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一类模糊非线性系统自适应输出反馈控制 总被引:2,自引:0,他引:2
针对一类未知非线性系统,利用模糊逻辑系统、H∞控制和高增益观测器,提出了
一种模糊自适应输出反馈控制方法.证明了所设计的输出反馈控制器可以获得状态反馈控制
器的性能.仿真结果证明了所提出方法是有效的. 相似文献
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研究不确定系统D-稳定鲁棒容错H∞控制问题.基于连续型执行器故障模式,利用线性矩阵不等式(LMI)给出了系统D-稳定的鲁棒容错输出反馈控制器存在的充分条件,并将动态输出反馈控制器设计方法归结为求解一族线性矩阵不等式组.仿真示例表明,无论执行器是否发生故障,所得到的动态输出反馈控制器不仅保证闭环系统是D-稳定的,而且满足给定的H∞干扰指标,从而验证了所提出的控制器设计方法的有效性. 相似文献
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本文给出了混合H2/H∞控制的完整信息、完整控制、干扰顺馈、输出估计这四种典型情况的描述,在二次稳定意义上的混合H2/H∞性能指标下,讨论了这四种典型情况的混合H2/H∞线性反馈控制器设计,给出了充分必要条件。这四种典型情况的最优混合H2/H∞线性反馈控制器设计,归结为解一个带有参数的Rccati方程,且仅解一个Riccati方程。该Riccati方程随参数变化,饮食了单纯的H2和H∞设计,可看作是H2、H∞和混合H2/H∞的统一表达式。最后通过一个简单的例子,说明了本文的方法。 相似文献
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为避免间接法设计降阶控制器的模型近似引起的性能下降,本文在静态输出反馈控制器设计的基础上,直接设计了线性不确定系统的给定阶混合H2/H∞动态反馈控制器.利用系统内外分解方法,得到了最优降阶状态观测器.通过求解降维状态观测器的静态输出反馈,可得到降阶控制的最优反馈增益阵.给定阶控制器由两个Ric cati方程和一个Lyapunov方程参数化表示.最后,通过一个例子,说明了本文提出的给定阶控制器设计方法. 相似文献
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在状态空间描述下,定义了混合H2/H∞控制的完整信息、完整控制、干扰顺馈、输出估计这4种典型情况.在二次稳定意义上,讨论了混合H2/H∞的性能指标,及这4种典型情况的混合H2/H∞线性反馈控制器设计,给出了充分必要条件.在典型情况分析的基础上,研究一般意义上的混合H2/H∞反馈控制器设计.H2和H∞的干扰输入阵及性能评价函数各不相同时的混合H2/H∞反馈控制器,与H2和H∞控制器设计相似,归结为解两个Riccati方程.但这两个Riccati方程含有参数,最优解要通过搜索这两个参数得到.结果包含了单纯的H2和H∞设计,可看作是H2,H∞和混合H2/H∞的统一设计方法.最后通过一个简单的例子,说明了控制器设计方法的可行性. 相似文献
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提出一种自适应模糊滑模控制方法用以提高可控励磁直线同步电动机(controllable excitation linear synchronous motor,CELSM)磁悬浮控制系统的性能.根据CELSM的特定结构和运行机理,建立CELSM磁悬浮系统的数学模型,包括励磁回路的电压方程、磁悬浮力方程和运动方程;设计积... 相似文献
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本文考虑带有常数干扰的抽象正则线性系统的状态反馈镇定问题.本文控制设计采用线性系统的动态补偿方法,将传统的PID控制推广到无穷维正则线性系统.通过引入积分作用,控制器可以有效地补偿常数干扰.论文给出了具体的状态反馈法则,并证明了对应闭环系统的指数稳定性.理论结果被应用于带有常数干扰的不稳定热方程,给出了控制器及其闭环系统的指数稳定性,数值仿真验证了本文理论结果的有效性. 相似文献
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H. M. Guzey 《控制论与系统》2017,48(2):71-83
Hybrid consensus-based formation control is designed in this paper for a team of fixed-wing unmanned aerial vehicles (UAVs). The UAVs moving at fixed altitudes are controlled through a novel hybrid controller to drive them to a goal location while maintaining a predefined formation. The hybrid automaton has two discrete modes, each with continuous dynamics: a regulation mode and a formation keeping mode. The controller in the regulation mode uses local UAV state information to achieve its desired location, while the formation controller utilizes the neighbor UAVs’ state and controller information. The theoretical conjecture is verified by simulation results. 相似文献
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发电机的频率响应特性是电力系统稳定器的参数整定的重要依据,为优化参数整定,维护电力系统安全稳定运行,对引入调差单元的发电机的频率响应特性进行研究.通过分析负载电流极性、调差系数及调差极性改变时励磁系统测量电压的变化特性,采用戴维南电路对自动励磁的作用进行等效研究,并对不同调差方式下发电机的频率响应特性进行了仿真实验.理论分析与仿真结果表明,调差单元引入后测量电压的改变会影响同一频率下发电机机端电压的幅值和相位,且调差单元在低频段对发电机频率响应特性的影响较为明显,因此具有一定的工程应用价值. 相似文献
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磁轴承变饱和柔性变结构控制 总被引:1,自引:0,他引:1
采用磁轴承取代传统机械轴承,可消除飞轮储能装置机械摩擦,提高转子临界转速.针对磁轴承控制系统响应快、运行稳定的要求,设计了一种变饱和柔性变结构控制器.根据磁轴承的基本结构与悬浮力模型,建立了系统的状态方程;通过有限元仿真,分析了磁轴承耦合性,确定了系统基本控制方案;将柔性变结构和变饱和项结合,当系统存在较大偏差时只通过线性控制器调节,在中等偏差时通过线性控制器和变饱和状态控制器一起调节,在小偏差时由线性控制器和变饱和状态控制器转变的线性控制器一起调节.仿真与实验结果表明,变饱和柔性变结构控制满足实时控制的要求,磁轴承控制系统具有较快的响应速度和较高的运行稳定性. 相似文献
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This paper investigates a new state feedback controller design for DC/DC three-cell converter. The high dynamic performances of the converter have been translated into a desired limit cycle stabilization problem. The state feedback is established using hybrid automaton formalism, which allows us to design independently a transitory state and steady state control schemes. Finite-time convergence of the trajectory to the steady state and the local asymptotic stability of the desired limit cycle under the proposed controller are proved analytically. Simulation and experimental results confirm the theoretical results and show the effectiveness and robustness of the hybrid controller in spite of load variations. 相似文献
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The iterative method labelled correlation-based tuning (CbT) is considered in this paper for tuning linear time-invariant multivariable controllers. The approach allows one to tune some elements of the controller transfer function matrix to satisfy the desired closed-loop performance, while the other elements are tuned to mutually decouple the closed-loop outputs. Decoupling is achieved by decorrelating a given reference with the non-corresponding outputs. The controller parameters are calculated either by solving a correlation equation (decorrelation procedure) or by minimizing a cross-correlation function (correlation reduction). In addition, the preferred way of exciting a 2×2 system for CbT is investigated via the accuracy of the estimated controller parameters. It is shown that simultaneous excitation of both reference signals does not improve the accuracy of the estimated controller parameters compared to the case of sequential excitation. In fact, one must choose between low experimental cost (simultaneous excitation) and better accuracy of the estimated parameters (sequential excitation). The theoretical results are illustrated via three simulation studies. 相似文献
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Tzyy-Sheng Horng Nicolaos G. Alexopoulos Shih-Chang Wu Hung-Yu Yang 《国际射频与微波计算机辅助工程杂志》1992,2(4):224-240
This article is a survey of the theoretical background for full-wave spectral-domain analysis of open microstrip discontinuities of arbitrary shape. The spectral-domain dyadic Green's function, which takes into account all the physical effects, such as radiation and surface waves, is used to formulate an electric field integral equation. The method of moments is then employed to find the current distribution on the microstrips, and subsequently, the scattering parameters of the junctions. Since all field components can be expressed in terms of the dyadic Green's function and the current distribution, the losses due to both radiation and surface waves are further determined through a rigorous Poynting vector analysis. To model the discontinuities of arbitrary shape, both rectangular and triangular subdomain functions are used as the current expansion functions in the moment method procedure. In addition, the semi-infinite traveling wave functions are applied to simulate the feeding structure and isolate individual junction effects. Several examples are demonstrated to illustrate the utility of different techniques in this analysis. Comparison of some numerical results with available experimental data shows excellent agreement. Finally, this approach is most natural for the characterization of 3-D integrated circuits and the design of printed antennas including excitation circuit effects. © 1992 John Wiley & Sons, Inc. 相似文献
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本文研究了色噪声激励下具有时滞反馈控制的双稳态压电-电磁混合式俘能器的动力学特性.首先,建立了非线性双稳态压电-电磁俘能器的集中参数型机电耦合运动方程,并基于能量包线随机平均法推导得到系统稳态概率密度函数和平均输出功率表达式,通过蒙特卡洛数值方法验证了理论解的正确性.其次,分析了时滞和反馈增益系数对系统输出功率的影响.研究结果表明:在一定参数范围内,随着位移时滞与速度时滞的增加,输出功率出现周期性变化,并在特定的时滞与反馈增益组合下达到最大值;调节反馈增益系数可以改变输出功率的相位和大小.说明通过合理地设置时滞反馈控制可以提高俘能器的采集功率,为随机激励下非线性振动俘能器的设计和优化提供一定的理论依据. 相似文献