Two effective strategies of ensuring the safety, robustness and structural health of mechanical systems are fault detection and vibration attenuation. Dynamic vibration absorbers (ADV's) are widely employed on the vibration attenuation in structures, but they do not show satisfactory results in systems with variation of the excitation frequency, since they are limited in the frequency band that they are able to control. To overcome this problem, a several reseachers use magnetorheological buffer (MR) as an ADV. This type of system presents robustness problems because they consider all variables to be instrumental, which does not occur in real vibration problems, or they do not consider faults in the performance of the MR damper. Therefore, this work proposes a new control methodology, where state observers will be used to estimate values not available by the sensors and they will be used in the detection of performance failures of the MR damper, performing a more secure and robust vibration control. The mathematical model to be used in the controller design will be constructed by identification of the modal parameters to obtain the excitation force without using a force transducer.
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