Vibration H-infinity control with constrained force signal / Controle H-infinito de vibrações com restrições no esforço de controle

AUTOR(ES)

Ruth Vanessa Canahuire Cabello

DATA DE PUBLICAÇÃO

2009

RESUMO

In this work, the H8 control of vibrations problem taking into account the effects of saturation of actuators is studied. Two situations of interest were explored. The first one considers that saturation should be avoided and does not cause damage to the system, even if this situation leads to loss of performance. The second alternative seeks to modify the controller to achieve better performance, even when the saturation occurs. The design of H8 controllers was done using the formulation based on linear matrix inequalities (LMI). The techniques that avoid saturation are the weighting functions selection, selecting of the weight of the control signal as a performance output of the optimization problem, the scaling of the output matrix of the controller and the inclusion of an additional restriction in the form of LMI to limit the control effort. A technique that seeks to improve performance, even in the presence of saturation, is the controller modification using the methodology known as Anti-windup. These techniques were evaluated in two problems of control of vibrations: a mass-springdamper system of two degrees of freedom and a flexible beam. These techniques were implemented using MATLAB and with the application of specific tools to solve problems of optimization with restrictions in the form of LMI, such as Yalmip, SeDuMi and SDPT3. The results for these two examples are discussed in the work

ASSUNTO(S)

vibração - controle programação convexa control vibration sistema de controle por realimentação feedback control systems convex programming

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