共查询到20条相似文献,搜索用时 15 毫秒
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Irwin W. Sandberg 《International Journal of Circuit Theory and Applications》2000,28(2):109-120
It is known that large classes of approximately‐finite‐memory maps can be uniformly approximated arbitrarily well by the maps of certain non‐linear structures. As an application, it was proved that time‐delay networks can be used to uniformly approximate arbitrarily well the members of a large class of causal nonlinear dynamic discrete‐time input–output maps. However, the proof is non‐constructive and provides no information concerning the determination of a structure that corresponds to a prescribed bound on the approximation error. Here we give some general results concerning the problem of finding the structure. Our setting is as follows. There is a large family 𝒢 of causal time‐invariant approximately‐finite‐memory input‐output maps G from a set S of real d‐vector‐valued discrete‐time inputs (with d⩾1) to the set of ℝ‐valued discrete‐time outputs, with both the inputs and outputs defined on the non‐negative integers 𝒵+. We show that for each ϵ>0, any Gϵ𝒢 can be uniformly approximated by a structure map H(G, ·) to within tolerance ϵ, and we give analytical results and an example to illustrate how such a H(G, ·) can be determined in principle. Copyright © 2000 John Wiley & Sons, Ltd. 相似文献
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This paper presents a design method for robust model matching control of nonminimum‐phase discrete‐time systems. This scheme can robustly control the nominal model in the presence of unmodeled dynamics and can achieve the desired model matching simultaneously. Furthermore, the sufficient condition for stabilizing the nominal model in the presence of the unmodeled dynamics is derived and the existence of bounds for all signals is proved. Finally, computer simulation results are presented to illustrate the effectiveness of the proposed method. © 1999 Scripta Technica, Electr Eng Jpn, 128(2): 36–44, 1999 相似文献
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Graciela Adriana Gonzlez 《International Journal of Adaptive Control and Signal Processing》1999,13(1):31-36
Adaptive control is applied to a particular class of SISO discrete‐time non‐linear systems. Global boundedness and convergence are obtained by introducing a modification to a classical adaptive scheme. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献
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R. Perfetti 《International Journal of Circuit Theory and Applications》1999,27(4):367-373
Some interlaced block‐sequential modes of operation are introduced for discrete‐time cellular neural networks (DTCNN), and the corresponding convergence conditions are investigated. It is proved that DTCNNs, under some block‐sequential updating rules, result to be convergent when the feedback templates satisfy some restrictions rather milder than reciprocity or dominance, as required in synchronous mode. Moreover, the set of fixed points of the network results to be independent of the particular updating rule adopted. The drawback of desynchronization is a reduced speed of convergence, which however is tolerable in the usual case when the neighbourhood radius is small. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献
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Misao Kimura Yasuyuki Miyazaki Takafumi Karube Yasuhiro Noro Choei Takahashi Hideto Kishibe Hiromichi Sato 《Electrical Engineering in Japan》2004,148(4):41-49
A digital real‐time simulator for power electronics systems has been developed using MATLABTM/SIMULINKTM. This paper describes the modeling and calculation accuracy of static synchronous compensator (STATCOM) models. Since the simulator operates in a large time step of 50 µs, compensation processing is implemented with the STATCOM model to improve the simulation accuracy. The calculation result of the real‐time STATCOM model is the same as that of non‐real‐time PSCADTM/EMTDCTM. Stable operation of the newly developed simulator was successfully confirmed when connected to a commercial real‐time digital simulator (RTDSTM). © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 148(4): 41–49, 2004; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10321 相似文献
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针对一类不确定非线性连续系统,用模糊系统对未知函数进行逼近的基础上,利用Lyapunov稳定性理论,提出了一种新的自适应模糊跟踪控制算法,此算法的特点是,无论取多少条模糊系统的规则,自适应学习的参数只有一个,便于实现,而且还能确保闭环系统渐近稳定,并使系统的跟踪误差为零,仿真研究表明,所提出的算法是有效的。 相似文献
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运用非线性系统的精确线性化方法和Lie代数工具,将一类满足一定条件的。其中一个输入控制机构特性不确定的双输入-单输出偏向型非线性系统变换直接型的鲁里叶系统,再应用鲁里叶的绝对稳定性判据,通过选择恰当的状态反馈矩阵,使所得直接型鲁里叶闭环系统绝对稳定于坐标原点,从而使得原非线性系统在给定的控制机构不确定特性范围内镇定于其平衡点,并且求得了镇定控制律的解析形式。本文在将鱼时叶理论推广到非线性情形的同时 相似文献
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Irwin W. Sandberg 《International Journal of Circuit Theory and Applications》2001,29(5):505-509
The cornerstone of the theory of discrete‐space single‐input–single‐output linear systems is the idea that every such system has an input–output map that can be represented by a convolution or the familiar generalization of a convolution. This thinking involves an oversight which, for the case of bounded inputs mapped continuously into bounded outputs, was recently corrected by adding an additional term to the representation. Here, we give a corresponding corrected result for discrete‐space systems with stochastic inputs. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
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针对一类由线性中性稳定的外系统驱动的具有未建模动态和外界扰动的非线性不确定系统的输出调节问题,结合动态面控制法和内模原理提出一种具有动态面控制的设计方法.根据非线性输出调节问题可解的必要条件,运用状态变换和标准内模将输出调节问题转化为镇定问题.运用动态面控制法将一阶滤波器引入反步设计中,避免了反步设计中所存在的"膨胀项... 相似文献
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Zhengrong XIANG Weiming XIANG 《Frontiers of Electrical and Electronic Engineering in China》2008,3(4):465-469
The backstepping method is applied to a certain class of switched nonlinear systems to design state feedback controllers and
a switching law based on multi-Lyapunov functions. The state feedback controllers and the switching law that can stabilize
the system are developed. The switched nonlinear systems with uncertainties can be stabilized robustly by using the proposedmethod.
Finally, simulation results show the effectiveness of the method.
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Translated from Control and Decision, 2007, 22(12): 1373–1376 [译自: 控制与决策] 相似文献
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Kenji Takao Toru Yamamoto Takao Hinamoto 《IEEJ Transactions on Electrical and Electronic Engineering》2006,1(4):364-373
This paper describes a new memory‐based proportional, integral, derivative (PID) controller design. These PID parameters are tuned by the IMC‐PID method, which is derived from the relationship between the internal model control (IMC) and PID control. The IMC‐PID has a user‐specified parameter that greatly influences the control performance. The authors have already proposed a system identification scheme based on the memory‐based approach. In this paper, a new controller design scheme is discussed, whose system parameters and the corresponding suitable user‐specified parameter are simultaneously computed. Finally, the behavior of the newly proposed control scheme is examined in a simulation example. © 2006 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
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This paper addresses the quantization of control systems. The state of the system is quantized by means of a quantizer. In addition, constraints on the input and/or state are considered explicitly. For a linear system with no constraints, some quantized feedback control methods have been proposed. In this paper, a control methodology for a constrained system is proposed. Specifically, the idea of a positively invariant set is introduced so that the performance is improved while the constraints are satisfied. The effectiveness of the proposed method is verified through both simulation and experiment. © 2011 Wiley Periodicals, Inc. Electr Eng Jpn, 178(3): 53–61, 2012; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.21122 相似文献
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