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Séminaires scientifiques ...

par Laurent Krähenbühl - publié le , mis à jour le



  • Mardi 23 janvier 12:30-14:00 -

    Séminaire MIS (PhD Club) : Peng WANG

    Résumé :

    Active vibration control of a specific zone on the flexible structure by using smart materials
    ... détails ...

    Lieu : ECL, H9, salle à préciser

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23/01/2018, 12h30 : Peng WANG (PhD Club)

ECL, H9, salle à préciser

Active vibration control of a specific zone on the flexible structure by using smart materials

This work proposes a methodology that deals with a specific active vibration control problem, which is the vibration attenuation of a specific zone on a flexible beam. A force disturbance in a wide frequency range that contains more than 10 vibration modes is considered and the vibration in the central zone of the beam is reduced. Multiple piezoelectric patches are used as actuator-sensor pairs and their positions are carefully chosen. The mathematical model of the beam-piezo system is first built and then corrected by Grey-box identification technique. Based on the model, a special output signal is constructed whose power represents the vibration energy in the central zone. A new model reduction technique is proposed to reduce the order of the model based on control objective and then H∞ robust control is performed to give a MIMO feedback controller that minimize the power of the constructed signal. The spill-over problem is also eliminated by considering in the controller design the error between the complete model and the reduced model. The effectiveness of the controller is verified by both simulation and experiment.

Ci-dessous la liste des derniers séminaires :

21/12/2017, 14h00 : Miguel A. Davó (GIPSA-Lab)

INSA St-Exupéry, salle à préciser

Looped-functional approach for hybrid infinite-dimensional systems

This talk focus on the stability analysis of two particular hybrid infinite-dimensional systems : linear impulsive delay dynamical systems with the application to reset control for time-delay systems,
and linear hyperbolic systems with sampled data control. In general, the Lyapunov stability results for these systems are based on a monotonous decrement of the Lyapunov functional along the trajectories. This talk shows how the looped-functional approach and dwell-time constraints can be used to relax these classical conditions for these two systems. The main idea of the results is the combination of the continuous dynamics and the discrete dynamics by a proper election of the looped-functional.

19/12//2017, 14h00 : Alessandro Arduino (doctorant, Pol. di Torino)

INSA, bât. L. de Vinci, 4ème étage

Mesure de conductivité électrique par IRM

21/11/2017, 12h30 : Arthur Perodou

ECL, H9, Salle TIC (PhD Club)

Automatic Control for RF Filters Design and Analysis

The current and future explosion of autonomous communicating devices (smartphones, drones, IoT…) and of data to be transmitted, produces an exponential growth of RadioFrequency (RF) standards. All solutions devised to handle this demand (Carrier Aggregation, Multiple-Antenna Systems…) need to design passive RF filters with industrial requirements (performance, energy autonomy, size, cost…) ever higher. The increasing complexity of the design problem prevents from using traditional methods, and a new design methodology, with a theoretical foundation, is then needed.

To tackle this issue, experts from applicative (CEA-LETI) and theoretical (INL) Electronics design perspectives, and experts in methodology for systems synthesis and analysis (AMPERE), are collaborating through this PhD. The aim is to develop and adapt generic Automatic Control methods in order to take into account specific constraints of this challenging application : the synthesis of passive RF filters. The objectives are then twofold : to reduce complexity of the filters design problem and to develop methods for analysing the robustness of the resulting filters to the many sources of uncertainties.

The proposed approach is to formulate the classical problem of designing LC filters under the framework of post-modern Control theory. Several benefits are then expected. It will first enable to solve optimally the design problem, for instance with the minimal number of components. Using the genericity of Control tools, the design problem of BAW filters design may then be considered and solved in an efficient way, using convex optimization. Finally, a robust analysis of the resulting filter may be achieved, giving the worst case in which the filter still satisfies the performance requirements.

The presentation will present the first results of this approach.

13/11/2017, 14h00 : Giacomo Casadei (post-doc CNRS, Gipsa-lab)

ECL, H9, Bourbonnais

Synchonrization of nonlinear systems by means of the internal model principle : a nonlinear regression approach to solve the problem of unknown leader

In this presentation we consider the problem of synchronisation of nonlinear heterogeneous agents. It turns out that that, an internal model principle is a necessary and sufficient condition for heterogeneous systems to achieve synchronisation. However, the internal model principle asks for all the agents to know the dynamics of a common exo-system generating the final synchronisation trajectory. This assumption is often not applicable since in many cases the agents do not know/do not share the knowledge of this trajectory "a priori".
In order to cope with this problem, we consider the problem of synchronisation in a network of heterogeneous nonlinear agents on a family of different desired trajectories generated by an unknown leader. We design a set of local reference generators and local controllers which guarantees that the agents achieve consensus on all possible trajectories inside this family robustly. The design of the local reference generators is based on the possibility to express the trajectory of the leader as a nonlinear regression law which is parametrized by some constant unknown parameters.

Liens vers tous les séminaires de 2017