Vibration control assembly for an aircraft and method of controlling aircraft vibration

1. A vibration control assembly for a vibration producing structure comprising:

a housing operatively connectable to the vibration producing structure;

a cage disposed within an interior region of the housing, the cage rotatable within the housing about a first axis;

a gyroscope wheel disposed within the cage and rotatable about a second axis that is substantially perpendicular relative to the first axis, wherein the gyroscope wheel is operable to impose a controllable moment on the vibration producing structure to counter vibratory moments produced by the vibration producing structure;

a planetary gear arrangement configured to transmit power to the gyroscope wheel to rotate the gyroscope wheel about the second axis; and

a motor shaft extending along the first axis and penetrating the housing, the motor shaft supporting a sun gear operatively connected to the planetary gear arrangement.

2. The vibration control assembly of claim 1 , wherein the planetary gear arrangement transmits power to the gyroscope wheel directly from an electric motor shaft of an electric motor.

3. The vibration control assembly of claim 1 , wherein the planetary gear arrangement transmits power to the gyroscope wheel directly from a hydraulic motor shaft of a hydraulic motor.

4. The vibration control assembly of claim 1 , wherein the planetary gear arrangement is coupled to an aircraft gearbox with a gearbox shaft.

5. The vibration control assembly of claim 1 , further comprising a motor operatively coupled to the cage with the motor shaft to rotate the cage and to control precession of the vibration control assembly, the motor shaft rotatable about a motor axis, wherein the sun gear of the planetary gear arrangement rotates about a sun gear axis that coincides with the motor axis.

6. The vibration control assembly of claim 1 , further comprising a motor operatively coupled to the cage to rotate the cage and to control precession of the vibration control assembly.

7. The vibration control assembly of claim 6 , wherein the motor is operatively coupled to the gyroscope wheel and drives rotation of the gyroscope wheel.

8. The vibration control assembly of claim 6 , further comprising a slip ring disposed between the motor and the cage.

9. The vibration control assembly of claim 1 , wherein the gyroscope wheel is rotated at a constant speed.

10. The vibration control assembly of claim 1 , wherein rotation of the cage about the first axis and rotation of the gyroscopic wheel about the second axis selectively adjusts the controllable moment.

11. The vibration control assembly of claim 1 , wherein the planetary gear arrangement includes a planet gear shaft extending substantially parallel to the first axis, the planet gear shaft including at least one planet gear operable to rotate the gyroscopic wheel about the second axis.

12. The vibration control assembly according of claim 1 , wherein the gyroscopic wheel includes a gyroscopic shaft extending along the second axis and a wheel segment extending along the first axis, the wheel segment being disposed to rotate about the second axis.

13. The vibration control assembly of claim 12 , wherein the gyroscopic shaft supports first and second gyroscopic bearings, wherein rotation of the gyroscopic wheel produces a moment that is passed through the first and second gyroscopic bearings into the cage.

14. The vibration control assembly of claim 1 , wherein the planetary gear arrangement includes a first planet gear shaft and a second planet gear shaft, and wherein each of the first and second planet gear shafts are coupled to the sun gear.

15. The vibration control assembly of claim 1 , wherein electric motor permanent magnets are disposed along an outer perimeter of a wheel portion of the gyroscope wheel and at an inner portion of a motor stator, and wherein the magnets are configured to drive rotation of the gyroscope wheel.