system experiments using arbitrary input signals The experimental system works stationarily and has good repeatable characteristics. That proves the method we have adapted and proposed is suitable.