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US 2022/0065196 A1Published application
Aircraft engine with improved handling of vibrational modes
AssigneeROLLS-ROYCE plc
InventorsMatthew SILVESTER, Geoffrey HUGHES
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AssigneeROLLS-ROYCE plc
InventorsMatthew SILVESTER, Geoffrey HUGHES
Estimating the term…
A gas turbine engine having a reverse travelling wave first flap mode, Fan RTW, and including a fan located upstream of the engine core; a fan shaft; a front engine structure arranged to support the fan shaft and having a front engine structure nodding mode including a pair of modes at similar, but not equal, natural frequencies in orthogonal directions; and a gearbox. An LP rotor system including the fan system and a gearbox output shaft arranged to drive the fan shaft first reverse and first forward whirl rotor dynamic modes, Rotor RW, and 1FW. The engine has a maximum take-off speed, MTO. A mutual frequency margin of: the frequency difference between mode Fan RTW and mode Rotor RW at the MTO speed ( the lowest frequency of either mode Fan RTW or Rotor RW at the MTO speed + the MTO speed ) is in the range from 5 to 50%.
A gas turbine engine for an aircraft comprising:
A method of operation of a gas turbine engine for an aircraft, the engine having a maximum take-off (MTO) speed, and comprising:
Dependencies are inferred from the claim text.