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1.
本文研究变周期采样的网络控制系统模型的随机最优反馈控制。假设网络诱导延时服从某一个区间的均匀分布,设计一个依赖延时的状态反馈控制器,使得所建立的变周期采样的NCS模型指数均方稳定。利用动态规划思想结合Bellman方程通过优化所给定的性能指标,得到了随机最优反馈控制器设计方法,并通过仿真实例验证了本章提出方法的有效性。 相似文献
2.
We studied the response of harmonically and stochastically excited strongly nonlinear oscillators with delayed feedback bang-bang control using the stochastic averaging method. First, the time-delayed feedback bang-bang control force is expressed approximately in terms of the system state variables without time delay. Then the averaged It6 stochastic differential equations for the system are derived using the stochastic averaging method. Finally, the response of the system is obtained by solving the Fokker-Plank-Kolmogorov （FPK） equation associated with the averaged lt6 equations. A Duffing oscillator with time-delayed feedback bang-bang control under combined harmonic and white noise excitations is taken as an example to illus- trate the proposed method. The analytical results are confirmed by digital simulation. We found that the time delay in feedback bang-bang control will deteriorate the control effectiveness and cause bifurcation of stochastic jump of Duffing oscillator. 相似文献
3.
针对控制系数未知的一类时滞链式系统,基于State-scaling变换技巧和Backstepping方法,通过构造积分型Lyapunov-Krasovskil泛函巧妙处理时滞项,设计鲁棒控制器,保证闭环系统的所有状态渐近稳定． 相似文献
4.
考虑一类含有范数有界参数不确定性和混合时滞的中立型系统的严格正实状态反馈控制问题,利用线性矩阵不等式(LMI),给出了状态反馈控制器存在的充分条件,使得对所有的参数不确定性,闭环系统是鲁棒稳定且扩展严格正实的;并得到了控制器的设计方法,数值例子表明了设计方法的有效性。 相似文献
5.
Xue-ping LI Wei-qiu ZHU Zu-guang YING 《浙江大学学报(A卷英文版)》2008,9(3):330-337
An optimization method for time-delayed feedback control of partially observable linear building structures subjected to seismic excitation is proposed. A time-delayed control problem of partially observable linear building structure under horizontal ground acceleration excitation is formulated and converted into that of completely observable linear structure by using separation principle. The time-delayed control forces are approximately expressed in terms of control forces without time delay. The control system is then governed by Itoe stochastic differential equations for the conditional means of system states and then transformed into those for the conditional means of modal energies by using the stochastic averaging method for quasi-Hamiltonian systems. The control law is assumed to be modal velocity feedback control with time delay and the unknown control gains are determined by the modal performance indices. A three-storey building structure is taken as example to illustrate the proposal method and the numerical results are confirmed by using Monte Carlo simulation. 相似文献
6.
针对一类含有非线性参数的非线性时滞系统．利用参数分离技术和后推方法,提出了一种自适应状态反馈控制方案,保证闭环系统的所有信号全局一致有界。通过构造Lyapunov—Krasoviskii泛函证明了系统的状态能收敛到零的一个小邻域内。 相似文献
7.
运用李亚普诺夫函数,设计所需状态反馈控制器,研究了具有分布时滞的中立型随机时滞系统的H∞控制,给出了H∞控制器存在的充分条件,使所得到的闭环系统均方渐近稳定,且满足所需要的H∞性能指标. 相似文献
8.
马新 《临沂师范学院学报》2009,31(3):33-37,41
考虑了一类永磁同步电动机的有限时间跟踪控制问题．在控制器设计中利用中继切换控制使系统在给定的当前控制律的作用下运行到某一特定状态（或某一特定区域）后,控制律被切换到有限时间收敛的终端滑模控制器,使得系统在有限时间内达到平衡状态．有限时间跟踪控制器的设计保证了闭环系统所有信号的有界性和平衡点的全局稳定性,以及系统在有限时间内精确地跟踪给定的参考信号．最后通过一个数值仿真验证了所提算法的正确有效性． 相似文献
9.
针对不确定时滞的奇异系统H8状态反馈控制,基于线性矩阵不等式方法(LMI)及Lyapunov稳定性理论导出使得奇异系统鲁棒可镇定且具有H8范数界γ的一个充分条件,并用线性矩阵不等式给出状态反馈控制器设计方法。数值例子证明了该方法的有效性。 相似文献
10.
For linear switched system with both parameter uncertainties and time delay,a delay-dependent sufficient condition for the existence of a new robust H∞ feedback controller was formulated in nonlinear matrix inequalities solvable by an LMI-based iterative algorithm.Compared with the conventional state-feedback controller,the proposed controller can achieve better robust control performance since the delayed state is utilized as additional feedback information and the parameters of the proposed controllers are changed synchronously with the dynamical characteristic of the system.This design method was also extended to the case where only delayed state is available for the controller.The example of balancing an inverted pendulum on a cart demonstrates the effectiveness and applicability of the proposed design methods. 相似文献
11.
“自动控制原理”课程中状态反馈及状态重构部分内容繁杂不易理解。为使学生加深理解该部分内容,以二阶系统为例,对基于状态反馈及状态重构原理的系统校正给出了具体的模拟电子电路设计方案,并通过Simulink工具对实验过程进行仿真,仿真结果表明本文所做的电路设计是有效的。 相似文献
12.
针对一类具有时变状态时滞和参数不确定性的线性不确定时滞系统,研究了闭环极点具有α-稳定性限制的鲁棒H∞控制器设计问题.对所有容许的不确定,首先给出判断系统鲁棒α-稳定且具有干扰衰减γ的充分条件;而后基于线性矩阵不等式方法,分别提出了状态反馈和动态输出反馈控制器存在的充分条件及相应的控制器设计方法.数值算例验证了所给结果的有效性. 相似文献
13.
讨论了一类基于T-S模糊模型的非线性系统,根据满意控制思想提出一种条件约束下的状态反馈控制设计方法。即在H∞控制基础上,加入圆形极点指标和状态协方差指标约束。进而研究了圆形极点约束和状态协方差约束下,系统被控输出对扰动输入的H∞抑制界优化问题,并且将H∞优化、圆形极点和状态协方差指标约束的状态反馈控制器设计归结为求一组线性矩阵不等式(LMI)的可行解问题,通过求解LMI得到满足要求的控制器参数。仿真结果表明该方法可行有效。 相似文献
14.
研究了一类含有时滞的链式系统的鲁棒控制问题.基于State-sealing变换技巧和Backstepping方法,通过构造积分型Lyapunov-Krasovskii泛函设计控制器保证闭环系统的所有状态渐近稳定. 相似文献
15.
For linear switched system with both parameter uncertainties and time delay, a delay-dependent sufficient condition for the
existence of a new robustH
∞ feedback controller was formulated in nonlinear matrix inequalities solvable by an LMI-based iterative algorithm. Compared
with the conventional state-feedback controller, the proposed controller can achieve better robust control performance since
the delayed state is utilized as additional feedback information and the parameters of the proposed controllers are changed
synchronously with the dynamical characteristic of the system. This design method was also extended to the case where only
delayed state is available for the controller. The example of balancing an inverted pendulum on a cart demonstrates the effectiveness
and applicability of the proposed design methods.
Project (No. 2002CB312200) supported by the National Basic Research Program (973) of China 相似文献
16.
基于状态观测器研究具有数据丢失的线性离散系统的H∞输出反馈控制问题,采用满足Bernoulli分布的序列来描述网络传输数据的丢失,预先假设数据丢失的概率,然后采用线性矩阵不等式（LMI）方法设计状态观测器和输出反馈控制器使得系统均方指数稳定并具有给定的H∞性能,最后用数值仿真验证设计方法的有效性。 相似文献
17.
We investigate the best performance for linear feedback control systems in the case that plant uncertainty is to be considered. First, we define an average integral square criterion of tracking error over a class of stochastic model errors. By utilizing spectral factorization to minimize the performance index, we derive an optimal controller design method and further study best performance in the presence of stochastic perturbation. The results can be used to evaluate optimal performance in practical control system designs. 相似文献
18.
《教育实用测度》2013,26(4):255-268
The study applied a psychometric model-the rule-space model-to diagnose students' states of knowledge about how the exponents behave in multiplication and division of quantities with exponents. A 38-item test was administered to 431 Grade 10 students. Each item was characterized by a list of task attributes required for answering the item correctly, and each student was classified, based on his or her item-score pattern, into the most likely knowledge, state (i.e., attribute-mastery pattern) corresponding to an ideal item-score pattern. The following outcomes of the rule-space model were presented: (a) the results of the classification of examinees to knowledge states at the group level along with individual examples, (b) the mastery level of the underlying task attributes as evaluated at three different test-score groups, and (c) a tree diagram of the transitional relationships among the knowledge states that can guide the design of effective remediation. Implications for utilizing the feedback, provided by the rule-space model in the context of instruction and assessment are discussed. 相似文献
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针对输入更新不等间隔的非一致采样系统,提出一种基于状态观测器的状态反馈预测控制算法．通过提升控制信号,设计了输入输出同周期的非一致采样系统的状态观测器,并且给出了提升控制信号前后观测器系数矩阵的关系．运用线性矩阵不等式方法,解决无穷时域二次型性能指标下的优化问题,给出了状态反馈预测控制器存在的充分条件．仿真结果证明了控制算法的有效性． 相似文献