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H_∞ fault estimation for a class of linear time-delay systems in finite frequency domain
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作者 Quanchao Dong Maiying Zhong Steven X. Ding 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2010年第5期835-841,共7页
This paper deals with the problem of H∞ fault estimation for linear time-delay systems in finite frequency domain.First a generalized coordinate change is applied to the original system such that in the new coordinat... This paper deals with the problem of H∞ fault estimation for linear time-delay systems in finite frequency domain.First a generalized coordinate change is applied to the original system such that in the new coordinates all the time-delay terms are injected by the system's input and output.Then an observer-based H∞ fault estimator with input and output injections is proposed for fault estimation with known frequency range.With the aid of Generalized Kalman-Yakubovich-Popov lemma,sufficient conditions on the existence of the H∞ fault estimator are derived and a solution to the observer gain matrices is obtained by solving a set of linear matrix inequalities.Finally,a numerical example is given to illustrate the effectiveness of the proposed method. 展开更多
关键词 fault estimation TIME-DELAY generalized coordinate change generalized Kalman-Yakubovich-Popov lemma finite frequency domain.
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The output feedback control for uncertain nonholonomic systems
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作者 Qiangde WANG Chunling WEI Siying ZHANG 《控制理论与应用(英文版)》 EI 2006年第2期128-132,共5页
This paper considers the problems of almost asymptotic stabilization and global asymptotic regulation (GAR) by output feedback for a class of uncertain nonholonomic systems. By combining the nonsmooth change of coor... This paper considers the problems of almost asymptotic stabilization and global asymptotic regulation (GAR) by output feedback for a class of uncertain nonholonomic systems. By combining the nonsmooth change of coordinates and output feedback domination design together, we construct a simple linear time-varying output feedback controller, which can universally stabilize a whole family of uncertain nonholonomic systems. The simulation demonstrates the effectiveness of the proposed controller. 展开更多
关键词 Uncertain nonholonomic systems Output feedback Nonsmooth change of coordinates
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Constant-gain nonlinear adaptive observers revisited: an application to chemostat systems
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作者 Jorge A.TORRES Arno SONCK +1 位作者 Sergej CELIKOVSKY Alma R.DOMINGUEZ 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2021年第1期68-78,共11页
This study deals with constant-gain adaptive observers for nonlinear systems,for which relatively few solutions are available for some particular cases.We introduce an asymptotic observer of constant gain for nonlinea... This study deals with constant-gain adaptive observers for nonlinear systems,for which relatively few solutions are available for some particular cases.We introduce an asymptotic observer of constant gain for nonlinear systems that have linear input.This allows the observer design to be formulated within the linear matrix inequality paradigm provided that a strictly positive real condition bet ween the inpu t disturbance and the output is fulfilled.The proposed observer is t hen applied to a large class of nonlinear chemos tat dynamical systems that are widely used in the fermentation process,cell cultures,medicine,etc.In fact,under standard practical assumptions,the necessary change of the chemos tat state coordinates exis ts,allowing use of the const ant-gain observer.Finally,the developed theory is illustrated by estimating pollutant concentration in a Spirulina maxima wastewater treatment facility. 展开更多
关键词 Nonlinear observers Adaptive observers coordinate change Chemos tat Pollu taut observation
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