深圳大学数学科学学院
荔园杰出学者讲座第四十三期
讲座题目:Endpoint Asymptotics of Optimal Stabilization Prefactors
主讲人:汪更生 教授(河套数学与交叉学科研究院)
讲座时间:2026年9月16日16:30-17:30
讲座地点:深圳大学粤海校区汇星楼一号教室
内容摘要:Consider the stabilizable finite-dimensional linear control system $\dot x=Ax+Bu$. For a prescribed decay rate $\delta>0$, we define the optimal stabilization prefactor
$$\Chat(\delta):=\inf_{K\in\R^{m\times n}}\sup_{t\ge0}e^{\delta t}\norm{e^{(A+BK)t}}.$$
We determine its asymptotic behavior as $\delta$ approaches the right endpoint of the achievable decay-rate range. If $(A,B)$ is controllable and $\mu$ is its largest controllability index, then $\Chat(\delta)\asymp\delta^{\mu-1}$ as $\delta\to+\infty$; whereas if $(A,B)$ is stabilizable but not controllable, then $\Chat(\delta)\asymp(\delta_*-\delta)^{-(q-1)}$ as $\delta\uparrow\delta_*$, where $\delta_*$ is the supremal achievable decay rate and $q$ is the largest size of a Jordan block of the uncontrollable part associated with the spectral boundary$\operatorname{Re}\lambda=-\delta_*$. Thus, in both cases, the endpoint asymptotic order of $\Chat(\delta)$ is determined by the corresponding structural invariant---$\mu$ in the controllable case and $q$ in the noncontrollable case---and conversely this order recovers that invariant.
主讲人简介:汪更生长期从事微分方程的控制理论的研究,尤其关注时间最优控制,能观区域的几何特征,和能稳问题的研究,做出若干引人注目的工作。2026年在ICM大会,控制优化方向做45分钟报告。
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数学科学学院
2026年9月14日