具有最小特征值灵敏度的输入-输出反馈补偿器的设计

本文讨论了具有最小特征值灵敏度的输入-输出反馈补偿器的设计方法.它是通过通常 设计的输入-输出反馈补偿器所具有的某些自由度来实现的.     

扰动下线性二次型反馈调节器的鲁棒性与灵敏度

本文考虑定常线性系统的两类扰动,利用二次型反馈词节器分别得到其鲁棒性与灵敏度的结果。     

混合灵敏度问题的鲁棒H-/LTR设计方法

本文对具有输出乘型不确定性的Ｈ∞混合灵敏度问题进行了研究，提出了一种新的鲁棒Ｈ∞／ＬＴＲ设计方法。这种设计方法由三部分组成：首先针对偶系统设计一个Ｈ∞全状态反馈控制，使得系统满足性能和鲁棒性要求。其次设计一个全状态观测器，使得上述状态反馈的特性得以恢复，最后综合出满足原系统性能和鲁棒性要求的输出反馈动态控制律。     

多组分精馏塔灵敏度系数和灵敏度的计算

通过正确划分精馏过程的状态变量及决策变量,从精馏塔的过程方程入手,建立了多组分精馏塔灵敏度分析的数学模型及计算方法。通过该方法可方便地求出精馏塔名状态变量对决策变量的灵敏度及灵敏度系数,定量地确定设计裕量,从而为精馏塔控制方案的设计及实际生产操作提供依据。     

一种状态反馈的最佳控制设计法

针对状态反馈控制设计法存在的问题,论文提出一种以时间加权的误差积分(ITE)为最优准则,并采用遗传算法寻找最佳状态反馈增益与参考输入增益,以获得系统最佳动态性能并克服了静差,这为状态反馈控制设计提供了一种新思路。仿真实验证明,文中提出的方法是有效的。     

基于灵敏度理论的μ/QFT鲁棒飞行控制器设计

针对具有大的不确定性和非线性特性的对象,研究了一种综合μ方法和定量反馈理论(QFT)的鲁棒控制器的设计方法,使闭环系统具有良好的鲁棒性;该方法在利用μ理论设计初始控制器的基础上,采用QFT方法进行优化整形;其中,为便于μ方法权函数的选择和QFT边界曲线的计算,引进鲁棒控制中的灵敏度设计方法进行分析;最后,通过对一个实例的仿真分析验证了该方法的有效性和可行性。     

一种基于灵敏度的自整定最优PI控制器

1　引言在工业过程控制中 ,PID控制器是最为常用的控制算法[1 ] .这种控制器被广泛应用主要是因为它结构简单、在实际中容易被理解和实现 ,而且许多高级控制都是以它为基础的 .PID参数的整定一般需要经验丰富的工程技术人员来完成 ,既耗时又耗力 ,加之实际系统千差万别 ,又有滞后、非线性等因素 ,使 PI参数的整定有一定的难度 ,致使许多 PID控制器没能整定得很好 ,这样的系统自然无法工作在令人满意的状态 ,为此人们提出了自整定控制器 .本文给出一种实用的基于灵敏度的自整定最优 PI控制器 ,该控制器适用于广泛的自衡系统 .这种 PI自…     

基于状态观测器的H-状态反馈控制

本文提出一种基于状态观测器的H_∞曲状态反馈控制,把输出反馈的H_∞控制问题转换成使用状态观测器的H_∞控制问题.通过直接求解状态空间方程,可以获得使用状态观测器的H_∞控制器及其存在的充要条件,它依赖于两个Rjccati方程的解,而且对控制对象的约束不需要满足所谓的正交条件,状态观测器的阶数与控制对象相同,它的输出是控制对象在最坏扰动作用下的状态估计值。     

基于反馈线性化的液压型风力发电机组最佳功率追踪控制

液压型风力发电机组在额定风速以下时为获得最多电能,需随风速变化追踪最佳功率点.建立并网液压型风力发电机组仿射非线性数学模型,基于反馈线性化方法,分别以风力机转速和液压系统传输功率为输出,以变量马达摆角为控制输入,线性化系统,设计最佳转速与最佳功率追踪控制器,实现机组在额定风速以下随风速变化输出最佳功率.仿真结果表明,以液压系统传输功率为控制输出的功率追踪过程动静态特性较好.理论分析表明,控制器中高压腔压力变化率是否可以规划,是影响功率追踪过程稳定性的关键因素.     

改进的Butterworth最佳传递函数标准型

针对Buttervvorth最佳传递函数随着阶数增大,超调量增大,单位阶跃响应品质变差的问题,本文提出一种改进的Buttervvorth最佳传递函数来提高系统的瞬态响应品质,并给出改进的Buttervvonh最佳传递函数的标准型以及它们的单位阶跃响应。     

The Changing Face of Continuity Planning

Abstract

Heraclitus once said, “There is nothing permanent except change.” Along this line it is interesting to note that the continuity planning profession continues to evolve from the time when disaster recovery planning (DRP) for mainframe data centers was the primary objective. In looking back, some of us who have been around awhile may reminisce about the good ol' days when identification of critical applications was the order of the day. These applications could be easily plucked from a production environment to be plopped down in a hot site somewhere, all in the name of preventing denial to information assets. In retrospect, things were so simple then — applications stood alone, hardwired coax connectivity was limited and limiting, centralized change control ruled, physical security for automated spaces solved a multitude of sins, less than half a dozen vendors were out there to provide assistance, etc. Ah, those were the days!     

On the Continuity of Granulometry

One of the most fundamental operators of mathematical morphology, the granulometry operator Ψ _t assigning to a compact set (or to a grayscale function) its granulometric opening by a convex set, is generally considered to be upper semicontinuous but not continuous. We consider this a deficiency and intend to rectify it, mainly by an adjustment of convergence assumptions.     

Continuity of dynamical systems: The continuous-time case

The purpose of this paper is to study continuity of the parametrization of continuous-time linear time-invariant differential systems having a finite-dimensional state space. We show that convergence of the behavior of such systems corresponds to convergence of the coefficients of a set of associated differential equations. For this to hold, both the behavior and the convergence need to be appropriately defined.     

曲面二阶几何连续性的混合曲率评价与可视化

曲面连续性评价与可视化在工业设计和分析过程中起着重要作用.针对曲面二阶几何连续性评价,提出了混合曲率的概念,并给出了基于混合曲率的曲面二阶几何连续性评价与可视化方法,可处理比传统基于单一曲率的评价方法更多奇异情况;还给出了纹理映射方法和自适应网格细分的实现算法,达到实时渲染和精度可调的要求.最后通过实例说明了该方法的有...     

Continuity in cognition

Designing for continuous interaction requires designers to consider the way in which human users can perceive and evaluate an artefact’s observable behaviour, in order to make inferences about its state, and plan and execute their own continuous behaviour. Understanding the human point of view in continuous interaction requires an understanding of human causal reasoning, of the way in which humans perceive and structure the world, and of human cognition. We present a framework for representing human cognition, and show briefly how it relates to the analysis of structure in continuous interaction, and the ways in which it may be applied in design. Published online: 14 May 2002     

Continuity versus Discretization

The threefold interest in architecture, biology and mathematics motivated us to examine and justify new architectural forms. We discuss some notions of rhythm: Euclidean, morphogenetic and morphologic. Contemporary relationships between structure and form are based on the generation of shape by technological processes, thus the resulting objects are restricted to their material expression. Here a phenomenological organisation of form and its continuity with the landscape arise out of the mathematical and architectural creativity. The use of the computer is applied from outside to inside instead from inside to outside; this means that we are dealing with the organisational processes via continuous methods instead of evolutionary processes given by computer simulations, known as genetic algorithms, where the resulting configurations are reduced to a matter of routine. The role of design as an aesthetic component innovates the theoretical framework of structural engineering to establish the architectural environments.     

光学烟雾探测器灵敏度研究

传导型光学烟雾探测器的可靠性会受到光学元件寄生效应灵敏度的影响,特别是温度.剧烈温度变化的影响,不能通过滤波器消除.因为它的光谱和烟火吸收系数的光谱有重叠.本文得出了传导型光学烟雾探测器对温度的传递函数.利用光电子二极管系统的二阶热学模型,得出了光源和接收器二极管结点温度差的稳态解析式.基于对热系统的分析,得出了和RC低通滤波器模型等效的框图.在此框图的基础上,对如何消除环境温度变化和探测器响应的阈值灵敏度的影响进行了分析.     

Continuity of latent variable models

The authors study the continuity of the behavior of dynamical systems as a function of the parameters in their behavioral equations. A system is defined in terms of its behavior and continuity requires that this behavior be continuous in the limit. The problem is demonstrated by means of an example involving an RLC circuit whose port behavior exhibits a surprising discontinuity as a function of the numerical values of the elements in the circuit. The main result states that a system described by means of difference equations involving manifest (external) and latent (internal) variables will have a continuous behavior in the limit if the limit system is observable