# US 11,905,845 B1 · Method and system for repairing turbine airfoils

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- Number: US 11,905,845 B1
- Document ID: US11905845B1
- Status: Granted
- Kind: B1
- Application number: 17/958,488
- Filed: 2022-10-03
- Granted: 2024-02-20
- Earliest claimed: 2021-10-21
- Assignees: The United States of America as represented by the Secretary of the Air Force
- Applicants: Government of the United States, as represented by the Secretary of the Air Force
- Inventors: Daniel Gillaugh; Alexander Kaszynski; Jeffrey Brown
- Web page: https://patentgrep.com/patent/US11905845B1

## CPC

- F01D 5/005: {Repairing methods or devices}
- G01M 1/30: Compensating imbalance
- G01M 5/0016: {of aircraft wings or blades}
- G01M 5/0066: {by exciting or detecting vibration or acceleration (vibration testing of structures G01M7/00)}
- G01M 15/14: Testing gas-turbine engines or jet-propulsion engines
- F05D 2230/80: Repairing, retrofitting or upgrading methods
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

The present disclosure is directed to a method and system for repairing a blade for a turbomachine that has been damaged due to foreign object impact. Machine learning algorithms are used to determine an amount of material to be removed from one or more damage locations and determine an amount of material addition to the damaged portion(s) and/or at other locations on the blade to keep the natural frequencies of the repaired blade within design limits during operation.

## Claims

### Claim 1

A system for repairing a blade on a rotor comprising:
a measuring device configured to measure a size of a damaged portion of a blade;
a computer system operable for analyzing the blade and the damaged portion thereof;
wherein the computer system includes machine learning algorithms operable to determine an amount of damaged material to remove from the blade; and
wherein the computer system uses the machine learning algorithms to determine the amount of material addition and corresponding one or more locations on the blade to keep the natural frequencies of the blade within threshold design limits;
wherein a damaged material is removed from the damaged portion of the blade and a new material is added to a different location on the blade to change the operating frequency of the blade.

### Claim 2 (depends on 1)

The system of claim 1, wherein the size of the damaged portion includes a defined perimeter and a defined depth thereof.

### Claim 3 (depends on 1)

The system of claim 1, wherein the measuring device is an optical device operably connected to computer system.

### Claim 4 (depends on 1)

The system of claim 1, wherein the new material is added to the damaged portion of the blade prior to blending a repaired blade profile.

### Claim 5 (depends on 1)

The system of claim 1, wherein the blade is used in one of a gas turbine engine, a fluid pump, a propeller, or a wind turbine.