Sensor for monitoring rotors

1. An apparatus comprising:

a rotating shaft coupled to a set of rotor blades;

a non-rotating tube at least partially disposed within the rotating shaft and coupled to the rotating shaft, wherein the non-rotating tube comprises a first end and a second end;

a sensor mount disposed within the non-rotating tube proximate to the second end of the non-rotating tube; and

one or more sensors attached to the sensor mount, wherein the one or more sensors detect one or more parameters associated with the rotating shaft or the set of rotor blades.

2. The apparatus of claim 1 , wherein:

the one or more parameters comprise a vibration, a rotational speed, an acceleration, a temperature or a combination thereof; and

the one or more sensors comprise a tachometer, a single axis accelerometer, a multiple axis accelerometer, a temperature sensor or a combination thereof.

3. The apparatus of claim 1 , further comprising a Health and Usage Monitoring System (HUMS) communicably coupled to the one or more sensors.

4. The apparatus of claim 1 , further comprising one or more wires or cables, or a wireless transceiver at least partially disposed within the non-rotating tube and coupled to the one or more sensors.

5. The apparatus of claim 1 , further comprising an external sensor attached to the sensor mount and positioned beyond the second end of the non-rotating tube.

6. The apparatus of claim 1 , wherein:

the sensor mount is cup-shaped and seals the second end of the non-rotating tube; and

the sensor mount is attached to the non-rotating tube via an adhesive.

7. The apparatus of claim 1 , wherein the sensor mount includes a flange that mates with the second end of the non-rotating tube and controls a position of the sensor mount along a longitudinal axis of the non-rotating tube.

8. The apparatus of claim 1 , further comprising a retention device affixing the sensor mount to the non-rotating tube, wherein the retention device comprises one or more cotter pins, a safety wire or a combination thereof.

9. The apparatus of claim 1 , further comprising a set of bearings coupling the non-rotating tube to the rotating shaft.

10. The apparatus of claim 1 , further comprising:

a rotating standpipe disposed between the rotating shaft and the non-rotating tube such that the non-rotating tube is coupled to the rotating standpipe and the rotating standpipe is coupled to the rotating shaft; and

a control actuator coupled proximate to the first end of the non-rotating tube, wherein the control actuator selectively moves the non-rotating tube along a longitudinal axis.

11. The apparatus of claim 10 , wherein the one or more sensors further detect a stickage and/or a slippage of the non-rotating tube.

12. The apparatus of claim 10 , further comprising:

a clamp assembly attached to an exterior of the non-rotating tube proximate to the second end of the non-rotating tube;

a set of bearings coupling the clamp assembly to the rotating standpipe;

a crosshead attached to an exterior of the rotating standpipe proximate to the set of bearings;

a set of pitch link coupling the set of rotor blades to the crosshead; and

wherein the rotating standpipe is splined to the rotating shaft.

13. The apparatus of claim 12 , wherein:

at least one of the one or more sensors comprises an accelerometer; and

the sensor mount and the accelerometer are positioned to create a vibration path between the set of bearings and the accelerometer.

14. A method comprising:

providing a rotating shaft coupled to a set of rotor blades, a non-rotating tube at least partially disposed within the rotating shaft and coupled to the rotating shaft, wherein the non-rotating tube comprises a first end and a second end, a sensor mount disposed within the non-rotating tube proximate to the second end of the non-rotating tube, and one or more sensors attached to the sensor mount; and

detecting one or more parameters associated with the rotating shaft or the set of rotor blades rotor using the one or more sensors.

15. The method of claim 14 , wherein:

the one or more parameters comprise a vibration, a rotational speed, an acceleration, a temperature or a combination thereof; and

the one or more sensors comprise a tachometer, a single axis accelerometer, a multiple axis accelerometer, a temperature sensor or a combination thereof.

16. The method of claim 14 , wherein:

providing the one or more sensors comprises attaching the one or more sensors to the sensor mount; and

providing the sensor mount comprises installing the sensor mount within the non-rotating tube proximate to the second end of the non-rotating tube.

17. The method of claim 14 , further comprising providing a set of bearings coupling the non-rotating tube to the rotating shaft.

18. The method of claim 14 , further comprising positioning an external sensor beyond the second end of the non-rotating tube and attaching the external sensor to the sensor mount.

19. The method of claim 14 , further comprising providing one or more wires or cables, or a wireless transceiver at least partially disposed within the non-rotating tube and coupled to the one or more sensors.

20. The method of claim 14 , wherein:

the sensor mount is cup-shaped and seals the second end of the non-rotating tube; and

the sensor mount is attached to the non-rotating tube via an adhesive.

21. The method of claim 14 , further comprising affixing the sensor mount to the non-rotating tube using a retention device, wherein the retention device comprises one or more cotter pins, a safety wire or a combination thereof.

22. The method of claim 14 , further comprising:

providing a rotating standpipe between the rotating shaft and the non-rotating tube such that the non-rotating tube is coupled to the rotating standpipe and the rotating standpipe is coupled to the rotating shaft;

providing a control actuator coupled proximate to the first end of the non-rotating tube; and

selectively moving the non-rotating tube along a longitudinal axis using the control actuator.

23. The method of claim 22 , further comprising detecting a stickage and/or a slippage of the non-rotating tube using the one or more sensors.

24. The method of claim 22 , further comprising:

providing a clamp assembly attached to an exterior of the non-rotating tube proximate to the second end of the non-rotating tube;

providing a set of bearings coupling the clamp assembly to the rotating standpipe;

providing a crosshead attached to an exterior of the rotating standpipe proximate to the set of bearings;

providing a set of pitch link coupling the set of rotor blades to the crosshead; and

wherein the rotating standpipe is splined to the rotating shaft.

25. The method of claim 24 , wherein:

at least one of the one or more sensors comprises an accelerometer; and

the retention device and the accelerometer are positioned to create a vibration path between the set of bearings and the accelerometer.

26. A rotor assembly comprising:

a gearbox;

a set of rotor blades;

a rotating shaft having a first end operably coupled to the gearbox and a second end operably coupled to the set of rotor blades;

a rotating standpipe disposed at least partially within the rotating shaft and coupled to the rotating shaft;

a non-rotating tube at least partially disposed within the rotating standpipe and coupled to the rotating standpipe, wherein the non-rotating tube comprises a first end extending through the gearbox, a second end extending beyond the second end of the rotating shaft, and a longitudinal axis;

a sensor mount disposed within the non-rotating tube proximate to the second end of the non-rotating tube;

one or more sensors attached to the sensor mount, wherein the one or more sensors detect one or more parameters associated with the rotating shaft, the rotating standpipe or the set of rotor blades;

one or more wires or cables at least partially disposed within the non-rotating tube, wherein the one or more wires or cables comprise a first end extending through the first end of the non-rotating tube and a second end coupled to the one or more sensors;

a clamp assembly attached to an exterior of the non-rotating tube proximate to the second end of the non-rotating tube;

a set of bearings coupling the clamp assembly to the rotating standpipe;

a crosshead attached to an exterior of the rotating standpipe proximate to the set of bearings;

a set of pitch links coupling the set of rotor blades to the crosshead; and

a control actuator coupled to the first end of the non-rotating tube, wherein the control actuator adjusts a pitch of the set of rotor blades by selectively moving the non-rotating tube along the longitudinal axis.