共查询到18条相似文献，搜索用时 78 毫秒
1.
2.
基于Matlab语言定量反馈控制器的分析与设计 总被引：4，自引：2，他引：4
对定量反馈理论（QFT）的基本原理进行了介绍和利用Matlab语言工具箱进行设计的基本方法，Matlab通用QFT工具箱为用户进行QFT控制器的设计提供了有利的工具，文章就以典型二阶系统为例进行QFT控制器的设计，仿真的结果表明定量反馈理论在不确定系统设计中有着经典控制理论无法替代的性能。 相似文献
3.
本文讨论了输出反馈配置线性多变量定常系统鲁棒极点的问题,提出了一种设计方法和有关定理,并用实例说明了该法的应用。 相似文献
4.
5.
定量反馈理论(quantitative feedback theory,QFT)作为一种频率域鲁棒控制技术,综合考虑了对象的不确定性范围和对系统的性能指标要求,以定量方式在Nichols图上展开分析与设计,从而保证了设计结果具有稳定鲁棒性;而当某处喷管失效时,作用在飞行器上的控制力矩所受的影响可看作是不确定对象鲁棒性问题的扩展,因此,考虑喷管故障时的重构飞行控制也可用QFT方法进行分析与设计;在讨论QFT原理与应用的基础上,以某飞行器的飞行控制设计为例,对鲁棒和重构飞行控制进行了分析、研究与设计,获得了满意的设计结果。 相似文献
6.
冯蕾 《数字社区&智能家居》2007,2(6):1330-1332
本文对H∞控制理论近二十年来的发展状况进行了综述。首先概括性的介绍了H∞控制理论的发展背景、诞生、发展和成熟。进而，针对近几年我国控制的发展详述了其主要的研究和应用成果。最后，总结了目前H∞控制存在的若干关键问题，并对今后H∞控制的发展进行了展望。 相似文献
7.
由于模型有确定性因素在存在，病态系统难以控制，本文应用定量反馈理论（QFT）方法对此进行研究，并结合算例讨论了有关界函数的选择问题。 相似文献
8.
针对长１ｍ直径为１０ｃｍ的管形实验装置进行主动噪声控制的试验研究,探索了利用ＱＦＴ技术为该装置设计固定参数控制器的可行性。控制器采用前馈加反馈的混合结构。文中给出了设计过程和结果分析,并介绍了一种声阻的获取方法。 相似文献
9.
鲁棒输出反馈控制器设计 总被引：1，自引：0，他引：1
研究了满足匹配条件的 不 确定线性系统鲁棒输出反馈控制器的设计问题，。首先推导了受约束Ｌｙａｐｕｎｏｖ问题的两个构造性结论，基于此，给出输出反馈控制器的设计。最后的算例表明了该方法的有效性。 相似文献
10.
为了使气动调节阀控制系统满足工业过程对于模型不确定性的鲁棒性要求,设计了1种基于定量反馈理论(QFT)的气动调节阀控制系统。基于QFT的控制器是1种二自由度控制器结构,由前置滤波器和反馈控制器组成。QFT对于控制对象的不确定性具有很强的鲁棒性,能够较好地避免气动调节阀控制系统在工业过程中受到的干扰和模型不确定性影响。通过对气动调节阀控制系统进行仿真分析,验证了基于QFT的控制方法能够较好地避免该系统的不确定性,使得该系统具有较强的鲁棒性,满足相应的性能指标要求。与传统基于常规比例积分微分(PID)控制方法的气动调节阀控制系统相比,基于QFT控制方法的气动调节阀控制系统更加适用于工业过程。 相似文献
11.
Simultaneous meeting of different‐nature feedback control specifications requires special attention, particularly in the presence of uncertainties. This paper introduces some ideas to obtain a feasible set of QFT bounds, analysing the compatibility of the desired control specifications and the model uncertainty. It studies general robust feedback requirements and their mapping on QFT bounds through quadratic inequalities. Analysing them, it is possible to infer the bound typology with dependence on the model of each particular specification and the uncertainty size. Two bound typologies (amongst three categories: upper, outer and lower bounds) are possible for each type of control objective. On this basis, some general hints are established to guarantee compatible bounds at each frequency, before designing the controller. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
12.
13.
Juan José Martín‐Romero Montserrat Gil‐Martínez Mario García‐Sanz 《国际强度与非线性控制杂志
》2009,19(17):1959-1971
》2009,19(17):1959-1971
This paper describes an analytical formulation to compute quantitative feedback theory (QFT) bounds in one‐degree‐of‐freedom feedback control problems. The new approach is based on envelope curves and shows that a QFT control specification can be expressed as a family of circumferences. Then, the controller bound is defined by the envelope curve of this family and can be obtained as an analytical function. This offers the possibility of studying the QFT bounds in an analytical way with several useful properties. Gridding methods are avoided, resulting in a lower computational effort procedure. The new formulation improves the accuracy of previous methods and allows the designer to calculate multivalued bounds. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
14.
An aircraft's response to control inputs varies widely throughout its full flight envelope. Furthermore, the aircraft configuration impacts control response through variations in centre of gravity and moments of inertia. Quantitative feedback theory (QFT) is a robust control system design method which provides a full-envelope flight control system design and gives the engineer direct control over compensator order and gain. A full subsonic flight envelope FCS is designed for using QFT for four representative aircraft configurations. Flying qualities are embedded in the longitudinal design by using a control variable which varies with the aircraft's energy state throughout the flight envelope. Linear simulations with realistically large control inputs are used to validate the design. © 1997 by John Wiley & Sons, Ltd. This paper was prepared under the auspices of the US Government and it is therefore not subject to copyright in the US. 相似文献
15.
16.
In this paper, a technique is presented for constructing the so‐called linear time‐invariant equivalent (LTIE) plants used in the nonlinear quantitative feed back theory (QFT) approach. The proposed technique is applicable equally well to both continuous‐time and sampled‐data nonlinear plants described by nonlinear integro‐differential equation and nonlinear autoregressive moving average with exogenous inputs (NARMAX) models, respectively. The technique uses inclusion function and interval integration tools of interval analysis. A nonlinear chemical reactor example is used to illustrate the procedure for both nonlinear continuous‐time and sampled‐data systems, and found to yield satisfactory results in both cases. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
17.
18.
Edward Boje 《国际强度与非线性控制杂志
》2002,12(4):303-320
》2002,12(4):303-320
This paper discusses multivariable quantitative feedback design through the use of controllers with off‐diagonal elements. Controller design for multivariable plants with significant uncertainty is simpler and potentially less conservative if some sort of dominance is achieved (by reducing the interaction effect of off‐diagonal plant elements) before a diagonal (decentralized) controller design is attempted. Traditional approaches for achieving dominance are not applicable when plant uncertainty must be considered. This paper discusses parallel and series implementations and for the latter, a pseudo‐Gauss elimination approach to the design has been developed. The interaction is measured using the Perron–Frobenius root of an interaction matrix. In some applications, it is possible to trade off individual plant cases against each other in order to reduce to the worst‐case interaction over the entire plant set. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献