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21.
A survey on industrial applications of fuzzy control 总被引:4,自引:0,他引:4
Fuzzy control has long been applied to industry with several important theoretical results and successful results. Originally introduced as model-free control design approach, model-based fuzzy control has gained widespread significance in the past decade. This paper presents a survey on recent developments of analysis and design of fuzzy control systems focused on industrial applications reported after 2000. 相似文献
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This paper discusses issues related to the approximation capability of neural networks in modeling and control. We show that neural networks are universal models and universal controllers for a class of nonlinear dynamic systems. That is, for a given dynamic system, there exists a neural network which can model the system to any degree of accuracy over time. Moreover, if the system to be controlled is stabilized by a continuous controller, then there exists a neural network which can approximate the controller such that the system controlled by the neural network is also stabilized with a given bound of output error. 相似文献
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Based on the genetic algorithm (GA), an approach is proposed for simultaneous design of membership functions and fuzzy control rules since these two components are interdependent in designing a fuzzy logic controller (FLC). With triangular membership functions, the left and right widths of these functions, the locations of their peaks, and the fuzzy control rules corresponding to every possible combination of input linguistic variables are chosen as parameters to be optimized. By using a proportional scaling method, these parameters are then transformed into real-coded chromosomes, over which the offspring are generated by rank-based reproduction, convex crossover, and nonuniform mutation. Meanwhile, the concept of enlarged sampling space is used to expedite the convergence of the evolutionary process. To show the feasibility and validity of the proposed method, a cart-centering example will be given. The simulation results will show that the designed FLC can drive the cart system from any given initial state to the desired final state even when the cart mass varies within a wide range. 相似文献
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提出2种通过储能装置实现的电力系统控制器,用以减小在系统中以波的形式传播的机电扰动(发电机角速度偏移量或输电线路上功率变化量)的幅值.分析控制器在机电波传播路径上的安装位置,一种控制器安装在发电机母线上,输出有功功率随安装处发电机角速度的变化而变化;另一种控制器安装在负荷母线上,输出有功功率随安装处负荷母线电压频率的变化而变化.理论计算结果和WECC127母线的仿真结果均表明该控制器能有效降低机电波的幅值. 相似文献
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针对因素相关的威胁估计问题,提出了基于Choquet模糊积分的威胁估计方法。该方法通过gλ模糊测度对威胁因素和因素集的重要程度进行建模,利用因素的Shapley值,根据Marichal熵求解gλ模糊测度,并通过Choquet模糊积分实现目标威胁程度的估计。最后,以空战目标威胁估计问题为例,验证了方法的有效性。 相似文献
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In this article, we propose a general controller structure for asymptotic position regulation of electromechanical systems derived using the Interconnection and Damping Assignment Passivity‐Based Control methodology recently proposed in the literature. The controller is applicable to arbitrary fully actuated electromechanical systems with linear magnetic materials consisting of inductances, permanent magnets, and one mechanical co‐ordinate. We assume linear magnetic materials and fully actuated electrical dynamics; however, no restrictions are imposed on the particular form of the parameters that define the system dynamics, i.e. the inductance matrix, the magnetic coupling or the potential energy function. This allows us to treat—in a unified framework and without any additional simplifying assumptions—very diverse applications, including magnetic suspensions, and stepper and permanent magnet synchronous motors. Instrumental for our developments is the inclusion of ‘virtual’ couplings between the electrical and the mechanical subsystem, which is naturally suggested in this control methodology. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
30.
Andrey V. Savkin 《Systems & Control Letters》1998,33(5):281-289
This paper considers the problem of simultaneous H∞ control of a finite collection of linear time-invariant systems via a nonlinear digital output feedback controller. The main result is given in terms of the existence of suitable solutions to Riccati algebraic equations and a dynamic programming equation. Our main result shows that if the simultaneous H∞ control problem for k linear time-invariant plants of orders n1,n2,…,nk can be solved, then this problem can be solved via a nonlinear time-invariant controller of order nn1+n2++nk. 相似文献