BACKSTEPPING控制理论及在非线性飞控系统中的应用

在非线性飞控系统研究领域,反馈线性化方法是使用非常广泛的一种方法.然而反馈线性化理论在飞机控制系统中应用通常与奇异摄动理论结合,需要将飞机动态进行时标分离假设,使用内、外环的控制方案,这种方案在理论上存在着闭环系统可能不稳定的隐患.BACSTEPPING理论是继反馈线性化理论之后发展起来的一种控制理论.基于BACSTEPPING理论的控制系统是通过Lyapunov稳定性理论推导得出,确保了系统闭环稳定性.仿真结果表明此方案是正确和有效的.

BACKSTEPPING Theory and It's Application in the Nonlinear Flight Control System

Feedback linearizaton theory is applied in nonolinear flight control research field abroadly. while The flight control approach based on feedback linearizaton theory usually is applied by inner-outer loop control with the assumption that flight dynamic property is timescale separation. The stability of this timescale separation approach may be analyzed by the singular perturbation theory. However, in most nonolinear flight control research, the gain of the inner-loop controller is set much larger than that of the outer loop controller, and it is assumed that aircraft dynamic satisfies this property. This, therefore does not guarantee closed-loop stability. Backstepping theory was developed following the feedback linearizaton theory. While backstepping -based nonlinear flight control approach is used without the timescale separation assumption, then avoid the hidden trouble that causes closed - loop system instability in theory, validity and availability of this approach is verified by the simulation.