Method and system for reducing cross-shaft vibrations
AssigneesRolls-Royce Deutschland Ltd & Co KG, ROLLS-ROYCE plc
InventorsGreg BLAKE, Lucia CICIRIELLO, Mark SPRUCE, Matthew WILSON
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Abstract
Embodiments of the invention are shown in the figures, where a method for manufacturing a gearbox, the method comprising: providing a predefined interval around an integer; providing a gearbox setup; determining a speed ratio of at least two components of the gearbox setup; comparing the speed ratio with the predefined interval around the integer; and manufacturing a gearbox in accordance with the gearbox setup in dependence on the comparison.
Claims20
A method for manufacturing a gearbox, the method comprising:
- providing a predefined interval around an integer Ri;
- providing a gearbox setup;
- determining a speed ratio R of at least two components of the gearbox setup;
- comparing the speed ratio R with the predefined interval around the integer Ri;
- and
- manufacturing a gearbox in accordance with the gearbox setup in dependence on the comparison.
A gearbox, comprising a plurality of components, wherein for each pair of the plurality of components that are rotatable with respect to a fixture at a fixed speed ratio R the speed ratio R fulfils the following requirement:
- (
- R
-
- i
- 2
- +
- k
- )
- 2
- <
- R
- <
- (
- (
- R
-
- i
- +
- 1
- )
- 2
- -
- k
- )
- 2
- ,
- wherein Ri is an integer and k is an integer of at least 1.
A method for controlling an apparatus of a gas turbine having at least a first shaft and a second shaft that are rotatable, the method comprising controlling rotation of at least one of the shafts depending on a speed ratio of speeds, wherein controlling rotation of the at least one of the shafts depending on the speed ratio is performed so as to avoid an integer ratio of speeds of the shafts.
An apparatus for a gas turbine comprising at least a first and a second shaft that are rotatable with a variable ratio of speeds, and a control system, the control system being adapted to control rotation of at least one of the shafts depending on a speed ratio of speeds, wherein controlling rotation of the at least one of the shafts depending on the speed ratio is performed so as to avoid an integer ratio of speeds of the shafts.
Dependencies are inferred from the claim text.