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基于Hopfield神经网络的双线性离散系统最优控制 总被引:3,自引:0,他引:3
将基于二次型性能指标的离散双线性系统最优控制问题转化为动态规划问题,并用Hopfield神经网络(HNN)求解.该方法具有结构简单、易于硬件实现、求解速度快且能求得精确最优解等特点.在复杂系统的实时优化与控制等方面具有广阔的应用前景. 相似文献
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在常见的工作站和服务器系统中,系统的“关机事件跟踪程序”都是个非常实用的功能。通过它.用户可以了解到系统关闭的原因.以此来分析系统遇到和存在的问题。而事实上,在个人用户的Windows系统(本文以Win7为例)中,也包含有“关机事件跟踪程序”的相关功能.那么我们如何才能用它进行系统保护呢? 相似文献
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为克服现有近似最优跟踪控制方法只能跟踪连续可微参考输入的局限,本文针对一类具有未知动态的连续时间非线性时不变仿射系统,提出了一种新的基于自适应动态规划的鲁棒近似最优跟踪控制方法.首先采用递归神经网络建立系统模型,然后建立评价神经网络对最优性能指标进行估计,从而得到最优性能指标偏导数的估计值,进而得到近似最优跟踪控制器,最后利用系统输出与参考输入之间的跟踪误差设计鲁棒项对神经网络建模误差进行补偿.分别针对两个非线性系统进行仿真实验,仿真结果表明了所提方法的有效性和优越性. 相似文献
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离散事件动态系统中的控制综合问题 总被引:2,自引:0,他引:2
本文将离散事件动态系统(DEDS)监控方法中的控制综合问题作了系统的分类,得到了六种控制综合问题,并将它们表示成泛函极值问题,讨论了它们的可行解,最优解的存在性,可生解集的结构以及相互之间的关系。 相似文献
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文章讨论了一类非线性系统稳定自适应跟踪控制问题。为使非线性闭环系统的稳定及跟踪误差的收敛,对系统方程进行恒等变换,用径向基函数(RBF)神经网络逼近系统方程中的未知函数。在反步控制中构建控制律和更新律,并引入动态面控制(DSC)技术避免对虚拟控制变量求导出现奇异。通过Lyapunov泛函分析,推导出非线性系统镇定条件及所有闭环信号是半全局一致最终有界。最后由两个例子实现参考轨迹的有限时间跟踪,跟踪误差都能收敛到0的小邻域,验证了所提方案的有效性和鲁棒性。 相似文献
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德拜媒质微波加热过程中,由于介电常数具有随温度变化的特性,导致电磁场的空间分布将会产生巨大的变化.若缺乏合理的功率调控策略,将导致燃烧、爆炸等一系列热失控现象.针对上述问题,本文提出一种滚动时域H∞保性能温度跟踪控制策略,以实现对监测位置的最高温度进行控制.基于微波加热德拜媒质的机理模型,同时考虑跟踪系统稳定性、动态性能和输入约束,以H∞增益和保性能函数作为性能指标,本文将温度跟踪问题转化为线性矩阵不等式(Linear matrix inequality,LMI)多目标优化问题,使得系统动态性能达到最优.最后以德拜媒质微波加热短波导模型为例,对所提出方法的有效性进行仿真验证. 相似文献
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一种基于随机平均的最优时滞控制方法 总被引:1,自引:1,他引:0
基于时滞系统的随机平均法与随机动态规划原理,提出一种非线性系统的随机最优时滞控制方法.先应用时滞随机平均法,将非线性系统的随机最优时滞控制问题变换成非时滞的最优控制问题;再根据随机动态规划原理,建立其动态规划方程;由此确定最优时滞控制律;最后,通过一个例子说明该时滞控制方法的控制效果. 相似文献
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系统辨识与建模的一种新方法 总被引:4,自引:0,他引:4
本文从函数逼近观点研究线性和非线性系统辨
识问题,导出辨识方程,提出用神经网络建立线性和非线性系统的模型.根据函数内差逼近
原理建立神经网络学习方程,给出优化算法.计算机仿真表明新算法计算速度快,具有良好
的推广、逼近和收敛特性. 相似文献
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Control for a semi-Markovian inventory system is considered. Under general assumptions on system functioning, conditions for existence of an optimal nonrandomized Markovian strategy are found. It is shown that under some additional assumptions on storing conditions for the inventory, the optimal strategy has a threshold (s, S)-frame. 相似文献
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In this paper, the optimal filtering problem for linear systems with state and observation delays is treated proceeding from the general expression for the stochastic Ito differential of the optimal estimate, error variance, and various error covariances. As a result, the optimal estimate equation similar to the traditional Kalman–Bucy one is derived; however, it is impossible to obtain a system of the filtering equations, that is closed with respect to the only two variables, the optimal estimate and the error variance, as in the Kalman–Bucy filter. The resulting system of equations for determining the filter gain matrix consists, in the general case, of an infinite set of equations. It is however demonstrated that a finite set of the filtering equations, whose number is specified by the ratio between the current filtering horizon and the delay values, can be obtained in the particular case of equal or commensurable (τ=qh, q is natural) delays in the observation and state equations. In the example, performance of the designed optimal filter for linear systems with state and observation delays is verified against the best Kalman–Bucy filter available for linear systems without delays and two versions of the extended Kalman–Bucy filter for time delay systems. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
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设计了直升机LQR最优控制系统,并针对LQR控制中加权矩阵和难以确定的问题,进行了试验分析,从实际控制效果出发.找出了系统响应与和之间遵循的规律,为在利用该方法进行其它控制系统设计中和的选取提供了参考。 相似文献
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In this paper, the optimal filtering problem for a linear system over observations with multiple delays is treated proceeding from the general expression for the stochastic Ito differential of the optimal estimate and its variance. As a result, the optimal filtering equations similar to the traditional Kalman–Bucy ones are obtained in the form dual to the Smith predictor, commonly used for robust control design in time‐delay systems. In the example, the obtained optimal filter over observations with multiple delays is verified for a sample system and compared with the best Kalman–Bucy filter available for delayed measurements. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
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Optimal Decoupling Control Method and Its Application to a Ball Mill Coal-pulverizing System 下载免费PDF全文
The conventional optimal tracking control method cannot realize decoupling control of linear systems with a strong coupling property. To solve this problem, in this paper, an optimal decoupling control method is proposed, which can simultaneously provide optimal performance. The optimal decoupling controller is composed of an inner-loop decoupling controller and an outer-loop optimal tracking controller. First, by introducing one virtual control variable, the original differential equation on state is converted to a generalized system on output. Then, by introducing the other virtual control variable, and viewing the coupling terms as the measurable disturbances, the generalized system is open-loop decoupled. Finally, for the decoupled system, the optimal tracking control method is used. It is proved that the decoupling control is optimal for a certain performance index. Simulations on a ball mill coal-pulverizing system are conducted. The results show the effectiveness and superiority of the proposed method as compared with the conventional optimal quadratic tracking (LQT) control method. 相似文献
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设计一种新型同步发电机励磁系统,除了采用串联型PID控制算法外,还辅助以PSS、LOEC、NOEC控制算法分别用于改善电力系统小干扰稳定性、抑制各种频率的低频振荡和系统暂态稳定、静态稳定并抑制电力系统功率振荡。给出了系统硬件框图、算法和主程序流程图,并对系统运行过程进行了阐述。 相似文献