2007 European Control Conference (ECC)

2-5 July 2007

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Displaying Results 1 - 25 of 863
  • Welcome messages

    Publication Year: 2007, Page(s):1 - 3
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  • Conference committees

    Publication Year: 2007, Page(s): xi
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  • Program

    Publication Year: 2007, Page(s):1 - 151
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  • Author index

    Publication Year: 2007, Page(s):1 - 36
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  • Keyword index

    Publication Year: 2007, Page(s):1 - 5
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  • Observer based LQ optimal boundary control of 2D heat flow by order reduction

    Publication Year: 2007, Page(s):4202 - 4208
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (414 KB) | HTML iconHTML

    Linear Quadratic (LQ) optimal boundary control of a 2D heat flow is studied. The design is carried out on a reduced order model of the Partial Differential Equation (PDE) process. For this purpose, Proper Orthogonal Decomposition (POD) technique is utilized and the Low Dimensional (LD) model is derived. The boundary controller is developed using the state information obtained via an observer. An i... View full abstract»

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  • Recursive least squares Harmonic identification in active power filters

    Publication Year: 2007, Page(s):4645 - 4650
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (197 KB) | HTML iconHTML

    A new least squares Harmonic identification technique is developed. This technique is used basically to estimate the fundamental component of the current drawn by nonlinear loads in order to calculate the reference currents of the active power filter on line. The effectiveness of the proposed technique is tested under a sudden change of the nonlinear load. The performance of the proposed technique... View full abstract»

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  • A fuzzy logic based approach to real time optimization of dynamic processes

    Publication Year: 2007, Page(s):2784 - 2790
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB) | HTML iconHTML

    Most chemical processes are operated under continuously changing conditions and thus the optimal operating conditions change with time. On-line optimization techniques of various types which are used to track these kinds of moving optimum, have sparked significant interest in recent years. A multi-variable, adaptive, fuzzy logic based approach is presented here for real-time optimization of nonlin... View full abstract»

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  • Global stability results for systems under sampled-data control

    Publication Year: 2007, Page(s):5761 - 5768
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (270 KB) | HTML iconHTML

    In this work sufficient conditions expressed by means of single and vector Lyapunov functions of Uniform Input-to-Output Stability (UIOS) and Uniform Input-to-State Stability (UISS) are given for finite-dimensional systems under feedback control with zero order hold. View full abstract»

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  • Robust pole placement of systems with polytopic uncertainty via convex optimization

    Publication Year: 2007, Page(s):204 - 210
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (338 KB) | HTML iconHTML

    Convex parameterization of fixed-order robust stabilizing controllers for systems with polytopic uncertainty is represented as an LMI using KYP Lemma. This parameterization is a convex inner-approximation of the whole non-convex set of stabilizing controllers and depends on the choice of a central polynomial. It is shown that with an appropriate choice of the central polynomial, the set of all fix... View full abstract»

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  • A modified positive-real type stability condition

    Publication Year: 2007, Page(s):3912 - 3918
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (177 KB) | HTML iconHTML

    Lightly damped structures with colocated (position) sensors and (force) actuators can typically be modeled by a (possibly infinite) sum of second order transfer functions. Since the relative degree of these systems is more than unity, they are not directly amenable to standard positive real analysis and since these systems are highly resonant, application of the small gain theorem would be usually... View full abstract»

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  • Small-gain theorem for a wide class of feedback systems with control applications

    Publication Year: 2007, Page(s):5368 - 5375
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (274 KB) | HTML iconHTML

    A Small-Gain Theorem, which can be applied to a wide class of systems that includes systems satisfying the weak semigroup property, is presented in the present work. The result generalizes all existing results in the literature and exploits notions of weighted, uniform and non-uniform Input-to-Output Stability (IOS) property. Applications to partial state feedback stabilization problems with sampl... View full abstract»

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  • Stability results for systems described by retarded functional differential equations

    Publication Year: 2007, Page(s):1982 - 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (269 KB) | HTML iconHTML

    In this work characterizations of notions of output stability for uncertain time-varying systems described by retarded functional differential equations are provided. Particularly, characterizations by means of Lyapunov functionals of uniform and non-uniform in time Robust Global Asymptotic Output Stability and Input-to-Output Stability are given. The results of this work have been developed for s... View full abstract»

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  • A systematic weight synthesis procedure for performance optimisation in ℋ loop shaping

    Publication Year: 2007, Page(s):223 - 228
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (174 KB) | HTML iconHTML

    This paper proposes a systematic method to synthesise ℋ∞ loop shaping weights that would optimise performance while maintaining a pre-specified level of optimal robust stability margin. This objective is captured by two optimisation problems expressed in the form of Linear Matrix Inequalities (LMI), which are solved by means of an iterative algorithm. This scheme will aid ... View full abstract»

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  • Vision-based robotic motion control for non-autonomous environment

    Publication Year: 2007, Page(s):1455 - 1462
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1133 KB) | HTML iconHTML

    A visual servo control system with SOPC structure is implemented on a retrofitted Mitsubishi RV-M2 robotic system. The hardware circuit has the functions of quadrature encoder decoding, limit switch detecting, pulse width modulation (PWM) generating and CMOS image signal capturing. The software embedded in Nios II micro processor has the functions of using UART to communicate with PC, robotic inve... View full abstract»

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  • Object trajectory prediction application to visual servoing

    Publication Year: 2007, Page(s):2105 - 2111
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (406 KB) | HTML iconHTML

    Visual Servoing is an important issue in robotic vision. Considering tracking as a particular case of visual servoing, motion estimation algorithms are used to predict the location of target and generate a feasible control input to keep the target in the center of the image. Several well known algorithms can be used for trajectory prediction such as Kalman filter, αβ/αβ... View full abstract»

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  • Disturbance attenuation analysis of state feedback Nash strategy for Linear Quadratic Sequential Games

    Publication Year: 2007, Page(s):3371 - 3378
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (222 KB) | HTML iconHTML

    There is limited formal mathematical analysis of one type of games - dynamic sequential games with large, or even infinitely large, planning horizons, from the point view of system controls. In this paper, we use a zero-sum game theoretical approach to address the disturbance attenuation analysis of state feedback Nash strategies for Dynamic Linear Quadratic Sequential Games (LQSGs) with uncertain... View full abstract»

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  • On the reachable set of nonlinear control systems with a nilpotent Lie algebra

    Publication Year: 2007, Page(s):4261 - 4267
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (210 KB) | HTML iconHTML

    We consider control systems that are affine in the control and whose vector fields generate a nilpotent Lie algebra. Analysis of such systems can be reduced to the analysis of the associated canonical Hall-Sussmann (HS) system. We derive several new results revealing the elegant Lie-algebraic structure of the HS system. We also prove that local, or small-time, nice reachability results imply their... View full abstract»

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  • Design of self-tuning lead-lag controllers for nonlinear systems with application to mechatronics

    Publication Year: 2007, Page(s):5827 - 5832
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (350 KB) | HTML iconHTML

    A new procedure for design of self-tuning adaptive lead-lag controllers for use with highly nonlinear systems is developed. The application of this approach to a nonlinear mechatronic system that a conventional linear control has not been successful is also demonstrated. The self-tuning block determines the parameters of the lead-lag controller by solving a set of linear algebraic equations. This ... View full abstract»

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  • On state-dependant sampling for nonlinear controlled systems sharing limited computational resources

    Publication Year: 2007, Page(s):4691 - 4698
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (653 KB) | HTML iconHTML

    In this paper, a framework for dynamic monitoring of sampling periods for nonlinear controlled systems is proposed. This framework is particularly adapted to the context of controlled systems sharing limited computational resources. The proposed scheme can be used in a cascaded structure with any feedback scheduling design. Illustrative examples are given to assess the efficiency of the proposed f... View full abstract»

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  • A new identification method for hysteretic systems: Theory and experiments

    Publication Year: 2007, Page(s):4052 - 4056
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (371 KB) | HTML iconHTML

    This paper deals with the parametric identification of the Bouc-Wen model for smooth hysteresis. The interest of the problem stems from the fact that the Bouc-Wen model has been used experimentally to represent various hysteretic systems during the last few years. However, identifying the parameters of this model is not a trivial task due to the nonlinearity of the model. In the current literature... View full abstract»

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  • Unfalsified adaptive control: A new controller implementation and some remarks

    Publication Year: 2007, Page(s):709 - 716
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (193 KB) | HTML iconHTML

    The concept of unfalsified adaptive control using multiple controllers and switching ideas has been developed and extensively investigated over the past decade [1]-[16]. In this literature of unfalsified adaptive control, it is required that the controller set only contains linear, bi-proper minimum-phase controllers. In this note, we propose a controller implementation scheme which overcomes this... View full abstract»

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  • Computation of realizations of 2D cone-systems

    Publication Year: 2007, Page(s):3011 - 3015
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB) | HTML iconHTML

    A new notion of a 2D (P,Q,V)-cone system is introduced. Necessary and sufficient conditions for the existence of a realization of a given proper transfer matrix are established. A procedure is proposed for computation of a realization of a given transfer matrix of the 2D (P,Q,V)-cone system. It is shown that there exists a realization of the transfer matrix T(z1,z2) of a 2D (... View full abstract»

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  • Some remarks on non-assignable equilibria of linear time-invariant systems

    Publication Year: 2007, Page(s):531 - 534
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (134 KB) | HTML iconHTML

    In this note we investigate the following question: given a (finite dimensional) linear time-invariant system and a constant desired value for its output. Assume there is no assignable equilibrium point corresponding to the desired output. Does there exists a (possibly dynamic, nonlinear, time-varying) controller such that the output ultimately enters a prescribed neighborhood of its desired value... View full abstract»

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  • Real-time simplified variable universe fuzzy control of PEM fuel cell flow systems

    Publication Year: 2007, Page(s):2887 - 2894
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (708 KB) | HTML iconHTML

    The problem of building an accurate model and the request of real-time control are often simultaneously encountered in the design of control systems. This paper successfully studies and implements a real-time simplified variable universe fuzzy control method in PEM fuel cell flow systems. On the one hand, the method can achieve fine control on the cathode pressure of fuel cell stacks by adjusting ... View full abstract»

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