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利用WNN(小波神经网络)逼近未知函数,将未知离散非线性系统转化为一类参数化严格反馈系统,进而对变换后的系统给出一个避免过参数化的自适应反推控制器,并证明该控制器可保证在存在参数不确定性和函数不确定性的条件下,整个自适应系统的状态全局有界,同时也可保证系统的跟踪误差落在一个大小与不确定性成比例的紧集中,仿真结果表明该控制器具有较强的鲁棒性,可适用于不同的对象。 相似文献
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本文针对一类具有多时滞状态扰动的非线性系统,讨论了其自适应鲁棒镇定问题。在本文中,多时滞状态扰动的上界未知,通过设计自适应律估计上界的值。基于Lyapumov-Krasovskii函数设计了鲁棒控制器,使闭环系统的鲁棒镇定问题可解。一个数值例子的仿真验证了结论的正确性。 相似文献
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研究一类存在模型不确定性和外部扰动的互联机器人系统的控制问题.控制器由一般线性控制器,线性自适应控制器和非线性自适应控制器综合构成.通过Lyapunov理论证明设计的鲁棒分散自适应控制器能够有效地克服不确定性对系统的影响,实现闭环系统的渐近轨迹跟踪控制.最后给出一个仿真例子进一步验证控制器的有效性. 相似文献
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研究了一类不确定非完整动力系统的鲁棒镇定问题,设计了时变镇定律,仿真表明了该镇定律有效性。 相似文献
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针对一类带时滞状态扰动的系统,讨论了系统的鲁棒自适应镇定问题.当扰动有界且界未知时,运用自适应控制方法,设计出一类自适应控制器.采用Lyapunov_Karasovskii函数方法,证明了文中所提出的控制器可鲁棒镇定该系统. 相似文献
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一类不确定非线性系统的鲁棒自适应控制 总被引:3,自引:0,他引:3
针对一类输入带有一定的不确定性的非线性系统 ,设计了一种鲁棒自适应控制器。该控制器作用与系统 ,能保证闭环系统信号的全局有界性 ,又能使闭环系统输出任意小。 相似文献
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针对一类控制增益函数及符号均未知的不确定非线性系统,基于反推滑模设计方法,提出一种鲁棒自适应神经网络控制方案.结合Nussbaum增益设计技术和神经网络逼近能力,取消了控制增益函数及符号已知的条件,应用积分型Lyapunov函数避免了控制器奇异性问题,并通过引入神经网络逼近误差和不确定干扰上界的自适应补偿项消除了建模误差和不确定干扰的影响.理论分析证明了闭环系统所有信号半全局一致终结有界,仿真结果验证了该方法的有效性. 相似文献
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In this paper, robust adaptive control is presented for a class of parametric-strict-feedback nonlinear systems with unknown time delays. Using appropriate Lyapunov-Krasovskii functionals, the uncertainties of unknown time delays are compensated for. Controller singularity problems are solved by employing practical robust control and regrouping unknown parameters. By using differentiable approximation, backstepping design can be carried out for a class of nonlinear systems in strict-feedback form. It is proved that the proposed systematic backstepping design method is able to guarantee global uniform ultimate boundedness of all the signals in the closed-loop system and the tracking error is proven to converge to a small neighborhood of the origin. Simulation results are provided to show the effectiveness of the proposed approach. 相似文献
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B. R. Barmish P. P. Khargonekar 《Mathematics of Control, Signals, and Systems (MCSS)》1990,3(3):197-210
Recent results on a generalization of Kharitonov’s interval polynomial problem allow linearly dependent perturbations in the
coefficients of a polynomial, and the main objective is to provide computationally tractable criteria for robust stability.
In this paper robust-stability criteria are provided in an even more general setting—one which also accommodates unmodeled
dynamics. In addition, the test given for robust stability totally avoids so-called “edge combinatorics,” greatly facilitating
numerical computation.
This research was supported by the National Science Foundation under Grants ECS-8612948 and ECS-8451519 and in part by AFOSR
Grant 880020, Honeywell and GE. 相似文献
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In this paper, the robust adaptive fuzzy tracking control problem is discussed for a class of perturbed strict-feedback nonlinear systems. The fuzzy logic systems in Mamdani type are used to approximate unknown nonlinear functions. A design scheme of the robust adaptive fuzzy controller is proposed by use of the backstepping technique. The proposed controller guarantees semi-global uniform ultimate boundedness of all the signals in the derived closed-loop system and achieves the good tracking performance. The possible controller singularity problem which may occur in some existing adaptive control schemes with feedback linearization techniques can be avoided. In addition, the number of the on-line adaptive parameters is not more than the order of the designed system. Finally, two simulation examples are used to demonstrate the effectiveness of the proposed control scheme. 相似文献
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This paper, presents a robust adaptive control method for a class of nonlinear non-minimum phase systems with uncertainties. The development of the control method comprises two steps. First, stabilization of the system is considered based on the availability of the output and internal dynamics of the system. The reference signal is designed to stabilize the internal dynamics with respect to the output tracking error. Moreover, a combined neuro-adaptive controller is proposed to guarantee asymptotic stability of the tracking error. Then, the overall stability is achieved using the small gain theorem. Next, the availability of internal dynamics is relaxed by using a linear error observer. The unmatched uncertainty is compensated using a suitable reference signal. The ultimate boundedness of the reconstruction error signals is analytically shown using an extension of the Lyapunov theory. The theoretical results are applied to a translational oscillator/rotational actuator model to illustrate the effectiveness of the proposed scheme. 相似文献
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In this paper, the robust adaptive fuzzy tracking control problem is discussed for a class of perturbed strict-feedback nonlinear systems. The fuzzy logic systems in Mamdani type are used to approximate unknown nonlinear functions. A design scheme of the robust adaptive fuzzy controller is proposed by use of the backstepping technique. The proposed controller guarantees semi-global uniform ultimate boundedness of all the signals in the derived closed-loop system and achieves the good tracking performance. The possible controller singularity problem which may occur in some existing adaptive control schemes with feedback linearization techniques can be avoided. In addition, the number of the on-line adaptive parameters is not more than the order of the designed system. Finally, two simulation examples are used to demonstrate the effectiveness of the proposed control scheme. 相似文献
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Kuang-Chiung Chang Hung-Ching Lu 《Mathematics of Control, Signals, and Systems (MCSS)》1990,3(1):81-96
In this paper, robust stabilization conditions based on theH
∞-norm are derived for multivariable feedback systems under perturbations and constrained control. The parametrized controller
of Youlaet al. is employed to treat this problem. In addition, a necessary and sufficient condition is derived for the solvability of the
synthesis problem for a controller which achieves robust stability. Finally, a design procedure is proposed for selecting
the parameters of the robust controller, and an illustrative example is given. 相似文献
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S. Yang X. Zhengrong C. Qingwei H. Weili 《International journal of systems science》2013,44(15):1077-1087
This paper is concerned with reliable control problems for the switched uncertain systems with time varying delay. A method for designing robust reliable controller is presented by means of the multiple Lyapunov functions technique so that the energy-like functional does not have to decrease along the switching instants. The proposed controller is reliable in that it can guarantee the closed loop asymptotic stablility of switched delay systems in the case of the possible presence of failures of partial actuators. Delay independent results of the reliable controller design are presented in terms of Linear Matrix Inequalities (LMIs). Finally, a numerical example is given to illustrate the applicability of the proposed results. 相似文献