Systems and methods for reducing effects of torsional oscillation for electrical power generation

A method of operating a power unit of an aircraft propulsor, the method comprising:

• rotating a variable frequency generator with a gear train, wherein the gear train has an associated torsional oscillation frequency;
• inducing a magnetic field in the variable frequency generator with exciter circuitry in response to an excitation signal;
• generating electrical power with the variable frequency generator and receiving the electrical power with compensation circuitry;
• adjusting, independent of movement of the variable frequency generator and based on one or more stored characteristics of the gear train, the excitation signal with compensation circuitry in accordance with a predetermined frequency range, wherein at least one of the characteristics is associated with the torsional oscillation frequency;
• and
• applying the adjusted excitation signal to the exciter circuitry to filter effects of the torsional oscillation frequency of the gear train in the electrical power provided by the variable frequency generator.

An aircraft comprising:

• a fuselage;
• a wing;
• and
• an aircraft propulsor coupled to the fuselage and/or the wing, the aircraft propulsor comprising:
• a power unit,
• a gear train coupled to the power unit, wherein the gear train has an associated torsional oscillation frequency,
• a variable frequency generator coupled to the gear train,
• exciter circuitry to induce a magnetic field in the variable frequency generator in response to an excitation signal to generate electrical power by the variable frequency generator in response to rotation of the gear train, and
• compensation circuitry electrically coupled to the exciter circuitry, wherein the compensation circuitry comprises a controller that adjusts, independent of movement of the variable frequency generator and based on one or more characteristics of the gear train, the excitation signal in accordance with a predetermined frequency range to filter effects of the torsional oscillation frequency of the gear train in the electrical power provided by the variable frequency generator, wherein the one or more characteristics are stored in a memory of the compensation circuitry, and wherein at least one of the characteristics is associated with the torsional oscillation frequency.