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由于排队论不可能求解排队系统中的时间序列问题,因此,将时间列自相关函数的定义作了推广,以便应用于这一问题。方法是将m视为另一种采样规则下所得序列的序号,即以排队到达时刻为采样时刻。由此可以试探寻排队系统等待时间序列{WT(n)}等的ARMA模型。文中还建立了排队系统时间序列的广义谱的概念,可以期望,广义谱概念的建立,将十分有助于对排队系统输出序列、排队仿真序列以及所有离散系统随机仿真序列特征与规律的揭示。 相似文献
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提出了一种滑模等式约束的广义预测控制方法.该方法将广义预测控制与离散滑模控制结合起来用于具有大惯性、大时滞、时变和非线性的热力站换热机组的供水温度控制系统中,并采用柔化输入信号的方法,可避免广义预测控制算法中的矩阵求逆,有效缩短了预测时域,减小计算量.最后给出了稳定性分析并通过仿真验证了该方法的有效性. 相似文献
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广义时滞系统的时滞相关型H∞控制 总被引:1,自引:0,他引:1
研究了广义时滞系统的时滞相关型H∞控制问题.利用一个新构造的增广一离散化李亚普诺夫泛函并结合自由权矩阵方法,给出了使得系统正则、无脉冲、稳定且具有给定H∞性能界的时滞相关型有界实引理(BRL).在所得BRL基础上,得到了系统H∞状态反馈控制律的一个直接的设计方法.所给结果均以严格线性矩阵不等式( LMI)表示.数值实例表明了结果的有效性和较小保守性. 相似文献
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介绍了广义系统的基本思想及近年来的发展方向,讨论了广义系统的经济控制、分散控制、鲁棒控制、网络控制,探讨了其在控制工程中的应用,并结合其应用背景给出了广义系统在控制工程中的应用实例。 相似文献
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针对一类具有非线性扰动的不确定广义时滞系统,研究了鲁棒最优H∞控制问题.利用矩阵不等式和引入自由矩阵的方法,得到闭环系统正则、无脉冲、渐近稳定的且具有H∞范数有界的时滞相关充分条件.基于相应的线性矩阵不等式可行解,给出广义系统的H∞控制律,并且给出的数值仿真例子说明了方法的有效性。 相似文献
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针对具有空间依赖耦合系数的分数阶反应扩散系统, 利用反步法设计了基于观测器的边界输出反馈控制器, 证明了观测增益和控制增益核函数矩阵方程的适定性. 针对误差系统和输出反馈的闭环系统, 利用分数阶Lyapunov方法分析了系统的Mittag-Leffler稳定性, 且利用Wirtinger不等式改进了耦合系统稳定的条件. 当系统具有空间依赖的耦合系数时, 难以求得控制增益和观测增益核函数的解析解, 为此, 给出了核函数偏微分方程的数值解方法. 数值仿真验证了理论结果. 相似文献
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研究了一类脉冲依赖于状态的混杂系统的最优控制问题.与传统的变分方法不同,通过将跳跃瞬间转化为一个新的待优化参数,得到了该混杂系统的必要最优性条件,从而将最优控制问题转化为一边界值问题,该边界值问题可由数值方法或解析方法解决.此外,利用广义微分的理论,将该必要最优性条件推广到Frechet微分形式.结论表明,在混杂动态系统运行的连续部分,最优解所满足的必要性条件和传统的连续系统相同.在混杂动态系统的脉冲点处,哈密尔顿函数满足连续性条件,协态变量则满足一定的跳跃条件.最后,通过两个实例分析,表明该方法是有效的. 相似文献
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Moulay Rchid Sidi Ammi 《International journal of control》2013,86(11):1789-1801
We are concerned with the optimal control problem of the well known nonlocal thermistor problem, i.e. in studying the heat transfer in the resistor device whose electrical conductivity is strongly dependent on the temperature. Existence of an optimal control is proved. The optimality system consisting of the state system coupled with adjoint equations is derived, together with a characterisation of the optimal control. Uniqueness of solution to the optimality system, and therefore, the uniqueness of the optimal control, is established. The last part is devoted to numerical simulations. 相似文献
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Eugene Khmelnitsky 《Discrete Event Dynamic Systems》1999,9(3):241-260
The problem of detailed scheduling of complex flexible manufacturing systems is addressed by optimal flow control. A model problem of scheduling parallel machines is considered to obtain necessary setup conditions. Studying the conditions results in a new solution approach that takes advantage of a juggling analogy of the production/setup scheduling. This analogy is used in the paper to direct construction of a solution method. The method searches for a globally optimal schedule by means of both a juggling strategy and a method of global optimization. The results obtained for a model problem are then generalized to systems with complex production and setup operations. Computational examples demonstrate the validity of the approach. 相似文献
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《Optimization methods & software》2012,27(4):573-599
We present an algorithm for the solution of general inequality constrained optimization problems. The algorithm is based upon an exact penalty function that is approximated by a family of smooth functions. We present convergence results. As numerical examples we treat state constrained optimal control problems for elliptic partial differential equations. We compare the results with existing methods. 相似文献
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JIA Chao-Hua FENG De-Xing 《自动化学报》2005,(2)
The optimal control problem for a nonlinear elliptic population system is considered. First, under certain hypotheses, the existence and uniqueness of coexistence state solutions are shown. Then the existence of the optimal control is given and the optimality system is established. 相似文献
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The optimal control problem for a nonlinear elliptic population system is considered. First, under certain hypotheses, the existence and uniqueness of coexistence state solutions are shown. Then the existence of the optimal control is given and the optimality system is established. 相似文献
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张菊梅 《计算机与数字工程》2013,41(7)
分数阶微积分方程的应用逐渐受到广大研究者的重视.论文以Haar小波基函数来逼近线性分数阶微积分方程,通过数值算例的数值解与精确解进行比较,结果表明论文方法是有效的且具有较高的精度. 相似文献
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This paper deals with a numerical method for solving variable-order fractional optimal control problem with a fractional Bolza cost composed as the aggregate of a standard Mayer cost and a fractional Lagrange cost given by a variable-order Riemann–Liouville fractional integral. Using the integration by part formula and the calculus of variations, the necessary optimality conditions are derived in terms of two-point variable-order boundary value problem. Operational matrices of variable-order right and left Riemann–Liouville integration are derived, and by using them, the two-point boundary value problem is reduced into the system of algebraic equations. Additionally, the convergence analysis of the proposed method has been considered. Moreover, illustrative examples are given to demonstrate the applicability of the proposed method. 相似文献