Method to determine inertia in a shaft system
AssigneeROLLS-ROYCE plc
InventorMarko Bacic
Life of this patent
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Abstract
A method to determine inertia of components of a rotating shaft system. The shaft system includes a shaft coupling a turbine to drive the rotation and a load to be driven by the rotation. The method includes steps to: apply a feedback to a forcing input to the shaft system; measure resonant frequency of the shaft; iterate steps 1.a) and 1.b) for different feedbacks; plot resonant frequency squared against gain; and determine inverse of gradient from the plot to give inertia of the turbine. Also a method to determine shaft stiffness using the inertia of the turbine.
Claims16
A method to determine inertia of components of a rotating shaft system;
- the shaft system comprising a shaft coupling a turbine to drive the rotation and a load to be driven by the rotation;
- the method comprising steps to:
- a) apply a feedback to a forcing input to the shaft system, wherein the feedback comprises a gain;
- b) measure resonant frequency of the shaft;
- c) iterate steps a and b for different feedbacks;
- d) plot resonant frequency squared against gain;
- and
- e) determine inverse of gradient from the plot to give inertia of the turbine.
Dependencies are inferred from the claim text.