Patent ID: 11898498
Assignee: ROLLS-ROYCE PLC
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  B | IPC F

Claim 14:
15. 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.