Bearing support assembly

1. A bearing support assembly configured to support one or more bearings on a shaft, the bearing support assembly comprising:

a bearing support frame configured to be coupled to a static frame;

a plurality of ribs connected to the bearing support frame; and

a bearing support connected to the plurality of ribs and configured to support a bearing of the one or more bearings,

wherein the bearing support assembly has a non-axisymmetric stiffness varying around a circumference of the bearing support assembly, and wherein the non-axisymmetric stiffness is achieved by altering a material of one or more of the plurality of ribs.

2. The bearing support assembly of claim 1 , wherein the bearing support assembly always has a non-axisymmetric stiffness around the circumference of the bearing support assembly.

3. The bearing support assembly of claim 1 , wherein the bearing support assembly has a non-axisymmetric stiffness above a threshold load level and a symmetric stiffness below the threshold load level.

4. The bearing support assembly of claim 1 , wherein the non-axisymmetric stiffness is a sinusoidal curve, a linear curve, a spline, or combinations thereof.

5. A bearing support assembly configured to support one or more bearings on a shaft, the bearing support assembly comprising:

a bearing support frame configured to be coupled to a static frame;

a plurality of ribs connected to the bearing support frame; and

a bearing support connected to the plurality of ribs and configured to support a bearing of the one or more bearings,

wherein the bearing support assembly has a non-axisymmetric stiffness varying around a circumference of the bearing support assembly, and

wherein the non-axisymmetric stiffness is achieved by altering an orientation of one or more of the plurality of ribs, wherein the plurality of ribs includes a plurality of fixed ribs and a plurality of movable ribs.

6. The bearing support assembly of claim 1 , wherein the plurality of ribs comprises a first subset of ribs and a second subset of ribs, and wherein a material of the first subset of ribs is different than a material of the second subset of ribs, and wherein the material of the first subset of ribs is a steel base with an aluminum deposit outer layer and the material of the second subset of ribs is a steel base with a titanium deposit outer layer.

7. The bearing support assembly of claim 1 , wherein the plurality of ribs comprises a hybrid rib arrangement, and wherein the hybrid rib arrangement comprises a combination of solid ribs, hollow ribs, hollow-filled ribs, or any combination thereof.

8. The bearing support assembly of claim 1 , wherein the non-axisymmetric stiffness is achieved by altering the bearing support, wherein the bearing support comprises a first bearing support separated by a gap from a second bearing support and the gap includes a first gap and a second gap, the first gap between a first distal end of the first bearing support and a first distal end of the second bearing support and the second gap between a second distal end of the first bearing support and a second distal end of the second bearing support, and wherein the bearing support is a split bearing support.

9. The bearing support assembly of claim 1 , further comprising a nonsymmetric gap between the bearing support and the bearing support frame; and a material in the nonsymmetric gap, wherein the material is a viscoelastic material, a rubber material, a shape memory alloy, or combinations thereof, and wherein a first stiffness at an X-axis location is greater than a second stiffness at a Y-axis location above a threshold load level, and the first stiffness is the same as the second stiffness below the threshold load level.

10. The bearing support assembly of claim 1 , further comprising a symmetric gap between the bearing support and the bearing support frame, wherein the symmetric gap is filled with a first material and a second material, the first material having a greater stiffness than that of the second material.

11. The bearing support assembly of claim 1 , further comprising a symmetric gap between the bearing support and the bearing support frame, wherein the symmetric gap is filled with a magnetorheological fluid.

12. The bearing support assembly of claim 1 , wherein the bearing support frame has a first spring finger adjacent a second spring finger on the bearing support; and a gap between the bearing support frame and the bearing support.

13. The bearing support assembly of claim 1 , wherein the non-axisymmetric stiffness is achieved by altering a cross section of the bearing support, and wherein the cross section is non-symmetric such that an outer diameter of the bearing support is ovular and an inner diameter of the bearing support is circular.

14. The bearing support assembly of claim 1 , further comprising a bearing supplemental support connected between the bearing support frame and the bearing support, wherein the bearing supplemental support comprises a plurality of members extending between the bearing support frame and the bearing support.

15. The bearing support assembly of claim 1 , wherein the non-axisymmetric stiffness is achieved by altering an orientation of one or more of the plurality of ribs, wherein the plurality of ribs includes a plurality of fixed ribs and a plurality of movable ribs.

16. The bearing support assembly of claim 5 , wherein one or more of the plurality of movable ribs is formed of layers of material within a base material.

17. The bearing support assembly of claim 5 , wherein the plurality of movable ribs is arranged vertically with respect to a Y-axis, horizontally with respect to an X-axis, or wherein a first subset of the plurality of movable ribs is arranged vertically with respect to a Y-axis and a second subset of the plurality of movable ribs is arranged horizontally with respect to an X-axis.

18. The bearing support assembly of claim 17 , wherein the first subset of the plurality of movable ribs is aligned with a twelve o'clock position and a six o'clock position and the second subset of the plurality of movable ribs is aligned with a three o'clock position and a nine o'clock position.

19. The bearing support assembly of claim 17 , wherein the first subset of the plurality of movable ribs is aligned with a three o'clock position and a nine o'clock position and the second subset of the plurality of movable ribs is aligned with a twelve o'clock position and a six o'clock position.

20. A compressor section of a gas turbine engine, the compressor section comprising:

(a) a shaft for driving a compressor;

(b) a static frame;

(c) a bearing; and

(d) a bearing support assembly coupled between the static frame and the shaft, the bearing support assembly comprising:

(i) a bearing support frame coupled to the static frame;

(ii) a plurality of ribs connected to the bearing support frame; and

(iii) a bearing support connected to the plurality of ribs and configured to support the bearing,

wherein the bearing support assembly has a non-axisymmetric stiffness around a circumference of the bearing support assembly, and wherein the non-axisymmetric stiffness is achieved by altering a material of one or more of the plurality of ribs.