Posicionamento de sensores/atuadores e escolha de funções de ponderação no controle H-infinito de vibrações / Placement of sensors/actuators and selection of weighting functions in H-infinity control of vibrations

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

23/02/2012

RESUMO

In this work it was used the H infinite control to atenuate vibrations in mechanical structures. Linear matrix inequalities are used to find the optimal controller. Sensors and actuators are incorporated into the project. To determine the best place to allocate them in the structure two methods are used: the first is based on the highest closed-loop H infinite norm and the second is based on the lowest open-loop H infinite norm. The structure to be controlled was modeled through the finite element method. After determining the optimal placement to allocate sensors and actuators, the loop was closed and H infinite controllers were designed with weighting filters that were chosen via genetic algorithms for both cases of positioning. To design the H infinite controller, a reduced model of the plant was used, disregarding the residual modes. Weighting filters are found through genetic algorithms to determine the frequency bands of interest in order to design a controller with less conservatism and avoiding the phenomenon of spillover, and consequently, unstable closed loop. The application examples were based in a flexible beam structure. The results showed that the designed controllers, after the optimal placement of sensors and actuators and choosing the best parameters for the weighting functions, minimized the amplitude of vibration of the structure, ensuring system stability.

ASSUNTO(S)

sistemas de controle por realimentação vibração - controle controle h [infinito] algoritmos genéticos feedback control systems vibration h infinity control genetic algorithms

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