Mounting assembly for a gearbox assembly

A gas turbine engine comprising:

• a fan, a compressor section, a turbine section that includes a low-pressure shaft and a high-pressure shaft, and a combustion section in flow communication with the compressor section and the turbine section;
• an engine static structure;
• an electric power system comprising:
• a low-pressure electric machine drivingly coupled to the low-pressure shaft and generating electricity as a first type of current;
• a high-pressure electric machine drivingly coupled to the high-pressure shaft and generating electricity as the first type of current;
• a plurality of low-pressure power converters electrically coupled with the low-pressure electric machine, the plurality of low-pressure power converters converting the electricity as the first type of current from the low-pressure electric machine to a second type of current;
• a plurality of high-pressure power converters electrically coupled with the high-pressure electric machine, the plurality of high-pressure power converters converting the electricity as the first type of current from the high-pressure electric machine to the second type of current;
• and
• a plurality of power distribution management units electrically coupled with the plurality of low-pressure power converters and the plurality of high-pressure power converters, the plurality of power distribution management units supplying the electricity as the second type of current to at least one of the gas turbine engine or one or more aircraft systems of an aircraft, wherein the plurality of power distribution management units includes a first power distribution management unit and a second power distribution management unit that are integrated together in a power distribution management unit housing;
• a gearbox assembly configured to transfer rotational energy from the turbine section to the fan;
• and
• a mounting assembly for coupling the gearbox assembly to the gas turbine engine, the mounting assembly having:
• a flex coupling configured to mount a first gear of the gearbox assembly to the low-pressure shaft of the gas turbine engine;
• a flex mount configured to mount a second gear of the gearbox assembly to the engine static structure;
• and
• a fan frame configured to mount a third gear of the gearbox assembly to the engine static structure,
• wherein each of the flex coupling and the flex mount is characterized by a lateral impedance parameter ratio, a bending impedance parameter ratio, and a torsional impedance parameter ratio,
• wherein the lateral impedance parameter ratio of the flex coupling, the flex mount, or both is less than or equal to 0.5,
• wherein the bending impedance parameter ratio of the flex coupling, the flex mount, or both is less than or equal to 0.5, and
• wherein the torsional impedance parameter ratio of the flex coupling, the flex mount, or both is greater than or equal to 0.1.