Method and system for reducing in-flight noise of a hybrid helicopter by managing the incidence of its main rotor and the thrust of each propeller

摘要

The present invention relates to a method and system for reducing the noise generated in flight by a vortex wake caused by each rotating blade (121) of a main rotor (12) of a hybrid helicopter (10). Said hybrid helicopter (10) comprises a main rotor (12), at least two wings (15) and at least one propeller (13). Said method makes it possible during a phase of stabilized flight in level or with a non-zero aerodynamic slope to determine a value of the pitch of the second blades (131) of each propeller (13) and an incidence of said main rotor (12), then d '' applying to each propeller (13) said first pitch value and to said main rotor (12) said incidence so as to orient said vortex wake in order to limit the noisy interactions of said vortex wake with the other blades (121) of said main rotor (12) ) and / or the blades (131) of each propeller (13). Short figure: figure 1