不确定时滞广义系统的H∞弹性保性能控制

基于线性矩阵不等式（LMIs）方法,研究了一类不确定时滞广义系统的H∞弹性保性能控制器的设计问题。在假定控制器增益扰动范数有界的前提下,设计状态反馈控制器,使得闭环系统不仅对容许的参数不确定性保持正则,稳定,无脉冲,而且使得闭环系统性能指标具有上界的同时满足给定的H∞性能γ。以LMIs形式给出了状态反馈H∞弹性控制器的设计方法。最后,数值算例证明了该设计方法的有效性和可行性。     

DC/DC变换器自适应模糊逻辑控制器设计

文章为DC/DC变换器设计了一种自适应模糊逻辑控制器（AFLC）。所提出的AFLC不需要专家系统提供决策参数和控制规则,而是使用模型数据文件来产生参数和规则,该模型数据文件包含输入输出对的整体概况。所提出的控制器使用8位微控制器来实现降压、升压和降压-升压变换器。     

Guaranteed cost synchronization of a complex dynamical network via dynamic feedback control

In this paper, the problem of guaranteed cost synchronization for a complex network is investigated. In order to achieve the synchronization, two types of guaranteed cost dynamic feedback controller are designed. Based on Lyapunov stability theory, a linear matrix inequality (LMI) convex optimization problem is formulated to find the controller which guarantees the asymptotic stability and minimizes the upper bound of a given quadratic cost function. Finally, a numerical example is given to illustrate the proposed method.     

Modified adaptive controller for synchronization of incommensurate fractional-order chaotic systems

We investigate the synchronization of a class of incommensurate fractional-order chaotic systems,and propose a modified adaptive controller for fractional-order chaos synchronization based on the Lyapunov stability theory,the fractional order differential inequality,and the adaptive strategy.This synchronization approach is simple,universal,and theoretically rigorous.It enables the synchronization of0 fractional-order chaotic systems to be achieved in a systematic way.The simulation results for the fractional-order Qi chaotic system and the four-wing hyperchaotic system are provided to illustrate the effectiveness of the proposed scheme.     

Design of an adaptive finite-time controller for synchronization of two identical/different non-autonomous chaotic flywheel governor systems

The centrifugal flywheel governor(CFG) is a mechanical device that automatically controls the speed of an engine and avoids the damage caused by sudden change of load torque.It has been shown that this system exhibits very rich and complex dynamics such as chaos.This paper investigates the problem of robust finite-time synchronization of non-autonomous chaotic CFGs.The effects of unknown parameters,model uncertainties and external disturbances are fully taken into account.First,it is assumed that the parameters of both master and slave CFGs have the same value and a suitable adaptive finite-time controller is designed.Second,two CFGs are synchronized with the parameters of different values via a robust adaptive finite-time control approach.Finally,some numerical simulations are used to demonstrate the effectiveness and robustness of the proposed finite-time controllers.     

基于SDN架构的云网融合技术研究与实践

云网融合是一个新兴的概念,是信息技术和通信技术深度融合所带来的信息基础设施的深刻变革.本文研究将传统上相对独立的云计算资源和网络设施融合成一体化的技术架构,并结合实践案例提出,基于SDN架构进行网络改造和建设是实现云网融合的关键.运营商要不断探索云网统一的解决方案,最终构建端到端智能化管理的云网架构.     

具有函数的泛逼近性能的模糊控制器的设计

构造出9类具有函数的泛逼近性能的模糊控制器,这些模糊控制器均由模糊蕴涵算子构造而成.利用倒车仿真说明采用具有函数的泛逼近性能的模糊控制器可以用于实际的模糊控制系统中.     

神经网络PID控制及其Matlab仿真

讨论了基于神经网络的PID控制，并将其作用于工业控制，利用神经网络的自学习能力进行在线参数整定，并利用Matlab软件进行仿真。仿真结果表明，神经网络PID控制器具有较高的精度和较强的适应性，可以获得满意的控制效果。     

用于频率综合器的延迟锁相环的设计

设计了一种宽频率锁定范围、倍频数可编程的延迟锁相环。它引入了条件振荡控制电路,使该电路在保持DLL一阶系统和低抖动性能优势的基础上吸收了PLL倍频数可编程的优点;同时,该电路结合了设置延迟初始值和采用新型鉴相器两种宽频技术,具有宽频率工作范围。该延迟锁相环用SMIC 0.18μm 1.8 V CMOS工艺实现,锁定范围为1.56~100 MHz,可供选择的倍频数为1~16,输出频率范围从20 MHz到100 MHz。在输入最小频率、最大倍频数下,仿真的功耗约为9 mW,抖动约为92 ps。     

Stabilization using fractional-order PI and PID controllers

This paper presents a solution to the problem of stabilizing a given fractional dynamic system using fractional-order PIλ and PI^λD^μ controllers. It is based on plotting the global stability region in the (k _p, k _i)-plane for the PI^λ controller and in the (k _p , k _i , k _d)-space for the PIλDμ controller. Analytical expressions are derived for the purpose of describing the stability domain boundaries which are described by real root boundary, infinite root boundary and complex root boundary. Thus, the complete set of stabilizing parameters of the fractional-order controller is obtained. The algorithm has a simple and reliable result which is illustrated by several examples, and hence is practically useful in the analysis and design of fractional-order control systems.