GAS TURBINE ENGINE ROTOR ASSEMBLY OPTIMIZATION

• US 20150046126A1
• Filed: 08/08/2013
• Published: 02/12/2015
• Est. Priority Date: 08/08/2013
• Status: Active Grant

• Current Assignee: Solar Turbines Incorporated (Caterpillar Incorporated)
• Original Assignee: Solar Turbines Incorporated (Caterpillar Incorporated)
• Inventors: Kepler, Jason David, Rodriguez, Genaro
• Granted Patent: US 9,334,739 B2
• Time in Patent Office: Days
• US Class Current: 702/189
• CPC Class Codes: F01D 5/027 Arrangements for balancing for balancing rotating bodies in general F16F15/32; for compensating unbalance G01M1/36
• CPC Class Codes: F01D 5/06 Rotors for more than one axial stage, e.g. of drum or multiple disc type; Details thereof, e.g. shafts, shaft connections F01D5/022, F01D5/023 take precedence
• CPC Class Codes: F05D 2230/61 using limited numbers of standard modules which can be adapted by machining

Abstract

A method for optimizing a rotor assembly for a gas turbine engine is disclosed. The rotor assembly includes rotating parts including a first journal and one or more rotor disks. The method includes determining vector components for a total parallelism vector for each rotating part, determining a total parallelism sum including determining a magnitude of each total parallelism vector and adding the magnitudes into a single sum, and determining a minimum value for the total parallelism sum including selecting the rotor disk build angles and the second journal build angle that result in the smallest value for the total parallelism sum.

Claims

1. A method for optimizing a rotor assembly for a gas turbine engine, the rotor assembly including rotating parts including a first journal and one or more rotor disks being stacked sequentially onto the first journal, the method comprising:

determining vector components for a total parallelism vector for each rotating part, the total parallelism vector includes a parallelism magnitude and angle for a rotor stack of rotating parts up to and including the rotating part;

determining a total parallelism sum including

determining the parallelism magnitude of each total parallelism vector, and

adding the parallelism magnitudes into a single sum; and

determining a minimum value for the total parallelism sum including

selecting the rotating disk build angles and the second journal build angle that result in the smallest value for the total parallelism sum.

2. The method of claim 1, wherein the rotating parts include a second journal being stacked onto a final rotor disk of the one or more rotor disks;

and

wherein determining vector components for the total parallelism vector for each rotating part includes

determining a total parallelism ‘

I’

component for the first journal, the total parallelism ‘

I’

component for the first journal being a parallelism amount ‘

I’

component of a predetermined first journal parallelism amount at a predetermined first journal parallelism angle,

determining a total parallelism ‘

I’

component for each rotor disk including

determining an ‘

I’

component for the rotor disk at a selected rotor disk build angle of a predetermined rotor disk parallelism amount relative to a predetermined rotor disk parallelism angle, and

adding the total parallelism ‘

I’

component from the rotating part stacked prior and adjacent to the rotor disk to the ‘

I’

component for the rotor disk at the selected build angle,

determining a total parallelism ‘

I’

component for the second journal including

determining an ‘

I’

component for the second journal at a selected second journal build angle of a predetermined second journal parallelism amount relative to a predetermined second journal parallelism angle, and

adding the total parallelism ‘

I’

component from the final rotor disk,

determining a total parallelism ‘

I’

component for the first journal, the total parallelism ‘

I’

component for the first journal being a parallelism amount ‘

J’

component of the predetermined first journal parallelism amount at the predetermined first journal parallelism angle,

determining a total parallelism ‘

I’

component for each rotor disk including

determining a ‘

I’

component for the rotor disk at a selected rotor disk build angle of the predetermined rotor disk parallelism amount relative to a predetermined rotor disk parallelism angle, and

adding the total parallelism ‘

J’

component from the rotating part stacked prior and adjacent to the rotor disk to the ‘

J’

component for the rotor disk at the selected build angle,

determining a total parallelism ‘

J’

component for the second journal including

determining a ‘

J’

component for the second journal at a selected second journal build angle of the predetermined second journal parallelism amount relative to a predetermined second journal parallelism angle, and

adding the total parallelism ‘

J’

component from the final rotor disk.

3. The method of claim 1, wherein determining the minimum value for the total parallelism sum includes using a solver to minimize the total parallelism sum, the rotor disk build angles and the second journal build angle being changing inputs to the solver.

4. The method of claim 1, wherein the parallelism magnitude of each total parallelism vector is a polar magnitude determined by taking the square root of the sum of the total parallelism ‘

I’

component for the rotating part squared and the total parallelism ‘

J’

component for the rotating part squared.

5. The method of claim 1, wherein the rotor assembly is stacked using the selected rotor disk build angles and the second journal build angle.

6. The method of claim 5, wherein a predetermined tolerance of the rotor assembly is verified.

7. The method of claim 1, wherein a stacking system includes an optimization module which determines vector components for the total parallelism vector for each rotating part, determines the total parallelism sum, and determines the minimum value for the total parallelism sum.

8. A method for optimizing a rotor assembly for a gas turbine engine, the rotor assembly including rotating parts including a first journal, one or more rotor disks being stacked sequentially onto the first journal, and a second journal being stacked onto a final rotor disk of the one or more rotor disks, the method comprising:

determining vector components for a total concentricity vector for each rotating part, the total concentricity vector includes a concentricity magnitude and angle for a rotor stack of rotating parts up to and including the rotating part;

determining a true concentricity for each vector component relative to a center of rotation for the rotor assembly determined by positions of the first journal and the second;

determining a total concentricity sum including

determining a magnitude of each true concentricity vector, and

adding the magnitudes into a single sum; and

determining a minimum value for the total concentricity sum including selecting the rotor disk build angles and the second journal build angle that result in the smallest value for the total concentricity sum.

9. The method of claim 8, wherein determining vector components for the total concentricity vector for each rotating part includes

determining a total concentricity ‘

I’

component for the first journal, the total concentricity ‘

I’

component for the first journal being a concentricity amount ‘

I’

component of a predetermined first journal concentricity amount at a predetermined first journal concentricity angle,

determining a total concentricity ‘

I’

component for each rotor disk including

determining an ‘

I’

component for the rotor disk at a selected rotor disk build angle of a predetermined rotor disk concentricity amount relative to a predetermined rotor disk concentricity angle,

adding the total concentricity ‘

I’

component from the rotating part stacked prior and adjacent to the rotor disk to the ‘

I’

component for the rotor disk at the selected build angle, and

subtracting an ‘

I’

component of a concentricity error for the rotor disk caused by a total parallelism error of the rotating parts stacked prior to the rotor disk,

determining a total concentricity ‘

I’

component for the second journal including

determining an ‘

I’

component for the second journal at a selected second journal build angle of a predetermined second journal concentricity amount relative to a predetermined second journal concentricity angle, and

adding the total concentricity ‘

I’

component from the final rotor disk, and

subtracting an ‘

I’

component of a concentricity error for the second journal caused by a total parallelism error of the rotating parts stacked up to the final rotor disk,

determining a total concentricity ‘

J’

component for each rotor disk including

determining a concentricity ‘

J’

component for the rotor disk at a selected rotor disk build angle of a predetermined rotor disk concentricity amount relative to a predetermined rotor disk concentricity angle,

adding the total concentricity ‘

J’

component from the rotating part stacked prior and adjacent to the rotor disk to the concentricity ‘

J’

component for the rotor disk at the selected build angle, and

subtracting a ‘

J’

component of a concentricity error for the rotor disk caused by a total parallelism error of the rotating parts stacked prior to the rotor disk,

determining a total concentricity ‘

J’

component for the second journal including

determining a concentricity ‘

J’

component for the second journal at a selected second journal build angle of a predetermined second journal concentricity amount relative to a predetermined second journal concentricity angle, and

adding the total concentricity ‘

J’

component from the final rotor disk, and

subtracting a ‘

J’

component of a concentricity error for the second journal caused by a total parallelism error of the rotating parts stacked up to the final rotor disk; and

wherein determining the true concentricity for each vector component relative to the center of rotation for the rotor assembly determined by positions of the first journal and the second journal includes

adding to each concentricity ‘

I’

component for each rotor disk the product of the total concentricity ‘

I’

component of the second journal multiplied by a ratio of a stack length up to the current rotating part divided by an overall stack length, and

adding to each concentricity ‘

J’

component for each rotor disk the product of the total concentricity ‘

J’

component of the second journal multiplied by a ratio of a stack length up to the current rotating part divided by an overall stack.

10. The method of claim 8, wherein determining the minimum value for the total concentricity sum includes using a solver to minimize the total concentricity sum, the rotor disk build angles and the second journal build angle being changing inputs to the solver.

11. The method of claim 8, wherein the magnitude of each true concentricity vector is a polar magnitude determined by taking the square root of the sum of the true concentricity ‘

I’

component for the rotating part squared and the true concentricity ‘

J’

component for the rotating part squared.

12. The method of claim 8, wherein the rotor assembly is stacked using the selected rotor disk build angles and the second journal build angle.

13. The method of claim 8, wherein a stacking system includes an optimization module which determines vector components for the total concentricity vector for each rotating part, determines the total concentricity sum, and determines the minimum value for the total concentricity sum.

14. A method for optimizing a rotor assembly for a gas turbine engine, the rotor assembly including rotating parts including a first journal, one or more rotor disks being stacked sequentially onto the first journal, and a second journal being stacked onto a final rotor disk of the one or more rotor disks, the method comprising:

determining vector components for a total parallelism vector for each rotating part, the total parallelism vector includes a parallelism magnitude and angle for a rotor stack of rotating parts up to and including the rotating part;

determining a total parallelism sum including

determining a parallelism magnitude of each total parallelism vector, and

adding the parallelism magnitudes into a single sum;

determining vector components for a total concentricity vector, the total concentricity vector includes a concentricity magnitude and angle for a rotor stack of rotating parts up to and including the rotating part;

determining a true concentricity for each vector component relative to a center of rotation for the rotor assembly determined by positions of the first journal and the second journal;

determining a total concentricity sum including

determining a concentricity magnitude of each true concentricity vector, and

adding the concentricity magnitudes into a single sum;

determining a total combined sum including adding the total parallelism sum and the total concentricity sum into a single sum; and

determining a minimum value for the total combined sum including

selecting the rotor disk build angles and the second journal build angle that result in the smallest value for the total combined sum.

15. The method of claim 14, wherein determining vector components for the total parallelism vector for each rotating part includes

determining a total parallelism ‘

I’

component for the first journal, the total parallelism ‘

I’

component for the first journal being a parallelism amount ‘

I’

component of a predetermined first journal parallelism amount at a predetermined first journal parallelism angle,

determining a total parallelism ‘

I’

component for each rotor disk including

determining a parallelism ‘

I’

component for the rotor disk at a selected rotor disk build angle of a predetermined rotor disk parallelism amount relative to a predetermined rotor disk parallelism angle, and

adding the total parallelism ‘

I’

component from the rotating part stacked prior and adjacent to the rotor disk to the parallelism ‘

I’

component for the rotor disk at the selected build angle,

determining a total parallelism ‘

I’

component for the second journal including

determining a parallelism ‘

I’

component for the second journal at a selected second journal build angle of a predetermined second journal parallelism amount relative to a predetermined second journal parallelism angle, and

adding the total parallelism ‘

I’

component from the final rotor disk,

determining a total parallelism ‘

J’

component for the first journal, the total parallelism ‘

J’

component for the first journal being a parallelism amount ‘

J’

component of the predetermined first journal parallelism amount at the predetermined first journal parallelism angle,

determining a total parallelism ‘

J’

component for each rotor disk including

determining a parallelism ‘

J’

component for the rotor disk at a selected rotor disk build angle of the predetermined rotor disk parallelism amount relative to the predetermined rotor disk parallelism angle, and

adding the total parallelism ‘

J’

component from the rotating part stacked prior and adjacent to the rotor disk to the parallelism ‘

J’

component for the rotor disk at the selected build angle,

determining a total parallelism ‘

J’

component for the second journal including

determining a parallelism ‘

J’

component for the second journal at a selected second journal build angle of the predetermined second journal parallelism amount relative to the predetermined second journal parallelism angle, and

adding the total parallelism ‘

J’

component from the final rotor disk;

wherein determining vector components for the total concentricity vector for each rotating part includes

determining a total concentricity ‘

I’

component for the first journal, the total concentricity ‘

I’

component for the first journal being a concentricity amount ‘

I’

component of a predetermined first journal concentricity amount at a predetermined first journal concentricity angle,

determining a total concentricity ‘

I’

component for each rotor disk including

determining an ‘

I’

component for the rotor disk at a selected rotor disk build angle of a predetermined rotor disk concentricity amount relative to a predetermined rotor disk concentricity angle,

adding the total concentricity ‘

I’

component from the rotating part stacked prior and adjacent to the rotor disk to the ‘

I’

component for the rotor disk at the selected build angle, and

subtracting an ‘

I’

component of a concentricity error for the rotor disk caused by a total parallelism error of the rotating parts stacked prior to the rotor disk,

determining a total concentricity ‘

I’

component for the second journal including

determining an ‘

I’

component for the second journal at a selected second journal build angle of a predetermined second journal concentricity amount relative to a predetermined second journal concentricity angle, and

adding the total concentricity ‘

I’

component from the final rotor disk, and

subtracting an ‘

I’

component of a concentricity error for the second journal caused by a total parallelism error of the rotating parts stacked up to the final rotor disk,

determining a total concentricity ‘

J’

component for each rotor disk including

determining a concentricity ‘

J’

component for the rotor disk at a selected rotor disk build angle of a predetermined rotor disk concentricity amount relative to a predetermined rotor disk concentricity angle,

adding the total concentricity ‘

J’

component from the rotating part stacked prior and adjacent to the rotor disk to the concentricity ‘

J’

component for the rotor disk at the selected build angle, and

subtracting a ‘

J’

component of a concentricity error for the rotor disk caused by a total parallelism error of the rotating parts stacked prior to the rotor disk,

determining a total concentricity ‘

J’

component for the second journal including

determining a concentricity ‘

J’

component for the second journal at a selected second journal build angle of a predetermined second journal concentricity amount relative to a predetermined second journal concentricity angle, and

adding the total concentricity ‘

J’

component from the final rotor disk, and

subtracting a ‘

J’

component of a concentricity error for the second journal caused by a total parallelism error of the rotating parts stacked up to the final rotor disk; and

wherein determining the true concentricity for each vector component relative to the center of rotation for the rotor assembly determined by positions of the first journal and the second journal includes

adding to each concentricity ‘

I’

component for each rotor disk the product of the total concentricity ‘

I’

component of the second journal multiplied by a ratio of a stack length up to the current rotating part divided by an overall stack length, and

adding to each concentricity ‘

J’

component for each rotor disk the product of the total concentricity ‘

J’

component of the second journal multiplied by a ratio of a stack length up to the current rotating part divided by an overall stack.

16. The method of claim 14, wherein determining a minimum value for the total combined sum includes using a solver to minimize the total combined sum, the rotor disk build angles and the second journal build angle being changing inputs to the solver.

17. The method of claim 14, wherein the parallelism magnitude of each total parallelism vector is a polar magnitude determined by taking the square root of the sum of the total parallelism ‘

I’

component for the rotating part squared and the total parallelism ‘

J’

component for the rotating part squared and the concentricity magnitude of each true concentricity vector is also a polar magnitude determined by taking the square root of the sum of the true concentricity ‘

I’

component for the rotating part squared and the true concentricity ‘

J’

component for the rotating part squared.

18. The method of claim 14, wherein the rotor assembly is stacked using the selected rotor disk build angles and the second journal build angle.

19. The method of claim 18, wherein a predetermined tolerance of the rotor assembly is verified.

20. The method of claim 14, wherein a stacking system including an optimization module determines the total parallelism sum, the total concentricity sum, the total combined sum, and the minimum value for the total combined sum.