2、非结构不确定性（unstructured uncertainty）或非结构摄动（unstructured perturbation）：是指当不确定性的影响不能仅仅用参数摄动来表示，而且系统结 构也发生了变化。
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本文研究非结构不确定性矩阵的鲁棒稳定边界问题。
Research on the robustness bounds for matrices with unstructured uncertainty was addressed.
对一类具有结构不确定性的线性时滞系统的最优非脆弱保性能控制问题进行了研究。
The problem of optimal non-fragile guaranteed cost control for a class of linear time-delay systems with structured uncertainties was considered.
针对一类非匹配不确定性的线性系统，基于块控原理，提出了一种变结构控制设计方法。
For a class of linear systems with uncertainties of unknown bound, a variable structure control (VSC) design method is proposed based on Block control principle.
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