描述函数理论及其在航天中的应用

Describing Function Theory and Its application in Aerospace

在分析非线性系统时，描述函数作为一种古典的频域方法，具有许多优点。描述函数分析准则的修正赋予描述函数理论新的内涵，并为挠性航天器非线性喷嘴控制系统设计分析提供了一种有效手段，以谐波描述函数理论为基础，探讨了脉冲调制器描述函数的区域线性化，并对挠性航天器的姿态控制系统进行设计、分析，使航天器的姿态控制系统满足稳定性、控制精度等性能，并具有一定的鲁棒稳定性。

As a classical frequency method,Describing Function(DF)has numerous advantages when it is applied in analysis nonlinear systems.The modification of DF analysis principle gives a new content to the design of the nonlinear jet control system of flexible spacecraft.On the basis of harmonic DF theory,it explores the DF regional linearization.It designs and analyses the attitude control system of flexible spacecraft,as well satisfying its performance such as stability,control accuracy,furthermore,certain robust stability.