共查询到17条相似文献,搜索用时 96 毫秒
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本文对离散线性时变系统的稳定性问题进行了研究。给出离散线性定常系统收敛速度的定义,基于离散线性时变系统Lyapunov稳定理论,给出离散线性时变系统稳定的充分条件,即系统系数满足系数冻结条件和系数变化条件。仿真验证了结论的正确性。 相似文献
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本文对二阶离散线性时变稳定性问题进行了研究。在离散线性时变系统Lyapunov稳定理论的基础上,给出二阶离散线性时变系统稳定的充分条件。即系统系数满足系数冻结条件和系数变化条件。仿真验证了结论的正确性。 相似文献
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运用比较原理和导数不连续的李雅普诺夫函数,结合分解集结等方法,研究具有滞后的测度型线性时变脉冲扰动大系统的全局指数稳定性。结果表明,在一定条件下,由相应较低阶的定常时滞比较系统的指数稳定性,可得到时滞脉冲扰动时变大系统零解的全局指数稳定性。 相似文献
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针对二阶离散式模糊追踪系统,提出用于构造一种最优模糊追踪器的设计方式,并用于追踪一类时变目标或任意模型目标.为了能让所提出的设计方法完整并达到总体最小化,提出了一种近似线性化的离散模糊动态系统的表示法.另外,为了简化计算量,一个多层分解方式被用于本文所提出的最优设计程序中,模拟结果显示,本文提出的最优模糊追踪设计方式确能达到预期效果. 相似文献
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本文应用Riccati矩阵微分方程的对称正定解做出了二次型的李雅普诺夫函数,并应用向量李雅普诺夫函数法与比较原理,扩大了线性时变控制大系统的参数稳定域。 相似文献
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本文运用向量李雅普诺夫函数和比较原理的方法研究一类线性时变大系统的运动稳定性同时扩大了文[1]所研究的n阶常系数线性方程组和文[2]所研究的一类时变大系统的参数稳定性区域。 相似文献
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线性时变系统的分散自校正控制* 总被引:1,自引:0,他引:1
本文对由存在有界扰动和非线性关联的子系统组成的线性时变离散大系统提出了一种多项式逼近的分散自校正控制算法。也可用神经网络去实现自校正控制,采用神经网络作为预报和控制器,网络学习算法用Widrow-Hoff规则。证明了这种分散自校正控制系统的稳定性,仿真结果表明系统是稳定的,可以很好地跟踪期望输出。 相似文献
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The objective of this paper is to show how to choose a Liapunov function to obtain the best and sometimes exact estimates of the degree of exponential stability for linear time-invariant discrete systems. The choice is interesting because it is also shown that it provides the largest robustness bounds on non-linear time-varying perturbations which can be established by either norm-like or quadratic Liapunov functions. By applying the results obtained to large-scale systems, where the role of perturbations is played by the interconnections among the subsystems, the least conservative stability conditions are derived for the overall system which are available in the context of vector Liapunov functions and M-matrices. 相似文献
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A new aggregation form of large-scale systems is proposed in this paper. It is of the ‘Lotka-Volterra’ type and appears natural for the generalized Lotka-Volterra large-scale (possibly time-varying) systems, which is shown in the paper. The Lotka-Volterra aggregation form yields a comparison system of the generalized Lotka-Volterra type, which is composed of a linear and a non-linear part. In addition this aggregation form leads to new stability conditions for time-varying large-scale systems, and enables an extension of Weissenberger's results on exponential stability domain estimates to the asymptotic stability domain estimate of time-varying systems. An advantageous feature of the system aggregation and stability analysis developed in the paper is the omission of requirements for (any particular, e.g. exponential) stability of disconnected subsystems. 相似文献
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Zuowei CaiAuthor Vitae 《Neurocomputing》2011,74(17):3170-3179
In this paper, we study a general class of neural networks with discrete and distributed time-varying delays, whose neuron activations are discontinuous and may be unbounded or nonmonotonic. By using the Leray-Schauder alternative theorem in multivalued analysis, matrix theory and generalized Lyapunov-like approach, we obtain some sufficient conditions ensuring the existence, uniqueness and global asymptotic stability of the periodic solution. Moreover, when all the variable coefficients and time delays are real constants, we discuss the global convergence in finite time of the neural network dynamical system. Our results extend previous works not only on discrete and distributed time-varying delayed neural networks with continuous or even Lipschitz continuous activations, but also on discrete and distributed time-varying delayed neural networks with discontinuous activations. Two numerical examples are given to illustrate the effectiveness of our main results. 相似文献
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本文讨论了时变人口系统稳定性的提法,给出了离散型时变人口系统稳定性的六个定理、六个推论和五个推广,说明了它们的实际意义,给出了临界总和生育率及其上临界和下临界,并给出了我国的数字实例. 相似文献