Rotor carrier structure with a damper device for avoiding unstable coupling between resonant vibration modes

A carrier structure for a rotor of a flying machine, the carrier structure comprising:

• a mounting structure supported by an airframe and suitable for being engaged with the rotor, the mounting structure including a gearbox having a top portion adjacent to the rotor and a bottom portion adjacent to the airframe and connected in a rigid manner to the rotor mast, the rotor having a rotor mast and a rotor head with elements between the bottom portion and the rotor head being rigid, the mounting structure having a plurality of suspension bars connecting the top portion of the gearbox to the airframe, and a plurality of fastener elements rigidly connecting the bottom portion of the gearbox to the airframe;
• and
• an anti-coupling vibration-damper mechanism connected to the gearbox and configured to act as a resonator to prevent aeroelastic instabilities due to vibrational coupling between vibration modes of the carrier structure and vibration modes of the rotor, the mechanism having a flapping weight element, a first deformable member connecting the weight element to the mounting structure and restraining the mobility of the weight element, and a damper interposed between the weight element and the mounting structure for damping the movement of the weight element.