Almost Sure Exponential Stability of Stochastic Differential Delay Equations

Almost Sure Exponential Stability of Stochastic Differential Delay Equations
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随机微分时滞方程的几乎确定的指数稳定性

DOI:
10.1137/15m1019465
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发表时间:
2016-07
影响因子:
2.2
通讯作者:
Yue Rongxian
Yue Rongxian
中科院分区:
数学2区
文献类型:
--
作者:
Guo Qian;Mao Xuerong;Yue Rongxian

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研究了具有变时滞的多维非线性随机时滞微分方程dx(t)= f(x(t-\delta_1(t)),t)dt + g(x(t-\delta_2(t)),t)dB(t)$的几乎必然指数稳定性,其中$\delta_1,\\delta_2:\mathbb{R}+\to [0,\tau]$表示变时滞.我们证明了如果相应的(非时滞)随机微分方程(SDDE)$dy(t)= f(y(t),t)dt + g(y(t),t)dB(t)$允许一个李雅普诺夫函数(特别地,它暗示了SDDE的几乎必然指数稳定性),则存在一个正数$\tau^*$使得SDDE也几乎必然指数稳定,只要时滞有界$\tau^*$。我们提供了一个隐式的下限$\tau^*$,可以计算数值。此外,我们的新理论使我们能够设计随机延迟反馈控制,以稳定不稳定的微分方程。
This paper is concerned with the almost sure exponential stability of the multi-dimensional nonlinear stochastic differential delay equation (SDDE) with variable delays of the form $dx(t) = f(x(t-\delta_1(t)),t)dt + g(x(t-\delta_2(t)),t) dB(t)$, where $\delta_1, \ \delta_2: \mathbb{R}_+\to [0,\tau]$ stand for variable delays. We show that if the corresponding (nondelay) stochastic differential equation (SDE) $dy(t) = f(y(t),t)dt + g(y(t),t) dB(t)$ admits a Lyapunov function (which in particular implies the almost sure exponential stability of the SDE) then there exists a positive number $\tau^*$ such that the SDDE is also almost sure exponentially stable as long as the delay is bounded by $\tau^*$. We provide an implicit lower bound for $\tau^*$ which can be computed numerically. Moreover, our new theory enables us to design stochastic delay feedback controls in order to stabilize unstable differential equations.
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