http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Robust H∞ Static Output Feedback Stabilization of T-S Fuzzy Systems Subject to Actuator Saturation
Dounia Saifia,Mohammed Chadli,Salim Labiod,Thierry Marie Guerra 제어·로봇·시스템학회 2012 International Journal of Control, Automation, and Vol.10 No.3
This paper proposes a method for designing robust H∞ static output feedback stabilization of Takagi-Sugeno (T-S) fuzzy systems under actuator saturation. In this paper, the input saturation is represented by a polytopic model and the modeling error is assumed a norm-bounded uncertainty. A set invariance condition for robust H∞ static output feedback system under actuator saturation is first established. Then, the estimation of the largest domain of attraction for the system is formulated and solved as a Linear Matrix Inequality (LMI) optimization problem. Two examples are used to demonstrate the ef-fectiveness of the proposed design method.
A Novel Approach of Admissibility for Singular Linear Continuous-time Fractional-order Systems
Saliha Marir,Mohammed Chadli,Djillali Bouagada 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.2
This paper deals with the admissibility problem of linear descriptor fractional-order systems having fractionalorders between 0 and 1. Necessary and sufficient admissibility conditions are obtained in terms of strict linearmatrix inequalities. Then an observer-based controller is designed for the closed-loop system to be admissible. Numericalexamples are presented to show the applicability of the proposed results.
Sofiane Bououden,Mohammed Chadli,Lixian Zhang,Ting Yang 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.1
This study investigates the problem of robust model predictive control (RMPC) for active suspensionsystems with time-varying delays and input constraints. The uncertainty is of convex polytopic type. Based onthe Lyapunov-Krasovskii functional method, sufficient stability conditions of the time-varying delays systems arederived by linear matrix inequalities (LMIs) terms. At each time set, a feasible state feedback is obtained byminimizing an upper bound of the ‘worst-case’ quadratic objective function over an infinite horizon subject toconstraints on inputs. Finally, a quarter-vehicle model is exploited to demonstrate the effectiveness of the proposedmethod.
Design of Robust Fault Detection Observer for Takagi-Sugeno Models Using the Descriptor Approach
Maha Bouattour,Mohammed Chadli,Mohamed Chaabane,Ahmed El Hajjaji 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.5
This paper deals with the design of a robust fault detection observer for a Takagi-Sugeno (T-S) fuzzy model affected by sensor and actuator faults and unknown bounded disturbances simultaneously. An observer based on the technique of descriptor systems is studied. Indeed, by considering faults as auxiliary state variables, both states and faults are estimated simultaneously. In order to guarantee the best robustness to disturbances and sensitivity to faults, the developed observer combine the H__/H_∞ performances. Then, based on Lyapunov method, asymptotic stability conditions are given to design the observer parameters. In order to get convenient and reliable faults estimator in computations, an iterative linear matrix inequality (LMI) algorithm is developed. This algorithm, solved easily using existing numerical tools, allows to minimize influences of disturbances and maximize the ones of faults. Finally, a numerical example is proposed to illustrate the effectiveness of the result.
Ali Chibani,Mohammed Chadli,Naceur Benhadj Braiek 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.1
This paper investigates the problem of designing an unknown inputs observer to estimate states of aclass of nonlinear systems that can be modeled by polynomial fuzzy systems subject to unknown inputs. Theproposed method provides important innovations over the existing unknown inputs observers since the designedobserver has a polynomial fuzzy structure. Based on the Lyapunov approach, the proposed observer is developedto guarantee the asymptotic stability of the estimation error and sufficient design conditions are given in Sum OfSquares formulations with equality constraints. Both continuous-time and discrete-time cases are addressed andrelaxed conditions are also introduced by using intermediate variables that can be easily solved via numerical tools. Finally, an illustrative example is given to provide the effectiveness of the proposed methodology.
Solution of intuitionistic fuzzy fractional differential equations
M. Elomari,S. Melliani,L. S. Chadli 원광대학교 기초자연과학연구소 2017 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.13 No.3
In this work, we studies the solution concept of fractional differential equations with intuitionistic fuzzy initial data under generalized fuzzy Caputo derivative.
On the convergence of series of fuzzy numbers
Elhassan ElJaoui,Said Melliani,L. Saadia Chadli 원광대학교 기초자연과학연구소 2022 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.23 No.2
In this paper, we study some criteria for three types of convergence of series of fuzzy numbers, using the usual order relation ex- tended to intervals and fuzzy numbers. Then, we prove a fuzzy version of Abel theorem for fuzzy series, we introduce the fuzzy Cauchy product of two fuzzy series, which we apply to prove the main properties of the exponential of a fuzzy number. To illustrate our theoretical results, we exhibit some examples namely the fuzzy geometric and telescopic series.
Stabilisation of locally Lipschitz non-linear systems under input saturation and quantisation
Rehan, Muhammad,Tufail, Muhammad,Ahn, Choon Ki,Chadli, Mohammed IET 2017 IET CONTROL THEORY AND APPLICATIONS Vol.11 No.9
<P>This study addresses the control of locally Lipschitz non-linear systems under quantisation and input saturation non-linearities. The non-linear dynamics of the systems are taken to be locally Lipschitz, rather than the conventional globally Lipschitz counterpart, to consider a generalised form of the Lipschitz non-linear systems. An ellipsoidal region containing the origin is constructed, for which the non-linear dynamics satisfy the Lipschitz condition in contrast to the conventional approaches. Saturation and quantisation non-linearities are dealt using a generalised local sector condition and a bound on the quantisation noise. A regional control strategy for the stabilisation of non-linear systems using state feedback is devised by employing these conditions, which is further extended to attain robustness against external perturbations. The proposed control strategies guarantee convergence of the states of a non-linear system inside a bounded reducible region in the neighbourhood of the origin. In contrast to the conventional approaches, the present study considers ellipsoidally Lipschitz non-linear systems, supports various types of quantisers, ensures attenuation of the disturbances, and provides a clear picture of the region of stability. An example of the application of the proposed control strategies for a modified Chua's circuit is demonstrated.</P>
Chad Anderson 한국문화정책학회 2015 문화정책 Vol.2 No.2
The City of Incheon South Korea underwent massive urban development programs during the administration of Mayor Ahn Sangsoo, building on the success of Incheon International Airport, now rated as a top airport in the world. Like the Incheon International Airport, New Songdo is built on land reclaimed from the sea and is connected to Incheon International Airport. New Songdo is both a new town and an international business district, and is designed to be an eco-city and a smart city or ubiquitous city, a city designed to have wireless networked ubiquitous information systems. Songdo is a mix of unusual and contrasting scenes. In some ways it is typical of Korean new towns with concentrated high-rise luxury apartments being built as fast as they can be occupied, and often before local amenities are constructed to serve them. On the other hand the district features an unusual number of parks and natural amenities for a Korean neighborhood, with major parks separating residential housing from high-tech business parks. The neighborhood features a significant number of universities and other research institutions, as well as an international school and other high rated primary and secondary schools. The district is also unusually international in its composition for a Korean neighborhood, with large numbers of foreign residents and English speakers and businesses that cater to them. What face best defines the Scene of New Songdo? An investigation of the amenities in the neighborhood revealed a scene that was much like that of Seoul, but more glamorous, more statist, more corporate, and more rational-much like the usual scene in new town developments. There was less in the scene to reflect the common descriptions of eco-city, smart city, u-city, aerotropolis, or international city. The most expensive private development appears like a usual Korean development town without the urban conflict and likewise could use more utilitarian and exhibitionistic features to speed development as the neighborhood defines itself.