Real time gear box health management system and method of using the same

• US 7,318,007 B2
• Filed: 12/31/2003
• Issued: 01/08/2008
• Est. Priority Date: 12/31/2003
• Status: Expired due to Term

• Current Assignee: Rtx Corporation
• Original Assignee: United Technologies Corporation (Rtx Corporation)
• Inventors: Barkhoudarian, Sarkis
• Primary Examiner(s): Barlow; John
• Assistant Examiner(s): BHAT, ADITYA S
• Application Number:
  US10/750,512
• Publication Number:
  US 20050149290A1
• Time in Patent Office: 1,469 Days
• Field of Search: 702/32, 702/34, 702183-184, 700/99, 700/175, 700/176, 701/45, 703/7
• US Class Current: 702/184
• CPC Class Codes: F16H 2061/1272 the failing part is a part of the final output mechanism, e.g. shift rods or forks
• CPC Class Codes: F16H 61/12 Detecting malfunction or potential malfunction, e.g. fail safe in control of hydrostatic gearing F16H61/4192; Circumventing or fixing failures
• CPC Class Codes: G01H 1/003 of rotating machines G01H1/10 takes precedence
• CPC Class Codes: G01H 13/00 Measuring resonant frequency

Abstract

A system is provided for monitoring rotating machinery having a shaft and circumferentially disposed extensions rotatable with the shaft and spaced apart from one another. The system includes a plurality of proximeters positioned proximate to the rotating machinery and operable to measure and transmit resonant vibration frequency and amplitude data derived from a transit time between the individual rotating extensions, along with signal amplitude data, and a processor electrically coupled to receive the data and configured to correlate the data and thereby produce an assessment of operational health for the machinery. A method is also provided for monitoring rotating machinery, using the system of the invention.

Claims

1. A system for monitoring rotating machinery having a shaft and circumferentially disposed extensions rotatable with said shaft and spaced apart from one another, the system comprising:

a plurality of proximeters positioned proximate to said rotating machinery and each proximeter being operable to measure and transmit resonant vibration frequency and bending amplitude data for said rotating machinery derived from a transit time between said individual rotating extensions, along with distance data derived from signal amplitude data for a proximeter signal strength of the bending, wherein said plurality of proximeters are positioned so as to enable mapping a resonance period of said rotating machinery; and

a processor electrically coupled to receive said data and configured to correlate said data and thereby produce an assessment of operational health for said machinery.

2. A system according to claim 1, wherein said processor assessment includes a remaining operational life prediction for said machinery.

3. A system according to claim 1, wherein said processor assessment includes a maintenance schedule for said machinery.

4. A system according to claim 1, wherein said distance data includes radial runout data for said shaft.

5. A system according to claim 4, wherein said rotating machinery comprises a gearbox comprising a gear having multiple teeth, and said radial runout data indicates radial positions of said teeth.

6. A system according to claim 1, wherein said rotating machinery includes a rotating shaft, and said processor correlates said resonant vibration data and radial runout data for said shaft.

7. A system according to claim 6, wherein said proximeters further measure and transmit axial movement data for said shaft.

8. A system according to claim 7, wherein said rotating machinery comprises a gearbox comprising a gear having multiple teeth, and said proximeters further measure and transmit axial movement data.

9. A system according to claim 1, wherein said processor correlates said resonant vibration data and axial movement data for said shaft.

10. A system according to claim 1, wherein said proximeters are electromagnetic proximeters.

11. A system according to claim 1, wherein said proximeters are capacitive proximeters.

12. A system according to claim 1, wherein said proximeters are optical proximeters.

13. A system according to claim 1, further comprising:

multiple rotating machinery components having a shaft and circumferentially disposed extensions rotatable with said shaft and spaced apart from one another; and

additional proximeters, positioned circumferentially apart from one another and proximate to different respective components, and operable to measure and transmit nonduplicative resonant vibration and bending amplitude data for each of said rotating extensions along with distance data derived from signal strength of the bending amplitude data for said multiple rotating machinery components.

14. A system according to claim 1, wherein said rotating machinery comprises a gearbox comprising a gear having multiple teeth.

15. A system according to claim 1, wherein a first and a second of said plurality of proximeters are orientated at about 90°

to each other.

16. A system according to claim 15, wherein said gearbox comprises at least two gears that mesh at a meshing point, and at least one of said proximeters is disposed at a location approximately 180°

from said meshing point.

17. A system according to claim 1, further comprising:

a housing having an interior space in which said rotating machinery is disposed, and a wall defining at least a portion of said interior space and separating said proximeters from said rotating machinery.

18. A system according to claim 17, wherein at least one of said proximeters is an electromagnetic proximeter, and said wall has a blind hole extending partially through said wall in which one of said electromagnetic proximeter is disposed.

19. A system according to claim 1, wherein at least one of said proximeters is exposed to said rotating machinery.

20. A system according to claim 1, wherein said processor compares said measurements with predetermined values to assess said rotating machinery operational health.

21. A system according to claim 20, wherein said predetermined values include previously accumulated resonance data, including established maximum values for acceptable machinery fatigue levels.

22. A system according to claim 21, wherein said resonance data comprises vibration frequency data.

23. A system according to claim 21, wherein said resonance data comprises circumferential vibration amplitude data.

24. A system according to claim 21, wherein said predetermined values further comprise values for a radial gap between a gear tooth and a housing in which said gear tooth is housed.

25. A system according to claim 1, further comprising:

an alerting signal generator that produces a signal reporting said rotating machinery operational health.

26. A system according to claim 25, wherein said alerting signal comprises instructions for maintaining said rotating machinery.

27. A system according to claim 25, wherein said alerting signal comprises a textual, audio, or video signal.

28. A system according to claim 25, wherein said alerting signal automatically halts action of said rotating machinery.

29. A system according to claim 1, wherein said processor is configured to detect rotating machinery chatter.

30. A system according to claim 29, wherein said processor is configured to detect a frequency and amplitude of said machinery chatter.

31. A system according to claim 30, wherein said processor is configured to assess lubricity degradation for said rotating machinery based on said machinery chatter.

32. A system according to claim 1, wherein said rotating machinery comprises a gearbox comprising a gear having multiple teeth, and said proximeters are spaced at odd harmonics of the resonance frequency quarter wavelength of said teeth.

33. A method for monitoring rotating machinery having a shaft and circumferentially disposed extensions rotatable with said shaft and spaced apart from one another, the method comprising the steps of:

positioning a plurality of proximeters proximate to said rotating machinery, each of said proximeters being operable to measure and transmit resonant vibration and bending amplitude data for said rotating machinery derived from a transit time between said individual rotating extensions, along with distance data derived from signal strength of the bending amplitude data for a proximeter signal;

receiving and correlating said data using a processor that is electrically coupled to said plurality of proximeters to map a resonance period of said rotating machinery;

producing an assessment of operational health for said machinery based on said measurements using said processor; and

outputting the assessment of operational heath.

34. A method according to claim 33, wherein said assessment includes a remaining operational life prediction for said machinery.

35. A method according to claim 33, wherein said processor assessment includes a maintenance schedule for said machinery.

36. A method according to claim 33, wherein said rotating machinery includes a rotating shaft, and said distance data includes radial runout data for said shaft.

37. A method according to claim 36, wherein said rotating machinery comprises a gearbox comprising a gear having multiple teeth, and said radial runout data indicates radial positions of said teeth.

38. A method according to claim 33, wherein said processor correlates said distance data and thereby produces radial runout data for said shaft.

39. A method according to claim 33, wherein said rotating machinery includes a rotating shaft, and said resonant vibration data includes axial movement data for said shaft.

40. A method according to claim 39, wherein said rotating machinery comprises a gearbox comprising a gear having multiple teeth, and said axial movement data indicates radial positions of said teeth.

41. A method according to claim 33, wherein said processor correlates said resonant vibration data and thereby produces axial movement data for said shaft.

42. A method according to claim 33, wherein said proximeters are electromagnetic proximeters.

43. A method according to claim 33, wherein said proximeters are capacitive proximeters.

44. A method according to claim 33, wherein said proximeters are optical proximeters.

45. A method according to claim 33, wherein said proximeters are fiber optical proximeters.

46. A method according to claim 33, wherein said positioning step further comprises circumferentially positioning additional proximeters apart from one another and proximate to different respective rotating machinery components having a shaft and circumiferentially disposed extensions rotatable with said shaft and spaced apart from one another, said additional proximeters being operable to measure and transmit nonduplicative resonant vibration frequency and bending amplitude data for each of said rotating extensions of said multiple components.

47. A method according to claim 33, wherein said rotating machinery is a gearbox comprising a gear having multiple teeth.

48. A method according to claim 47, wherein said assessing step comprises assessing operational health of each of said teeth.

49. A method according to claim 47, wherein said gearbox comprises at least two gears that mesh at a meshing point, and said positioning step comprises positioning at least one of said proximeters at a location approximately 180 degree from said meshing point.

50. A method according to claim 33, wherein said positioning step comprises attaching said proximeter to a housing having an interior space in which said rotating machinery is disposed, and a wall defining at least a portion of said interior space and separating said proximeter from said rotating machinery.

51. A method according to claim 50, wherein at least one of said proximeters is an electromagnetic proximeter, and said positioning step comprises positioning said proximeter in a blind hole that is formed in and extends partially through said wall.

52. A method according to claim 33, wherein said positioning step comprises exposing at least one of said proximeters to said rotating machinery.

53. A method according to claim 33, wherein said assessing step comprises comparing said measurements with predetermined values to assess said rotating machinery operational health.

54. A method according to claim 53, wherein said predetermined values include previously accumulated resonance data, including established maximum values for acceptable machinery fatigue levels.

55. A method according to claim 54, wherein said resonance data comprises vibration frequency data.

56. A method according to claim 54, wherein said resonance data comprises circumferential vibration amplitude data.

57. A method according to claim 54, wherein said predetermined values further comprise values for a radial gap between a gear tooth and a housing in which said gear tooth is housed.

58. A method according to claim 33, further comprising the step of:

generating an alerting signal that reports said rotating machinery operational health.

59. A method according to claim 58, wherein said alerting signal comprises instructions for maintaining said rotating machinery.

60. A method according to claim 58, wherein said alerting signal comprises a textual, audio, or video signal.

61. A method according to claim 58, wherein said alerting signal automatically halts action of said rotating machinery when said rotating machinery operational health is poor.

62. A method according to claim 33, further comprising detecting chatter from said rotating machinery using said processor.

63. A method according to claim 62, further comprising determining a frequency and amplitude of said machinery chatter using said processor.

64. A method according to claim 63, wherein said processor assessment comprises a lubricity degradation assessment for said rotating machinery based on said machinery chatter data.

65. A method according to claim 33, wherein said rotating machinery comprises a gearbox comprising a gear having multiple teeth, and said proximeters are spaced at odd harmonics of the resonance frequency quarter wavelength of said teeth.

66. A system for monitoring rotating machinery having a shaft and circumferentially disposed extensions rotatable with said shaft and spaced apart from one another, the system comprising:

a plurality of proximeters positioned proximate to said rotating machinery and each proximeter being operable to measure and transmit resonant vibration frequency and bending amplitude data derived from a transit time between said individual rotating extensions, along with distance data derived from signal strength of the bending amplitude data, wherein said proximeters are selected from the group consisting of electromagnetic proximeters, and capacitive proximeters; and

a processor electrically coupled to receive said data and configured to correlate said data and thereby produce an assessment of operational health for said machinery.