US 11,852,084 B2
Method of optimizing the noise generated in flight by a rotorcraft
Nayibe Gomez, Aix en Provence (FR)
Assigned to AIRBUS HELICOPTERS, Marignane (FR)
Filed by AIRBUS HELICOPTERS, Marignane (FR)
Filed on Mar. 27, 2020, as Appl. No. 16/832,589.
Claims priority of application No. 1903327 (FR), filed on Mar. 29, 2019.
Prior Publication US 2020/0309045 A1, Oct. 1, 2020
Int. Cl. F02D 35/00 (2006.01); B64D 27/02 (2006.01); B64D 27/10 (2006.01); B64D 27/24 (2006.01); B64D 31/06 (2006.01); F01N 1/00 (2006.01)
CPC F02D 35/0007 (2013.01) [B64D 27/02 (2013.01); B64D 27/10 (2013.01); B64D 27/24 (2013.01); B64D 31/06 (2013.01); F01N 1/00 (2013.01); B64D 2027/026 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method of optimizing noise generated by a hybrid power plant of a rotorcraft during a flight phase, the hybrid power plant being provided with at least one engine and with at least one electric machine;
wherein the method includes the following steps:
a determination step for determining a required power to be delivered by the hybrid power plant for the flight phase; and
a distribution step for distributing the required power between the engine(s) and the electric machine(s) as a function of a target noise level, of the required power for the flight phase, and of a model for a noise generated by the engine(s) depending on an operating parameter of the engine(s);
wherein the distribution step includes the following sub-steps:
a first determination sub-step for determining a main power to be delivered by the engine(s) so that the engine(s) generate(s) a sound level less than or equal to the target noise level, the main power being determined as a function of the target noise level and of the model for the noise generated by the engine(s); and
a second determination sub-step for determining a first supplementary power to be delivered by the electric machine(s) so that the hybrid power plant delivers the required power; and
when the first supplementary power is less than or equal to an available power of the electric machine(s), the distribution step includes the following sub-steps:
a first control sub-step for causing the electric machine(s) to deliver the first supplementary power; and
a second control sub-step for causing the engine(s) to deliver the main power; and
when the first supplementary power is greater than the available power, the distribution step includes the following sub-steps:
a third control sub-step for causing the electric machine(s) to deliver a reduced first supplementary power that is equal to the available power; and
a fourth control sub-step for causing the engine(s) to deliver an increase main power so that the hybrid power plant delivers the required power.