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公开(公告)号：US10914240B2
公开(公告)日：2021-02-09
申请号：US16451677
申请日：2019-06-25
Applicant: ROLLS-ROYCE plc
Inventor： Alan R. Maguire , Geoffrey Hughes
Abstract: A gas turbine engine, in particular an aircraft engine, includes: a turbine connected via an input shaft device to a gearbox device having a sun gear, a planet carrier having a plurality of planet gears attached thereto, and a ring gear, the sun gear is connected to the input shaft device, the planet carrier or the ring gear is connected to a propulsive fan via an output shaft device of the gearbox device, with a rear carrier bearing device radially between the planet carrier and a static structure on the input side of the gearbox device or a front carrier bearing device radially between the planet carrier and a static structure on the output side of the gearbox device.
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公开(公告)号：US11359549B2
公开(公告)日：2022-06-14
申请号：US17331020
申请日：2021-05-26
Applicant: ROLLS-ROYCE PLC
Inventor： Matthew Silvester , Geoffrey Hughes
Abstract: A gas turbine engine for an aircraft includes a fan system having a reverse travelling wave first flap mode, Fan RTW, and including a fan located upstream of the engine core; a fan shaft; and a front engine structure arranged to support the fan shaft and having a front engine structure nodding mode comprising 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 has a first reverse whirl rotor dynamic mode, Rotor RW, and a first forward whirl rotor dynamic mode, 1FW. The engine has a maximum take-off speed, MTO. A backward whirl frequency margin of: the lowest frequency of either mode Fan RTW or Rotor RW at the MTO speed the MTO speed may be in the range from 15 to 50%.
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公开(公告)号：US11352958B2
公开(公告)日：2022-06-07
申请号：US17331989
申请日：2021-05-27
Applicant: ROLLS-ROYCE PLC
Inventor： Matthew Silvester , Geoffrey Hughes
Abstract: An aircraft gas turbine engine includes a fan system having a reverse traveling wave first flap mode, Fan RTW, and including a fan upstream of the engine core; a fan shaft; and a front engine structure to support the shaft and having a front engine structure nodding mode FSN including two modes at similar, but unequal, natural frequencies in orthogonal directions; and a gearbox. The engine includes a gearbox, and a gearbox output shaft to couple output of the gearbox to the fan shaft. An LP rotor system including the fan system and the gearbox output shaft has a first reverse whirl rotor dynamic mode, Rotor RW. A frequency margin of: the frequency difference between mode FSN and the highest frequency of either synchronous Fan RTW or synchronous Rotor RW the lowest natural frequency of the front structure nodding pair of modes is in the range from 5 to 50%.
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