共查询到20条相似文献,搜索用时 15 毫秒
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Kaveh Moezzi Ahmadreza Momeni Amir G. Aghdam 《International Journal of Adaptive Control and Signal Processing》2010,24(1):1-11
In this paper, an adaptive switching control algorithm is proposed for the stabilization of uncertain discrete‐time systems with time‐varying delay. It is assumed that the time delay is unknown and time varying, nonetheless bounded with a known bound. It is supposed that the system is highly uncertain, and that a set of controllers are designed (off‐line) to stabilize the system in the whole uncertain parameter space; subsequently, a switching scheme is developed to stabilize the uncertain time‐delay system. A thorough stability analysis for the uncertain time‐delay system under the mentioned control scheme is provided. Furthermore, an upper bound on the allowable rate of change of the system parameters and delay is obtained. Simulation results are presented to show the efficacy of the proposed switching scheme. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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Chang Tan Gang Tao Ruiyun Qi 《International Journal of Adaptive Control and Signal Processing》2014,28(11):1290-1298
This paper develops an extended model reference adaptive control scheme to expand the capacity of state feedback state tracking adaptive control to handle the plant‐model matching uncertainties for single‐input LTI systems. The extended scheme is developed, using multiple reference model systems (only one of which is required to be able to match the controlled plant), and multiple controllers (which are updated from adaptive laws generated from multiple reference model systems based estimation errors), as two key features of such design to relax a plant‐model matching condition. A switching mechanism is constructed using those multiple estimation errors, capable of selecting the suitable control input from the multiple control signals, to achieve the desired system performance. An aircraft flight control example is presented to show the capacity of such design in relaxing a practical design condition. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
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Aldo Jonathan Muoz‐Vzquez Juan Diego Snchez‐Torres Vicente Parra‐Vega Anand Snchez‐Orta Fernando Martínez‐Reyes 《International Journal of Adaptive Control and Signal Processing》2019,33(6):890-899
This paper aims at designing a contour tracking scheme based on an adaptive velocity field formulation, for the case of uncertain nonholonomic (differential drive) mobile robots, with its dynamic controller. First, to handle kinematic uncertainties that deviate the map of the velocity field into wheel velocities, a linear parameterization of the uncertain Jacobian operator is proposed to synthesize an adaptive kinematic controller that shapes correctly the velocity field. Then, a robust model‐free dynamic controller is proposed to compensate in finite time for uncertain dynamics and disturbances, enforcing the kinematic reference. Finally, a representative simulation study is discussed to show the reliability of the proposed scheme. 相似文献
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Yuanqing Xia Jie Chen Guo‐Ping Liu Lin Wang David Rees 《International Journal of Adaptive Control and Signal Processing》2009,23(9):863-881
This paper is devoted to robust adaptive sliding mode control for time‐delay systems with mismatched parametric uncertainties. Sufficient conditions for the existence of linear sliding surfaces are given in terms of linear matrix inequalities, by which the corresponding adaptive reaching motion controller is also designed. Simulation studies show the effectiveness of the control scheme. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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对主干线的分布式和集中型自愈控制方案,分别介绍了其处理逻辑流程,总结了各自的优点、缺点。针对主干线分布式和集中型自愈控制方案的优缺点,考虑IEC61850在自愈控制方案中的应用,提出了一种改进型自愈控制方案。该方案对于故障诊断、定位和隔离采用和分布式自愈控制相同的逻辑流程,对存在多恢复方案的故障下游失电负荷的供电恢复采用执行故障处理预案的方式。故障处理预案在主站事先定义好,并通过IEC61850通信规约下发到相应的智能配网终端,由智能配网终端在故障恢复时判断当前电网状态后执行相应的故障处理预案,实现故障下游负荷的供电恢复。该改进型自愈控制方案集中了分布式和集中型自愈控制方案的优点,同时避免了其缺点和不足之处。理论分析和工程应用表明,提出的改进型自愈控制方案具有较强的工程实用性。 相似文献
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IEEE 1588协议实现在配电网中网络测量和控制系统的时钟同步,并在基于分组的网络同步机制中起了重要作用。然而,传统的IEEE 1588同步算法的性能由于非对称链路和随机延迟问题的影响,达不到期望的精度。提出了基于IEEE 1588的时钟同步改进方案涉及到两种不同的随机延迟模型,分别服从高斯延迟模型和指数延迟模型。并分别推导出该方案中两种时间延迟模型的时钟偏移的最大似然估计值。分析结果表明,时钟偏移估计的性能依赖于随机延迟的模型和所发送的数据包大小的比率。仿真结果表明,该方案解决了非对称链路和随机延迟的问题,与传统的IEEE 1588时钟同步方法以及突发脉冲传输方案相比具有更好的性能。 相似文献
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Amir Naderolasli Mahnaz Hashemi Khoshnam Shojaei 《International Journal of Adaptive Control and Signal Processing》2020,34(3):298-313
An observer-based adaptive fuzzy backstepping approach is proposed for nonlinear systems with respect to fractional-order differential equations, unmatched uncertainties, unmeasured states, and actuator faults. The approximation capability of fuzzy logic system and minimal learning parameter approaches are applied to identify uncertain functions in a simultaneous manner. For estimating the unavailable conditions, a fuzzy fractional-order state-observer is extended. Applying fault-tolerant approach in a backstepping design methodology would provide a new fault-tolerant adaptive fuzzy output-feedback approach for fractional-order strict-feedback systems. This control structure would assure the considered system stability through selection of the appropriate Lyapunov candidate function. Two numerical simulations are run to exhibit the validity herein. 相似文献
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Kaveh Moezzi Amir G. Aghdam 《International Journal of Adaptive Control and Signal Processing》2013,27(9):771-780
In this paper, a new adaptive robust stabilization scheme is proposed for uncertain neutral time‐delay systems. No upper bounds on the uncertainties are assumed to be available. An update law is first used to find estimates of these upper bounds. A state‐feedback controller is then designed, which is shown to stabilize the underlying system under some mild conditions. The asymptotic stability of the state trajectories is proved using the Lyapunov–Krasovskii approach. An example is provided, which demonstrates the efficacy of the proposed adaptive control scheme. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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电力市场环境下,电价已日益成为市场参与者关注的焦点。准确的电价预测能为各参与者提供重要的参考。国内外对于电价预测的方法有很多。引用国内外相关理论对现有ARIMA预测模型进行了改进。在现有ARIMA电价预测模型的基础上,采用游程检验法判断电价序列的平稳性,采用AIC准则确定ARMA模型的阶数,在误差预测中,借助统计学的区间估计理论,给出了一种含置信区间的电价预测方法,更好地确定了电价序列的上下限,为发电商的竞价提供参考。 相似文献
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Lingrong Xue Zhen-Guo Liu Yuqiang Wu 《International Journal of Adaptive Control and Signal Processing》2020,34(7):857-876
This article studies the robust adaptive tracking control problem of nontriangular nonlinear systems that are affected by multiple state delays rather than the input-delay. Different from the related studies, the considered systems involve input dead-zone and various uncertainties arising in the control coefficients, structure parameters, time delays, and disturbances. A new adaptive control strategy is presented by introducing a dynamic-gain-based Lyapunov-Krasovskii functional and by generalizing the tuning function method in the framework of time-delay system theory. All the states of the closed-loop system are bounded and the tracking error can be adjusted sufficiently small. In the simulation, the delayed chemical system is studied to demonstrate the validity of the strategy. 相似文献
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Boris M. Mirkin Per‐Olof Gutman 《International Journal of Adaptive Control and Signal Processing》2005,19(8):639-660
Exact decentralized output‐feedback Lyapunov‐based designs of direct model reference adaptive control (MRAC) for linear interconnected delay systems with MIMO subsystems are introduced. The design process uses a co‐ordinated decentralized structure of adaptive control with reference model co‐ordination which requires an exchange of signals between the different reference models. It is shown that in the framework of the reference model co‐ordination zero residual tracking error is possible, exactly as in the case with SISO subsystems. We develop decentralized MRAC on the base of a priori information about only the local subsystems gain frequency matrices without additional a priori knowledge about the full system gain frequency matrix. To achieve a better adaptation performance we propose proportional, integral time‐delayed adaptation laws. The appropriate Lyapunov–Krasovskii type functional is suggested to design the update mechanism for the controller parameters, and in order to prove stability. Two different adaptive DMRAC schemes are proposed, being the first asymptotic exact zero tracking results for linear interconnected delay systems with MIMO subsystems. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
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Daniela J. López‐Araujo Arturo Zavala‐Río Víctor Santibáñez Fernando Reyes 《International Journal of Adaptive Control and Signal Processing》2015,29(2):180-200
In this work, a generalized adaptive scheme for the global motion control of robot manipulators with constrained inputs is proposed. It gives rise to various families of bounded adaptive controllers defined through a general class of saturation functions. Compared with adaptive tracking control algorithms previously developed in a bounded input context, the proposed adaptive approach guarantees the motion control objective for any initial condition, avoiding discontinuities throughout the scheme, preventing the inputs to reach their natural saturation bounds, and permitting innovation on the saturating structure through its generalized form, giving a wide range of possibilities for performance improvement. Experimental results corroborate the efficiency of the proposed scheme. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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Active fault‐tolerant control for near space vehicles based on reference model adaptive sliding mode scheme
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Jing Zhao Bin Jiang Fahmida N. Chowdhury Peng Shi 《International Journal of Adaptive Control and Signal Processing》2014,28(9):765-777
In this paper, an adaptive sliding mode (ASM) scheme is proposed for fault identification and fault‐tolerant control of near space vehicles (NSVs). First, the attitude dynamic model is introduced, and a baseline controller based on reference sliding mode scheme is designed in the case of no faults. Then fault parameterizations with actuator dynamics is presented for several classes of faults: lock‐in‐place, float, hard‐over, and loss of effectiveness. On the basis of adaptive observer design, fault parameters can be accurately estimated on‐line. Furthermore, an ASM fault‐tolerant controller is designed for both cases of actuator dynamic faults and control effector damage. Finally, simulation experiments show that the proposed ASM scheme is able to quickly and accurately identify faults and reconfigure the controller, resulting in excellent overall system performance. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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F. Caccavale M. Iamarino F. Pierri V. Tufano 《International Journal of Adaptive Control and Signal Processing》2008,22(7):627-651
In this paper an adaptive controller–observer temperature control scheme is developed for a class of irreversible non‐chain reactions taking place in batch reactors. The scheme is based on a nonlinear observer for the estimation of the heat released by the reaction, where the heat transfer coefficient is adaptively estimated. Tracking of the desired reactor temperature is achieved via a two‐loop control scheme, where an independent adaptive estimate of the heat transfer coefficient is used as well. Remarkably, the observer and the controller can be designed and tuned separately. The convergence of both the nonlinear observer and of the overall controller–observer scheme is analyzed by resorting to a Lyapunov‐like argument. A comparative simulation case study is developed to test the performance of the proposed scheme and compare it with other approaches already known in the literature. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
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Wanli Guo Wenqiang Luo Wennuo He 《International Journal of Adaptive Control and Signal Processing》2020,34(11):1611-1624
In this article, the synchronization problem for nonlinear hybrid-coupled complex networks with both coupling and internal self-feedback delays is studied. An aperiodically intermittent adaptive control is employed for a fraction of nodes to pin the whole network to the synchronization state. Some sufficient conditions for realizing global synchronization are derived based on Halanay inequality and Lyapunov stability theory. Finally, a simulation example verifies the effectiveness of the proposed control method. 相似文献