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Zhengqiang Zhang Shengyuan Xu Yu Guo Yuming Chu 《International Journal of Adaptive Control and Signal Processing》2010,24(9):743-759
A robust adaptive output‐feedback control scheme is proposed for a class of nonlinear systems with unknown time‐varying actuator faults. Additional unmodelled terms in the actuator fault model are considered. A new linearly parameterized model is proposed. The boundedness of all the closed‐loop signals is established. The desired control performance of the closed‐loop system is guaranteed by appropriately choosing the design parameters. The properties of the proposed control algorithm are demonstrated by two simulation examples. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
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Chun‐Hua Xie Guang‐Hong Yang 《International Journal of Adaptive Control and Signal Processing》2017,31(2):223-239
This paper investigates the robust adaptive fault‐tolerant control problem for state‐constrained continuous‐time linear systems with parameter uncertainties, external disturbances, and actuator faults including stuck, outage, and loss of effectiveness. It is assumed that the knowledge of the system matrices, as well as the upper bounds of the disturbances and faults, is unknown. By incorporating a barrier‐function like term into the Lyapunov function design, a novel model‐free fault‐tolerant control scheme is proposed in a parameter‐dependent form, and the state constraint requirements are guaranteed. The time‐varying parameters are adjusted online based on an adaptive method to prevent the states from violating the constraints and compensate automatically the uncertainties, disturbances, and actuator faults. The time‐invariant parameters solved by using data‐based policy iteration algorithm are introduced for helping to stabilize the system. Furthermore, it is shown that the states converge asymptotically to zero without transgression of the constraints and all signals in the resulting closed‐loop system are uniformly bounded. Finally, two simulation examples are provided to show the effectiveness of the proposed approach. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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D. Xu S. X. Ding Y. Wang L. Li 《International Journal of Adaptive Control and Signal Processing》2017,31(1):23-38
This paper addresses a study of fault‐tolerant control (FTC) for wireless networked control systems (WNCSs) in industrial automatic processes. The WNCSs is composed of many subsystems, which operate with different sampling cycles. In order to meet the real‐time requirements and ensure a deterministic data transmission, the time division multiple access (TDMA) mechanism is adopted in WNCSs. The data in WNCSs are transmitted following a TDMA‐based scheduler. According to the periodicity, WNCSs integrated with the scheduler is first formulated as discrete linear time periodic systems (LTPSs). Afterwards, a fault estimation method for LTPSs is developed under a H∞ performance specification with a regional pole constraint. With the achieved state observer and fault estimator, an FTC strategy for LTPSs is explored. Finally, the proposed methods are verified on a physical experimental WiNC platform. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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M. Davoodi N. Meskin K. Khorasani 《International Journal of Adaptive Control and Signal Processing》2017,31(12):1903-1919
In this paper, the problem of integrated fault detection, isolation, and control design of continuous‐time Markovian jump linear systems with uncertain transition probabilities is introduced and addressed for the first time in the literature. A single Markovian jump module designated as the integrated fault detection, isolation, and control under a mixed robust framework is considered to simultaneously achieve the desired detection, isolation, and control objectives. Conventional mixed robust approaches to the fault detection and isolation problem lead to conservative results due to the selection of identical Lyapunov matrices. Consequently, the extended linear matrix inequality methodology is utilized in this work to reduce the conservativeness of standard approaches by introducing additional matrix variables so that the coupling of Lyapunov matrices with the system matrices is eliminated. Simulation results for an application to the GE F‐404 aircraft engine system illustrate the effectiveness and capabilities of our proposed design methodologies. Comparisons with relevant work in the literature are also provided to demonstrate the advantages of our proposed solutions. 相似文献
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为了研究带二次不确定参数线性系统的鲁棒够稳定和鲁棒镇定问题,考虑了D域为复平面左半平面的圆盘域,并采用线性矩阵不等式（LMI）方法,证明该系统鲁棒D稳定的充分条件等价于一个线性矩阵不等式的可解性问题,利用该LMI的可行解可求得了系统鲁棒镇定状态反馈控制器。通过实例说明了该方法的有效性。 相似文献
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P. Krishnamurthy F. Khorrami 《International Journal of Adaptive Control and Signal Processing》2016,30(5):690-714
A general class of uncertain nonlinear systems with dynamic input nonlinearities is considered. The system structure includes a core nominal subsystem of triangular structure with additive uncertain nonlinear functions, coupled uncertain nonlinear appended dynamics, and uncertain nonlinear input unmodeled dynamics. The control design is based on dual controller/observer dynamic high‐gain scaling with an additional dynamic scaling based on a singular perturbation‐like redesign to address the non‐affine and uncertain nature of the input appearance in the system dynamics. The proposed approach yields a constructive global robust adaptive output‐feedback control design that is robust to the dynamic input uncertainties and to uncertain nonlinear functions allowed throughout the system structure. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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Shreekant Gayaka Bin Yao 《International Journal of Adaptive Control and Signal Processing》2011,25(11):965-982
In this paper, we solve the problem of output tracking for linear uncertain systems in the presence of unknown actuator failures using discontinuous projection‐based output feedback adaptive robust control (ARC). The faulty actuators are characterized as unknown inputs stuck at unknown values experiencing bounded disturbance and actuators losing effectiveness at unknown instants of time. Many existing techniques to solve this problem use model reference adaptive control (MRAC), which may not be well suited for handling various disturbances and modeling errors inherent to any realistic system model. Robust control‐based fault‐tolerant schemes have guaranteed transient performance and are capable of dealing with modeling errors to certain degrees. But, the steady‐state tracking accuracy of robust controllers, e.g. sliding mode controller, is limited. In comparison, the backstepping‐based output feedback adaptive robust fault‐tolerant control (ARFTC) strategy presented here can effectively deal with such uncertainties and overcome the drawbacks of individual adaptive and robust controls. Comparative simulation studies are performed on a linearized Boeing 747 model, which shows the effectiveness of the proposed scheme. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
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Meysam Yadegar Nader Meskin Wassim M. Haddad 《International Journal of Adaptive Control and Signal Processing》2019,33(6):943-955
In this paper, we present a control design framework wherein an adaptive‐based corrective signal is augmented to the output of the nominal controller in order to suppress or counteract the effect of malicious actuator attacks. Due to the unavailability of full‐state measurements, a nonminimal controllable realization of the nominal closed‐loop system is used to design the corrective signal predicated on partial state information. Two illustrative numerical examples are given to demonstrate the efficacy of the proposed adaptive control architecture. 相似文献
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P. Krishnamurthy F. Khorrami 《International Journal of Adaptive Control and Signal Processing》2003,17(4):285-311
Design of global robust adaptive output‐feedback dynamic compensators for stabilization and tracking of a class of systems that are globally diffeomorphic into systems in generalized output‐feedback canonical form is investigated. This form includes as special cases the standard output‐feedback canonical form and various other forms considered previously in the literature. Output‐dependent non‐linearities are allowed to enter both additively and multiplicatively. The system is allowed to contain unknown parameters multiplying output‐dependent non‐linearities and, also, unknown non‐linearities satisfying certain bounds. Under the assumption that a constant matrix can be found to achieve a certain property, it is shown that a reduced‐order observer and a backstepping controller can be designed to achieve practical stabilization of the tracking error. If this assumption is not satisfied, it is shown that the control objective can be achieved by introducing additional dynamics in the observer. Sufficient conditions under which asymptotic tracking and stabilization can be achieved are also given. This represents the first robust adaptive output‐feedback tracking results for this class of systems. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
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P. Krishnamurthy F. Khorrami 《International Journal of Adaptive Control and Signal Processing》2008,22(1):23-42
We propose an adaptive output‐feedback controller for a general class of nonlinear triangular (strict‐feedback‐like) systems. The design is based on our recent results on a new high‐gain control design approach utilizing a dual high‐gain observer and controller architecture with a dynamic scaling. The technique provides strong robustness properties and allows the system class to contain unknown functions dependent on all states and involving unknown parameters (with no magnitude bounds required). Unlike our earlier result on this problem where a time‐varying design of the high‐gain scaling parameter was utilized, the technique proposed here achieves an autonomous dynamic controller by introducing a novel design of the observer, the scaling parameter, and the adaptation parameter. This provides a time‐invariant dynamic output‐feedback globally asymptotically stabilizing solution for the benchmark open problem proposed in our earlier work with no magnitude bounds or sign information on the unknown parameter being necessary. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
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S. M. Hoseini M. Farrokhi A. J. Koshkouei 《International Journal of Adaptive Control and Signal Processing》2010,24(1):65-82
This paper presents an adaptive output feedback stabilization method based on neural networks (NNs) for nonlinear non‐minimum phase systems. The proposed controller comprises a linear, a neuro‐adaptive, and an adaptive robustifying parts. The NN is designed to approximate the matched uncertainties of the system. The inputs of the NN are the tapped delays of the system input–output signals. In addition, an appropriate reference signal is proposed to compensate the unmatched uncertainties inherent in the internal system dynamics. The adaptation laws for the NN weights and adaptive gains are obtained using Lyapunov's direct method. These adaptation laws employ a linear observer of system dynamics that is realizable. The ultimate boundedness of the error signals are analytically shown using Lyapunov's method. The effectiveness of the proposed scheme is shown by applying to a translation oscillator rotational actuator model. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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Tian Si Lijun Long 《International Journal of Adaptive Control and Signal Processing》2019,33(5):784-801
This paper investigates the problem of adaptive output‐feedback neural network (NN) control for a class of switched pure‐feedback uncertain nonlinear systems. A switched observer is first constructed to estimate the unmeasurable states. Next, with the help of an NN to approximate the unknown nonlinear terms, a switched small‐gain technique‐based adaptive output‐feedback NN control scheme is developed by exploiting the backstepping recursive design scheme, input‐to‐state stability analysis, the common Lyapunov function method, and the average dwell time (ADT) method. In the recursive design, the difficulty of constructing an overall Lyapunov function for the switched closed‐loop system is dealt with by decomposing the switched closed‐loop system into two interconnected switched systems and constructing two Lyapunov functions for two interconnected switched systems, respectively. The proposed controllers for individual subsystems guarantee that all signals in the closed‐loop system are semiglobally, uniformly, and ultimately bounded under a class of switching signals with ADT, and finally, two examples illustrate the effectiveness of theoretical results, which include a switched RLC circuit system. 相似文献
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有源电力滤波器系统中含有未知的不确定性问题,在其运行中负载发生变化,影响系统稳定性,致使原有控制效率降低。为提高系统抗干扰能力,增强系统鲁棒性,笔者针对包含不确定干扰的系统数学模型,基于H_∞控制理论,采用线性矩阵不等式的鲁棒控制器设计方法,设计了单相并联有源电力滤波器H∞输出反馈控制器。该控制器可在2～3个周波内将电网28.93%的畸变率补偿在3%以内,并且在负载电流发生变化时,仍可实现快速的动态补偿和高精度的稳态补偿。通过仿真实验,证明了该控制器不仅可以保证闭环系统稳定,同时还具有良好的动态补偿效果和较强的鲁棒性。 相似文献
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复杂网络的研究已经渗透到许多科学领域,从物理学、生物神经学到工程学与社会科学等都有着重要的应用.在实际网络中,节点很有可能存在时间滞后,因此,本文引入了一类时滞动态复杂网的模型,并且研究了它的同步特性.假设存在一个不稳定的固定点,分别采用时滞反馈控制和标准反馈控制,首先得到系统的误差方程,然后应用线性矩阵不等式(LMI)方法,基于李亚普诺夫稳定性定理,给出了误差方程稳定的充分条件.数值举例和仿真结果显示误差系统逐渐趋于稳定. 相似文献
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Ying Zhang Guangren Duan Liyan Chen 《Frontiers of Electrical and Electronic Engineering in China》2009,4(2):193-198
For a class of discrete-time switched systems with norm-bounded uncertainties and a quadratic cost index, the problem of designing
a guaranteed cost state feedback controller with pole constraints is considered. A sufficient condition on the existence of
robust guaranteed controllers is derived by a quadratic Lyapunov function approach together with linear matrix inequality
(LMI) technique. Based on a constructed switching law, the closed-loop system is quadratic D-stable and the closed-loop cost
function value is not more than a specified upper bound. Furthermore, the design of suboptimal guaranteed cost controllers
is turned into a convex optimization problem with linear matrix inequalities constraints. A numerical example demonstrates
the effect of the proposed design approach.
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Translated from Control and Decision, 2007, 22(11): 1269–1273 [译自: 控制与决策] 相似文献
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不确定线性系统鲁棒容错控制器的设计 总被引：6，自引：0，他引：6
研究了范数有界参数摄动情况下的不确定线性系统的鲁棒容错控制问题。采用代数的方法给出了在不确定线性系统同时存在执行器失效的情况下，闭环系统具有鲁棒性和完整性的一个充分条件。同时应用线性矩阵不等式方法给出了线性不确定系统对执行器失效具有完整性的设计方法。数值算例表明文中给出的两种算法具有简单有效的特点。 相似文献
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Ligang Wu James Lam 《International Journal of Adaptive Control and Signal Processing》2008,22(10):909-931
This paper is concerned with the sliding mode control of a continuous‐time switched system with time‐varying delay in its state. By using the average dwell time approach and the piecewise Lyapunov function technique, a sufficient condition is first proposed to guarantee the exponential stability of the unforced system with the decay estimate explicitly given. A sufficient condition of the existence of a reduced‐order sliding mode dynamics is derived, and an explicit parametrization of the desired sliding surface is also given. The obtained conditions will be solved using the cone complementary linearization (CCL) method. An adaptive sliding mode controller for the reaching motion is then designed such that the trajectories of the resulting closed‐loop system can be driven onto a prescribed sliding surface and maintained there for all subsequent times. All the conditions obtained in this paper are delay dependent. Finally, two numerical examples are given to illustrate the effectiveness of the proposed theory. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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灵活交流输电(Flexible AC Transmission System,FACTS)装置在电力系统中应用广泛,开展基于广域测量系统(Wide-area Measurement System,WAMS)的多FACTS协调控制研究是未来FACTS发展的主要方向之一。建立了广域集中协调控制架构,采用动态输出反馈控制结构,利用凸多面体的微分包含理论,提出了一种适用于多种工况的多FACTS协调控制算法;针对WAMS信号存在的固有时滞特性分析了算法的时滞裕度,使得算法在裕度范围内均可保证系统稳定运行。最后含SVC和TCSC的多机算例验证了所提算法,表明算法在多种工况中均表现出较好的控制效果,保证系统在强阻尼模式下运行。 相似文献