High speed rotor dynamics centralizer

1. A centralizer for use in high speed rotor dynamics applications, the centralizer comprising:

a cylindrical housing having a first end portion and a second end portion;

a rotatable shaft positioned within a cavity of the cylindrical housing;

flexure springs that are each attached to and extend between the first end portion and the second end portion, wherein the flexure springs are compressible toward a middle portion of the cylindrical housing that is between the first end portion and the second end portion, wherein each of the flexure springs comprises a wide section positioned between a first narrow section and a second narrow section, wherein the wide section is thicker than the first narrow section and the second narrow section, and wherein the wide section has slots that traverse therethrough; and

roller wheels attached to the flexure springs, wherein the roller wheels are configured to extend through the slots in the wide section of the flexure springs.

2. The centralizer of claim 1 , wherein the flexure springs are leaf springs designed to have a desired spring rate.

3. The centralizer of claim 1 , wherein two roller wheels of the roller wheels are attached to each flexure spring of the flexure springs.

4. The centralizer of claim 1 , wherein the roller wheels are spaced from the middle portion of the cylindrical housing when the flexure springs are not compressed.

5. The centralizer of claim 1 , wherein the roller wheels remain spaced from the cylindrical housing when the flexure springs are compressed toward the cylindrical housing with an amount of force.

6. The centralizer of claim 1 , wherein the flexure springs are mounted 120 degrees apart from each other around the cylindrical housing.

7. The centralizer of claim 1 , wherein each flexure spring of the flexure springs includes an elongated attachment hole at an end portion of the flexure spring and wherein an attachment pin extends through the elongated attachment hole attaching the flexure spring to the first end portion of the cylindrical housing.

8. The centralizer of claim 7 , wherein each flexure spring of the flexure springs includes a round attachment hole at a second end portion of the flexure spring and wherein a second attachment pin extends through the round attachment hole attaching the flexure spring to the second end portion of the cylindrical housing.

9. The centralizer of claim 1 , further comprising a first bearing at the first end portion and a second bearing at the second end portion, wherein a first end portion of the shaft extends through the first bearing and wherein a second end portion of the shaft extends through the second bearing.

10. The centralizer of claim 9 , wherein the first bearing and the second bearing support and transmit rotodynamic loads from the rotatable shaft through the cylindrical housing, the flexure springs, and the roller wheels.

11. The centralizer of claim 9 , wherein the first bearing and the second bearing are each a roller bearing or a thrust bearing.

12. The centralizer of claim 1 , further comprising:

a first coupler attached to the first end portion of the shaft for attaching a first rotatable rod to the shaft; and

a second coupler attached to the second end portion of the shaft for attaching a second rotatable rod to the shaft.

13. The centralizer of claim 1 , wherein the cavity of the cylindrical housing is hermetically sealed by seals at the first end portion and the second end portion and wherein the cavity contains a lubricant.

14. A system for use in high speed rotor dynamics applications, the system comprising:

a centralizer, comprising:

a cylindrical housing having a first end portion and a second end portion;

a rotatable shaft positioned within a cavity of the cylindrical housing;

flexure springs that are each attached to and extend between the first end portion and the second end portion, wherein the flexure springs are compressible toward a middle portion of the cylindrical housing that is between the first end portion and the second end portion; and

roller wheels attached to the flexure springs; and

a first rod attached to the centralizer; and

a second rod attached to the centralizer at an opposite side from the first rod.

15. The system of claim 14 , further comprising:

a first coupler attached to the first end portion of the shaft for attaching a first rotatable rod to the rotatable shaft; and

a second coupler attached to the second end portion of the shaft for attaching a second rotatable rod to the rotatable shaft.

16. The system of claim 14 , wherein the flexure springs are mounted 120 degrees apart from each other around the cylindrical housing.

17. The system of claim 14 , wherein the centralizer further comprises a first bearing at the first end portion and a second bearing at the second end portion, wherein a first end portion of the cylindrical housing extends through the first bearing and wherein a second end portion of the cylindrical housing extends through the second bearing.

18. The system of claim 17 , wherein the first bearing and the second bearing support and transmit rotodynamic loads from the rotatable shaft through the cylindrical housing, the flexure springs, and the roller wheels.

19. The system of claim 17 , wherein the first bearing and the second bearing are each a roller bearing or a thrust bearing.

20. A centralizer for use in high speed rotor dynamics applications, the centralizer comprising:

a cylindrical housing having a first end portion and a second end portion;

a rotatable shaft positioned within a cavity of the cylindrical housing;

flexure springs that are each attached to and extend between the first end portion and the second end portion, wherein the flexure springs are compressible toward a middle portion of the cylindrical housing that is between the first end portion and the second end portion;

roller wheels attached to the flexure springs;

a first coupler attached to the first end portion of the shaft for attaching a first rotatable rod to the shaft; and

a second coupler attached to the second end portion of the shaft for attaching a second rotatable rod to the shaft.