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Abstract

In this paper we propose a new active control strategy to control the dynamic behavior of flexible structures: fuzzy modal control (FMC). This strategy, based on the modal state feedback of the structure, uses independent fuzzy controllers for each mode to be controlled. This method is applied to a flexible beam controlled by a transverse plane of action using piezoelectric actuators. First of all, a model of a piezoelectric actuator is proposed, followed by the formulation of a finite-element model of the mechanical structure/actuator. The model is then fitted using an identification of the characteristics. After modal reduction, the FMC is carried out in two steps: the control of the beam in only one transverse direction by a piezoelectric pusher, then in two transverse directions by two orthogonal piezoelectric pushers located on the same plane. A digital controller was built in the Matlab®-Simulink® environment, and implemented on specialized cards in order to perform the corresponding experiment. The method is validated by comparing the results between the simulation and the experiment.

Keywords

Mecatronics active control fuzzy control modal control piezoelectricity flexible structure vibration

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Fuzzy Modal Active Control of Flexible Structures

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