Robust harmonic control for vibration suppression on helicopters

Helicopters have nice abilities like hovering and landing vertically thanks to the main rotor. Inherent to it there are important drawbacks related to noise and vibrations which make the helicopter inadequate to some situations and uncomfortable. With the purpose of reducing vibrations different technologies have been developed. In the case of this thesis High Harmonic Control (HHC) have been approached with an SISO overview of the LQ optimal control and a comparison between an structured and unstructured H1 robust control. The results showed faster response of the structured controller without great differences in terms of attenuation compared with the unstructured controller.