Acoustic-Based Rotating Component Analysis

• US 20100161255A1
• Filed: 12/18/2009
• Published: 06/24/2010
• Est. Priority Date: 12/18/2008
• Status: Active Grant

• Current Assignee: International Electronic Machines Corp.
• Original Assignee: International Electronic Machines Corp.
• Inventors: Mian, Zahid F., Smith, Richard L.
• Granted Patent: US 8,326,582 B2
• Time in Patent Office: Days
• US Class Current: 702/56
• CPC Class Codes: G01N 2291/044 Internal reflections (echoes), e.g. on walls or defects
• CPC Class Codes: G01N 2291/101 one transducer
• CPC Class Codes: G01N 2291/2696 Wheels, Gears, Bearings
• CPC Class Codes: G01N 29/041 on the surface of the material, e.g. using Lamb, Rayleigh or shear waves
• CPC Class Codes: G01N 29/4463 Signal correction, e.g. distance amplitude correction [DAC], distance gain size [DGS], noise filtering

Abstract

An acoustic sensor acquires acoustic data corresponding to a rotating component of a machine during operation of the machine. The acoustic sensor can be configured to enhance acoustic signals in a range of frequencies corresponding to at least one evaluated condition of the rotating component and/or enhance the acoustic signals received from a directional area narrowly focused on the rotating component. The rotating component is evaluated using the acoustic data acquired by the acoustic sensor. In an embodiment, the machine can be a vehicle traveling past a parabolic microphone. In a more specific embodiment, the vehicle is a rail vehicle and the rotating component is a railroad wheel bearing.

Claims

1. A system comprising:

an acoustic sensor configured to acquire acoustic data corresponding to a rotating component of a machine during operation of the machine, wherein the acoustic sensor is configured to enhance acoustic signals in a range of frequencies corresponding to at least one evaluated condition of the rotating component and enhance the acoustic signals received from a directional area narrowly focused on the rotating component; and

a computer system including at least one computing device configured to evaluate the rotating component by;

obtaining the acoustic data corresponding to the rotating component;

determining whether any one of the at least one evaluated condition is present in the rotating component based on the acoustic data corresponding to the rotating component; and

storing a result of the determining.

2. The system of claim 1, wherein the determining includes extracting a set of features from the acoustic data corresponding to the rotating component and analyzing the set of features for at least one condition feature associated with the at least one evaluated condition.

3. The system of claim 2, wherein the evaluation further includes removing background noise from the acoustic data prior to the extracting using a noise model corresponding to a deployment location of the acoustic sensor.

4. The system of claim 2, wherein the extracting includes generating a set of statistics based on at least one of:

acoustic data corresponding to the range of frequencies or a plurality of sub-bands of the range of frequencies.

5. The system of claim 2, wherein the set of features are determined using an exemplar acoustic sensor different from the acoustic sensor, and wherein the evaluation further includes adjusting the acoustic data using a correction function corresponding to a difference between a response parameter of the acoustic sensor and a response parameter of the exemplar acoustic sensor over the range of frequencies prior to the extracting.

6. The system of claim 1, wherein the acoustic sensor comprises a parabolic microphone having a main directional area within which the rotating component is located.

7. The system of claim 6, wherein the main directional area is configured such that the rotating component is the only sound source within the main directional area during a time period that the acoustic data corresponding to the rotating component is acquired.

8. The system of claim 1, further comprising at least one attribute sensing device configured to acquire attribute data corresponding to at least one of the rotating component or the machine, wherein the evaluation further includes associating the attribute data corresponding to the rotating component with the result of the determining.

9. The system of claim 1, further comprising at least one ambient sensing device configured to acquire ambient data corresponding to an environment in which the at least one acoustic sensor is operating, wherein the evaluation further includes adjusting at least one aspect of the determining based on the ambient data.

10. The system of claim 9, wherein the ambient data comprises at least one of a temperature, a wind direction, or a wind speed of the environment.

11. A system comprising:

an acoustic sensor configured to acquire acoustic data received from a fixed narrowly focused directional area, wherein the directional area includes a target area through which a rotating component of a vehicle moves during operation of the vehicle; and

a computer system including at least one computing device configured to evaluate the rotating component by;

obtaining acoustic data corresponding to the rotating component as the rotating component moved through the target area;

determining whether any one of at least one evaluated condition is present in the rotating component based on the acoustic data corresponding to the rotating component, the determining including;

extracting a set of features from the acoustic data corresponding to the rotating component and analyzing the set of features for at least one condition feature associated with the at least one evaluated condition.

12. The system of claim 11, wherein the acoustic sensor is configured such that the target area includes only a single rotating component on the vehicle during a time period that the acoustic data corresponding to the rotating component is acquired.

13. The system of claim 11, further comprising a second acoustic sensor configured to acquire acoustic data received from a second fixed narrowly focused directional area, wherein the directional area and the second directional area converge at the target area, and wherein the obtaining includes obtaining the acoustic data corresponding to the rotating component acquired by both the acoustic sensor and the second acoustic sensor.

14. The system of claim 11, further comprising a electronic reader configured to acquire electronic identification data corresponding to the vehicle, and wherein the at least one computing device is further configured to associate the electronic identification data with a result of the evaluation.

15. A system comprising:

an acoustic sensor configured to acquire acoustic data received from a fixed narrowly focused directional area, wherein the directional area includes a target area through which a rotating component of a rail vehicle moves during operation of the rail vehicle, and wherein the acoustic sensor is configured to enhance acoustic signals in a range of frequencies corresponding to at least one evaluated condition of the rotating component and enhance the acoustic signals received from a directional area narrowly focused on the rotating component; and

a computer system including at least one computing device configured to evaluate the rotating component by;

obtaining acoustic data corresponding to the rotating component as the rotating component moved through the target area;

determining whether any one of at least one evaluated condition is present in the rotating component based on the acoustic data corresponding to the rotating component, the determining including;

extracting a set of features from the acoustic data corresponding to the rotating component and analyzing the set of features for at least one condition feature associated with the at least one evaluated condition.

16. The system of claim 15, wherein the rotating component comprises a railroad wheel bearing.

17. The system of claim 15, further comprising a wheel sensor located adjacent to a rail over which the rail vehicle travels, wherein the wheel sensor is configured to place a timing signal into a data stream of a synchronization data channel, and wherein the obtaining includes identifying the acoustic data acquired by the acoustic sensor that corresponds to the rotating component as the rotating component moved through the target area.

18. The system of claim 15, further comprising an acoustic pre-trigger component configured to generate a signal in response to detecting an approaching set of rail vehicles, wherein the at least one computing device is further configured to activate the acoustic sensor in response to the signal.

19. The system of claim 15, wherein the evaluation further includes calculating a speed of the rail vehicle and adjusting at least one aspect of the extracting or the analyzing based on the speed of the rail vehicle.

20. The system of claim 15, further comprising an imaging device configured to acquire image data corresponding to the rotating component, wherein the evaluation further includes determining whether any one of at least one evaluated condition is present in the rotating component based on the image data and generating a result of the evaluation based on a combination of the results for both determinations.