本文首先讨论了非线性系统的有限时间稳定,并给出了其全局有限时间稳定的一个充分条件.然后,利用几何齐次理论、Lyapunov稳定性理论,并通过构造一个增益适应律,对一类具有下三角结构的非线性系统,讨论其全局有限时间稳定状态观测器的设计问题,所设计的观测器是连续非光滑的,能够在有限时间段内实现状态的精确重构.
Finite-time stability is investigated for a class of nonlinear systems and a new sufficient condition for global finite-time stability is presented.By using homogeneous theory and Lyapunov theory,together with an update law for the gain,we develop a global finite-time observer for a class of nonlinear systems with a lower-triangular structure.The observer is continuous but nonsmooth,which can reconstruct the states precisely in a finite-time interval.