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
Life of this patent
Estimating the term…
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.
Claims16
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, where Ri=2, 3, 4, 5 or 6;
- and
- manufacturing a gearbox in accordance with the gearbox setup in dependence on the comparison as follows:
- comparing the speed ratio R with the predefined interval around the integer Ri comprises determining whether or not the speed ratio R is within the predefined interval around the integer Ri;
- and
- manufacturing the gearbox in accordance with the gearbox setup only when the speed ratio R is not within:
- the predefined interval around the integer Ri;
- the predefined interval around the integer Ri−1;
- the predefined interval around the integer Ri+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 chosen from the first and second shafts depending on a speed ratio of speeds, wherein controlling rotation of the at least one chosen from the first and second shafts depending on the speed ratio is performed so as to avoid an integer ratio of speeds of the first and second shafts;
- determining a level of vibrations at the apparatus and comparing the level of vibrations with a predetermined threshold, wherein controlling rotation of at least one of the shafts depending on a speed ratio R of speeds of the shafts is performed when the level of vibrations exceeds the predetermined threshold.
An apparatus for a gas turbine comprising:
- at least a first shaft and a second shaft that are rotatable with a variable ratio of speeds;
- a control system, the control system being adapted to control rotation of at least one chosen from the first and second shafts depending on a speed ratio of speeds, wherein controlling rotation of the at least one chosen from the first and second shafts depending on the speed ratio is performed so as to avoid an integer ratio of speeds of the first and second shafts;
- providing a database storing a plurality of possible operational statuses of the apparatus and appropriate speeds of the first and second shafts for each operational status having no integer ratio;
- and
- controlling the apparatus using the database, wherein the database comprises at least one series of possible successive operational statuses and appropriate speeds of the first and second shafts for each operational status having no integer ratio.
Dependencies are inferred from the claim text.