共查询到19条相似文献，搜索用时 187 毫秒
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针对一类具有未知饱和模型的单输入单输出非线性系统的控制问题,根据滑模控制原理和多层神经网络的逼近能力,提出了一种直接自适应神经网络控制器的设计新方案。该方法将控制增益推广到未知函数,通过补偿饱和模型方法取消了饱和模型各参数已知的条件。鲁棒项的引入消除了建模误差和参数估计误差的影响。理论分析证明了闭环系统是半全局一致终结有界,跟踪误差收敛到零的邻域内。仿真结果进一步表明所提控制方法的有效性。 相似文献
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针对具有死区非线性输入的未知混沌系统的控制问题,基于Lyapunov稳定性理论建立变结构模糊自适应控制器及系统参数的自适应规则。控制器的设计过程中无需知道未知非线性未知函数的上界及非线性控制输入的增益衰减度,该方法能有效消除死区非线性输入对系统的影响,并能保证闭环系统所有信号一致有界,跟踪误差渐近收敛到原点的一个可调邻域内。数值仿真的结果也验证了该方法的有效性。 相似文献
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集中供热系统热网有着多输入、多输出、非线性、时变性、强耦合的特点,智能解耦控制算法是解决热网流量控制的有效方法。文章讨论了神经网络解耦控制策略,设计了基于非线性、多变量的神经网络解耦控制器。应用于实验室热网控制的结果表明,该控制算法有明显的控制效果,能实现稳定供热和均匀供热的整体目标。 相似文献
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研究一类具有输入饱和的非线性广义时滞系统的H∞控制问题.使用线性矩阵不等式方法和Lyapunov稳定性理论给出该系统具有H∞范数约束γ的充分条件,并给出一种H∞控制器的设计方法.运用一个数值算例来说明本文方法的有效性. 相似文献
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《实验室研究与探索》2019,(10)
针对风力发电系统的非线性和时变性,常规PID控制已经很难满足风电控制系统的需要。提出一种基于非线性扩张状态观测器-PID(Nonlinear extended state observer PID,NESO-PID)的双闭环变桨控制策略。该策略考虑到风力发电系统的外部干扰和内部扰动,输入端把转速偏差和功率偏差通过PID控制器进行控制,变桨部分设计一个状态观测器对系统桨距角和风轮转速干扰信号进行测量,把测量结果作为新的状态变量输入观测器,并将观测器的观测信号反馈到输入端实时补偿。通过Matlab/Simulink仿真验证,非线性扩张状态观测器PID变桨控制比常规PID变桨控制具有更好的动态特性和鲁棒性。通过仿真实验,可以使学生观察系统的状态变化过程,加深对知识的理解,能够有效提高教学效果。 相似文献
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《荆门职业技术学院学报》2015,(6):77-81
研究了一类含有死区非线性输入的蔡氏混沌系统的投影同步控制。基于李雅普诺夫稳定性理论和未知非线性项的估计,给出了一个新颖的变结构控制器,保证驱动-响应系统所有状态轨迹同步。最后,利用Matlab软件进行数值模拟,验证了该控制方法的有效性。 相似文献
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研究一类非线性广义系统的H∞控制问题.基于Hamilton-Jacobi不等式,给出一类非线性广义系统满足H∞控制性能要求的一个充分条件,即使系统在平衡点局部渐近稳定,是指数1的,且从外部输入到控制输出的L2增益小于或等于预先设定的正数.进而,给出状态反馈H∞控制器的一种设计方法. 相似文献
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由于pH过程的非线性和滞后性,pH值的检测和控制在化工生产过程中并非易事。非线性控制器可以对pH过程进行十分有效的控制。本文主要分析了pH值曲线的非线性特点,介绍了近年来应用于pH过程控制的非线性控制理论和方法,如模糊控制和反馈线性化控制等,并进行比较和讨论。 相似文献
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An adaptive backstepping sliding mode control is proposed for a class of uncertain nonlinear systems with input saturation.A command filtered approach is used to prevent input saturation from destroying the adaptive capabilities of neural networks (NNs).The control law and adaptive updating laws of NNs are derived in the sense of Lyapunov function,so the stability can be guaranteed even under the input saturation.The proposed control law is robust against the disturbance,and it can also eliminate the impact of input saturation.Simulation results indicate that the proposed controller has a good performance. 相似文献
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针对受限环境下四旋翼无人飞行器在参数不确定及外部扰动影响下的高性能高度控制问题,设计一种基于复合非线性反馈（CNF）和自适应非光滑轨迹跟踪控制的高度控制方法。通过四旋翼无人飞行器的垂直通道动力学模型分析和变换,将高度轨迹规划问题转换为输入受限的线性系统控制问题,设计CNF控制器实现轨迹生成;建立参数不确定及外部扰动影响下的垂直通道动力学模型,设计一种自适应非光滑轨迹跟踪控制器,并理论证明了闭环系统稳定性。最后,通过仿真实验验证所提出方法的有效性。结果表明,所设计方法能够有效提高参数不确定及外部扰动下的高度控制品质,且简单实用。 相似文献
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A continuous-time nonlinear model predictive controller （NMPC） was designed for a boiler-turbine unit. The controller was designed by optimizing a receding-horizon performance index, with the nonlinear system approximated by its Taylor series expansion with a certain order, the magnitude saturation constraints on the inputs satisfied by increasing the predictive time, and the rate saturation conditions on the actuators satisfied by tuning the time constant of the reference trajectories in a reference governor. Simulation results showed that the controller can drive the drum pressure and output power of the nonlinear boiler-turbine unit to follow their respective reference trajectories throughout a varying operation range and keep the water level deviation within tolerances. Comparison of the NMPC scheme with the generic model control （GMC） scheme indicated that the responses are slower and there are more oscillations in the responses of the water level, fuel flow input and feed water flow input in the GMC scheme when the boiler-turbine unit is operating over a wide range. 相似文献
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A generalized controller based on stability theory of singularly perturbed systems is proposed, to deal with the problem of bounded actuator inputs in robot trajectory tracking control. The saturation function with error-gain matrix is applied in the torque control law, which ensures the upper bound of torque inputs in any given limited range. Through appropriately setting the entries of the error-gain matrix, the tracking performance can be improved. Moreover, a pseudo signal is generated from a linear filter to substitute for the actual velocity error, eliminating the need for velocity measurements. Finally, to verify the effectiveness of the generalized controller, a new saturated controller with error-gain-contained arc tangent function is designed. Comparison experiments show that the proposed controller can strictly guarantee the bound of the torque inputs in situations with non-zero initial tracking errors, and gives a better tracking result than other controllers. 相似文献
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本文提出了一种基于混沌变量的模糊控制器设计方法,结合融合技术用以解决模糊控制器的规则爆炸问题。针对二次型最优控制中加权矩阵较难确定的问题,引入混沌大范围粗搜索和局部细搜索相结合,进而搜索出全局最优的权系数,用以提高控制的性能。通过二级倒立摆实物控制实验结果说明该方法是有效可行的。 相似文献
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针对AC伺服电机系统,在转矩及转动惯量变化情况下,对比反推自适应控制和滑膜控制两种方法在系统参数变化和阻力扰动的鲁棒性。仿真情况包括理想模型、摩擦力扰动、执行器饱和等。仿真结果表明反推自适应控制对系统变化具有很强鲁棒性,但是更容易受到执行器饱和影响;滑模控制方法更容易实现,但是在摩擦扰动存在情况下,振动式冲击难以消除。 相似文献
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Robust adaptive controller design for a class of nonlinear systems with unknown high frequency gains
INTRODUCTIONMany researchers have devoted their energy to the development of nonlinear system with unknown control directions during the past few years. The class of nonlinear system has been developed greatly since Mudgett and Morse (1985) relaxed the assumption that the unknown multiplicative terms are not only sign-invariant but also have known signs. A method called correction vector approach was proposed in (Lozano et al., 1990) and has been applied to design adaptive controller of … 相似文献
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通过介绍一种模糊控制器的设计方法,给出了模糊控制器设计的算法流程图及输入量量化程序、模糊控制表查询程序等关键步骤,以此方法设计的模糊控制器由输入量模糊化接口、规则库、推理算法和输出去模糊接口四个部分组成,其结构简单、使用方便,具有广阔的应用前景。 相似文献
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To prevent the oxygen starvation and improve the system output performance, an adaptive inverse control (AIC) strategy is developed to regulate the air supply flow of a proton exchange membrane fuel cell (PEMFC) system in this paper.The PEMFC stack and the air supply system including a compressor and a supply manifold are modeled for the purpose of performance analysis and controller design. A recurrent fuzzy neural network (RFNN) is utilized to identify the inverse model of the controlled system and generates a suitable control input during the abrupt step change of external disturbances. Compared with the PI controller, numerical simulations are performed to validate the effectiveness and advantages of the proposed AIC strategy. 相似文献