Refinement of finite element model of integrally bladed disk
AssigneeBlade Diagnostices Corporation
InventorsDrew M. Feiner, Jerry H. Griffin
Life of this patent
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Abstract
A reduced order model of an integrally bladed turbine disk (IBD) is used with experimental vibrational test data to modify a finite element model (FEM) of the IBD so that the FEM more accurately predicts the vibrational mistuning of the disk. The refined FEM can be used to evaluate a proposed modification of the IBD before the hardware is actually modified, and to evaluate the actual modification if there is a difference between the proposed and actual modifications.
Claims16
A method comprising using a reduced order model of a component and vibratory test data of the component to refine a finite element model of the component, wherein the component is an integrally bladed disk (IBD), further comprising:
- measuring dimensions of the IBD;
- constructing a geometrically mistuned finite element model of the IBD to reflect the measured dimensions;
- obtaining a reduced order model of the IBD reflecting characteristics of the IBD output from the geometrically mistuned finite element model;
- measuring an actual vibratory response of the IBD;
- using the actual vibratory response as input to the reduced order model to calculate a residual mistuning of the IBD not predicted by the geometrically mistuned finite element model;
- and
- refining the geometrically mistuned finite element model to reduce the residual mistuning.
A method comprising using a reduced order model of a component and vibratory test data of the component to refine a finite element model of the component, wherein the component is an integrally bladed disk (IBD), further comprising:
- measuring a vibration signature of the IBD responsive to an excitation;
- calculating mistuned blade frequencies of the IBD using the vibration signature as an input to a reduced order model of the IBD;
- calculating mistuned blade frequencies of the IBD using a finite element model of the IBD;
- comparing the mistuned blade frequencies of the IBD calculated with the reduced order model and the mistuned blade frequencies of the IBD calculated with the finite element model to determine a residual mistuning;
- and
- refining the finite element model to reduce the residual mistuning.
Dependencies are inferred from the claim text.