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5Almost disturbance decoupling control of mimo nonlinear system subject to feedback linearization and a feedforward neural network: Application to half-car active suspension system

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INTERNATIONAL JOURNAL OF AUTOMOTIVE TECHNOLOGY 2010年第4期11卷 581-592页

作者： Li, T. H. S. Huang, C. J. Chen, C. C. Natl Chiyi Univ Dept Elect Engn Chiayi 60004 Taiwan Natl Cheng Kung Univ Dept Elect Engn Tainan 70101 Taiwan

A novel tracking and almost disturbance decoupling problem of multi-input, multi-output (MIMO) nonlinear systems based on feedback linearization and a multi-layered feedforward neural network approach has been proposed. The feedback linearization and neural network controller guarantees exponentially global uniform ultimate bounded stability and almost disturbance decoupling performance without using any learning or adaptive algorithms. The new approach renders the system to be stable with the almost disturbance decoupling property at each step when selecting weights to enhance the performance if the proposed sufficient conditions are maintained. One example, which cannot be solved by the existing approach of the almost disturbance decoupling problem because it requires the sufficient conditions that the nonlinearities that multiply the disturbances satisfy structural triangular conditions, is proposed to exploit the fact that the tracking and the almost disturbance decoupling performances are easily achieved by the proposed approach. In order to demonstrate the practical applicability, a famous half-car active suspension system is investigated.

关键词： Feedforward neural network multi-input multi-output system Almost disturbance decoupling Half-car active suspension system Feedback linearization approach

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Operator-based robust nonlinear control system design for MIMO nonlinear plants with unknown coupling effects

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INTERNATIONAL JOURNAL OF CONTROL 2010年第9期83卷 1939-1946页

作者： Deng, Mingcong Bi, Shuhui Okayama Univ Grad Sch Nat Sci & Technol Okayama 7008530 Japan

In this article, operator-based robust nonlinear control system design for multi-input multi-output (MIMO) plants with unknown coupling effects is considered. That is, by using operator-based robust nonlinear control design, coupling effects existing in the MIMO nonlinear plants can be decoupled based on a feedback design and robust right coprime factorisation approach, the coupling effects caused by controllers and plant outputs can be stabilised by using definition of Lipschitz operator and contraction mapping theorem, and output tracking performance can be realised by a tracking design scheme. Finally, a simulation example about temperature control process of 3-input/3-output aluminum plate is given to support the theoretical analysis.

关键词： multi-input multi-output system unknown coupling effects operator-based robust right coprime factorisation Lipschitz operator contraction mapping theorem

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A Revisit to the Stability of Spatially Interconnected systems

A Revisit to the Stability of Spatially Interconnected Syste...

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第二十九届中国控制会议

作者： ZHOU Tong Department of Automation and TNList,Tsinghua University,Beijing 100084,P.R.China

A necessary and sufficient condition is derived in this paper for the stability of a linear time invariant（LTI）multidimen-sional（MD）dynamic *** condition is expressed by a set of linear matrix inequalities（LMIs）.A special characteristic of this condition is that although the number of LMIs increases exponentially with the spatial dimension of the system,the dimensions of the LMIs are identical to each other and are of the same order as those of system ***,both the number and the dimensions of the LMIs are explicitly *** properties make the derived condition particularly attractive when the spatial dimensions are low that are frequently encountered in practical applications.

关键词： Linear Matrix Inequality multidimensional system multi-input multi-output system Stability Spatio-Temporal system

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Fault tolerant flight control system design using a multiple model adaptive controller

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING 2009年第G1期223卷 39-50页

作者： Jung, B. Kim, Y. Ha, C. Seoul Natl Univ Inst Adv Aerosp Technol Sch Mech & Aerosp Engn Seoul 151742 South Korea

This article presents a fault tolerant flight control system using multiple model adaptive control (MMAC). To apply this method to the aircraft, model reference adaptive control is extended to a linear discrete-time multiple-input multiple-output system. multiple models can be determined by various flight conditions with respect to possible aircraft fault situations. In this article, the damages of control effectors are considered as aircraft faults. The aerodynamic coefficients of fault model are derived by a damaged control surface area. In the MMAC, how to select a proper fault model and how to switch into the selected model are significant issues. The conventional mode switching method, however, has a tendency to make the system fluctuate because of frequent mode switching, and therefore may deteriorate the performance of the aircraft. In this study, the modified adaptive mode switching scheme and new decision logic are proposed to improve the adaptiveness in the transient state dynamics of system. Numerical simulations are performed for a linear discrete-time aircraft model to validate the effectiveness of the proposed method.

关键词： fault tolerant flight control multiple model adaptive control switching scheme decision logic multi-input multi-output system aircraft fault modelling

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SECURE DATA TRANSMISSION BASED ON multi-input multi-output DELAYED CHAOTIC system

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INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS 2008年第7期18卷 2063-2072页

作者： Zheng, G. Boutat, D. Floquet, T. Barbot, J. -P. Equipe Project ALIEN INRIA ENSEA 6 ECS F-95014 Cergy Pontoise France INRIA Rhone Alpes F-38334 Saint Ismier France Bourges Univ Orleans ENSI LVR F-18020 Bourges France Ecole Cent Lille CNRS LAGIS UMR 8146Project ALIEN INRIA Futurs F-59651 Villeneuve Dascq France

This paper deals with the problem of secure data transmission based on multi-input multi-output delayed chaotic systems. A new multi-input secure data transmission scheme is proposed. Moreover, in order to increase again the robustness of secure data transmission, delays are introduced as a second firewall against known plain-text attack. With this method, the parameters used as secret keys of the system are not identifiable and, as a result, the proposed scheme is robust to known plain-text attacks.

关键词： multi-input multi-output system chaos observer left invertibility problem delays system

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Further results on the boundedness of multidimensional systems

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systemS & CONTROL LETTERS 2009年第12期58卷 818-825页

作者： Zhou, Tong Tsinghua Univ Dept Automat & TNList Beijing 100084 Peoples R China

A sufficient condition is derived in this paper for the boundedness of a linear time invariant (LTI) multidimensional (MD) dynamic system over a special class of frequency domains. These frequency domains are able to include many practically adopted frequency domains, such as fans, rectangles, etc., as a special situation, as well as to give an approximation with a tolerable accuracy to many other physically significant frequency domains like ellipsoids and diamonds. This condition becomes also necessary when the prescribed frequency domain is path-connected. Moreover, it is expressed in a linear matrix inequality (LMI) form and can be directly applied to the optimization of system output matrix and direct transmission matrix, as well as the minimization of the frequency response bound. In addition, the dimension of the LMI is in the same order as that of the system matrices. (C) 2009 Elsevier B.V. All rights reserved.

关键词： Kalman-Yakubovich-Popov lemma Linear matrix inequality multidimensional system multi-input multi-output system Spectral masks Temporal-spatial system

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Vector sampling expansion in Riesz bases setting and its aliasing error

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APPLIED AND COMPUTATIONAL HARMONIC ANALYSIS 2008年第3期25卷 315-334页

作者： Kim, J. M. Kwon, K. H. Korea Adv Inst Sci & Technol Div Appl Math Taejon 305701 South Korea

We consider the multi-input multi-output (MIMO) system of vector valued band-limited signals, which are transferred through an M x N LTI (linear time invariant) system of channels. D. Seidner and M. Feder considered this vector sampling expansion (VSE) with the formal delta-method, which is a natural generalization of Papoulis' generalized sampling expansion (GSE) for single input multi-output systems. Later R. Venkataramani and Y. Bresler considered a more general MIMO sampling for multiband signals in the frame setting. In this work, we consider the VSE problem by using the Riesz basis method, which enables us to clarify obscurities in some of the previous works related to GSE and VSE problem. We obtain necessary and sufficient conditions for a VSE formula to hold as a Riesz basis expansion in the MIMO system. We also obtain an upper bound of the aliasing error which occurs when we apply the VSE formula to non-band-limited vector signals. (c) 2007 Elsevier Inc. All rights reserved.

关键词： Vector sampling expansion multi-input multi-output system Riesz basis method Aliasing error

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Research on Mach number control compensation decoupling for wind tunnel

Liuti Lixue Shiyan yu Celiang/Experiments and Measurements i...

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Liuti Lixue Shiyan yu Celiang/Experiments and Measurements in Fluid Mechanics 2005年第1期19卷 79-82+108页

作者： Zhao, Shu-Jun Chi, Yan Shi, Hong-Chang Tang, Xiao-Dong China Aerodynamics Research and Development Center Mianyang 621006 China

There exist a close coupling relation between the wind tunnel flow field parameters, total pressure and Mach number. It is great important to solve the coupling problem of total pressure and Mach number, and useful to improve the control accuracy of system, to reduce adjustment time, to reforce system stability and robust. First, objected to a wind tunnel field flow, its logic model is constructed. Then, from the view point of compensation decoupling, decoupling arithmetic based on multi-variable sub-space and decoupling compensation factors is given, the parameter decoupling model of wind tunnel flow field is constructed. Last, a series of simulation experiment proves the effectiveness of the arithmetic.

关键词： Compensation factors Decoupling multi-input multi-output system Wind tunnel field

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Interactions and multivariable design of STATCOM AC and DC voltage control

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INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY systemS 2003年第5期25卷 387-394页

作者： Wang, HF Univ Bath Dept Elect & Elect Engn Bath BA2 7AY Avon England

A static synchronous compensator (STATCOM) may be equipped with several controllers to perform multiple control functions. However, in this paper, a study case of negative interactions between STATCOM AC and DC control is reported, which indicates that the conventional arrangement of multiple controllers for STATCOM various control functions may not always be appropriate. Hence, it is suggested that the multiple control functions of the STATCOM are implemented by a single multivariable controller, which is designed by treating the STATCOM installed in a power system as a multi-input multi-output control system. In this paper, an example is demonstrated, where a single two-variable controller is successfully designed to perform both STATCOM AC and DC voltage control function. (C) 2003 Elsevier Science Ltd. All rights reserved.

关键词： static synchronous compensator multi-input multi-output system voltage control

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Robust iterative learning control for a class of nonlinear systems

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AUTOMATICA 1998年第8期34卷 983-988页

作者： Xu, JX Qu, ZH Natl Univ Singapore Dept Elect Engn Singapore 119260 Singapore Univ Cent Florida Dept Elect Engn Orlando FL 32826 USA

A novel nonlinear control scheme-robust iterative learning control (RILC) is developed in this paper. The new robust ILC system provides a general framework targeting at synthesizing learning control and robust control methods with the help of Lyapunov's direct method, thereafter being able to handle more general classes of nonlinear uncertain systems. In the proposed control scheme, learning control and variable structure control are made to function in a complementary manner. The nonlinear learning control strategy is applied directly to the structured system uncertainties which can be separated and expressed as products of unknown state-independent functions and known state-dependent functions. For non-structured system uncertainties associated with known bounding functions as the only a priori knowledge, variable structure control(VSC) strategy is applied to ensure the global asymptotic stability. In addition, important issues regarding the objective trajectory categories, resetting condition, derivative signal requirement and their relationships have been made clear in this paper. (C) 1998 Elsevier Science Ltd. All rights reserved.

关键词： iterative learning control robust nonlinear control multi-input multi-output system

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