Active Vibration Control In A Rotor System Using An Eletromagnetic Actuator With H∞ Norm
Résumé
In recent years, a number of new methods dedicated to acoustic and vibration attenuation have been developed and proposed to handle several problems in engineering. This is due to the demand for better performance and safely operation of mechanical systems. There are various types of actuators available. The present contribution is dedicated to the electromagnetic actuator (EMA). EMA uses electromagnetic forces to support the rotor without mechanical contact. Due to the size of the system model, it was necessary to reduce the model of the rotating system. For this aim the balanced realization technique was used to organize the modes of the system so that the main modes (with respect to the dynamic behavior of the system) are considered. The control design for the discrete state-space formulation is carried out through a feedback technique and the H∞ norm was solved by using Linear Matrix Inequalities (LMI). State observers were used to estimate some states of the system since it is not practical from the experimental view point to measure all the states of the system. The design of the state observers was performed by using LMIs. Finally, simulation results demonstrate the effectiveness of the methodology conveyed