SYSTEM AND METHOD FOR COMPONENT MONITORING

• US 20090240390A1
• Filed: 03/21/2008
• Published: 09/24/2009
• Est. Priority Date: 03/21/2008
• Status: Abandoned Application

• Current Assignee: Rochester Institute of Technology
• Original Assignee: Rochester Institute of Technology
• Inventors: Nenadic, Nenad, Thurston, Michael G., Von Pless, Gregory, Haselkorn, Michael
• Application Number:
  US12/053,191
• Publication Number:
  US 20090240390A1
• Time in Patent Office: Days
• US Class Current: 701/31
• CPC Class Codes: B60W 2510/107 Temperature
• CPC Class Codes: B60Y 2200/24 Military vehicles
• CPC Class Codes: F16H 2057/012 of gearings
• CPC Class Codes: F16H 57/01 Monitoring wear or stress of gearing elements, e.g. for triggering maintenance
• CPC Class Codes: G05B 23/0251 Abstraction hierarchy, e.g. "complex systems", i.e. system is divided in subsystems, subsystems are monitored and results are combined to decide on status of whole system

Abstract

The health of components of an asset is proactively monitored. A sensor network provides a collection of metrics from a plurality of components of an asset. The collection of metrics includes a set of metrics corresponding to each component, and the set of metrics measures at least one operating characteristic, e.g. temperature, of the corresponding component. A component algorithm processing system receives the collection of metrics and determines a relationship between each set of metrics corresponding to each component and the collection of metrics corresponding to the plurality of components. The component algorithm processing system determines if the relationships indicate a health problem with at least one of the components. The metrics can be further analyzed to determine sensor faults, the remaining life, and the short-term and long-term health of each component. For example, the monitoring system can be applied to the plurality of planetaries on a light armored vehicle.

Claims

1. A method for determining the health of a component of an asset, comprising:

receiving a collection of metrics from a plurality of components of an asset, the collection of metrics including a set of metrics corresponding to each component, the set of metrics measuring at least one operating characteristic of the corresponding component;

determining a relationship between each set of metrics corresponding to each component and the collection of metrics corresponding to the plurality of components; and

determining if the relationships indicate a health problem with at least one of the components.

2. The method according to claim 1, wherein the step of determining a relationship comprises determining a value representing the relationship, and the step of determining if the relationships indicate a health problem comprises applying a threshold to the value representing the relationship.

3. The method according to claim 1, wherein the step of determining relationships between each set of metrics and the collection of metrics comprises identifying an outlier corresponding to one of the components.

4. The method according to claim 3, further comprising determining an outlier characteristic value for the outlier.

5. The method according to claim 4, wherein the step of determining an outlier characteristic value comprises:

determining a first mean value corresponding to the plurality of components;

determining a first set of differences between the first mean value and measurements in each set of metrics corresponding to each component;

identifying, from the first set of differences, a first maximum difference, the first maximum difference corresponding to a candidate outlier component;

determining a second mean value corresponding to the plurality of components, excluding the candidate outlier component;

determining a second set of differences between the second mean value and the measurements in each set of metrics corresponding to each component;

identifying, from the second set of differences, a second maximum difference, the second maximum difference corresponding to the candidate outlier component;

determining a standard deviation according to the second set of differences excluding the second maximum difference, and

determining the outlier characteristic value as the ratio of the second maximum difference and the standard deviation.

6. The method according to claim 4, wherein the step of determining if the relationships indicate a health problem comprises comparing the outlier characteristic value to a threshold.

7. The method according to claim 1, wherein the step of receiving a collection of metrics comprises receiving the collection of metrics from sensors mounted to the plurality of components.

8. The method according to claim 7, further comprising detecting any faults in the sensors.

9. The method according to claim 8, wherein the step of detecting any faults in the sensors comprises:

determining a correlation coefficient between each pair of components; and

detecting a fault when the correlation coefficient is below a threshold.

10. The method according to claim 1, further comprising determining at least one of a short-term and a steady-state prediction for the at least one operating characteristic for each of the components.

11. The method according to claim 10, wherein the step of determining at least one of a short-term and a steady-state prediction comprises processing, in a neural network, measurements in each set of metrics.

12. The method according to claim 1, further comprising applying zero-order interpolation to the set of metrics corresponding to each component if the set of metrics includes measurements taken at a non-uniform sampling rate.

13. The method according to claim 1, further comprising categorizing a health of each component and communicating the health of each component to a user.

14. The method according to claim 1, wherein the components are planetaries and the collection of metrics includes temperature measurements for the planetaries.

15. The method according to claim 14, further comprising receiving speed data corresponding to a vehicle including the planetaries.

16. The method according to claim 14, wherein the temperature measurements are received from sensors positioned on a housing of each planetary.

17. The method according to claim 16, further comprising adjusting the temperature measurements received from the sensors on the housing to indicate temperatures of the planetary within each housing.

18. The method according to claim 17, wherein the step of adjusting the temperature measurements comprises adjusting the temperature measurements to indicate temperatures at planet gear pins of each planetrary.

19. The method according to claim 1, further comprising determining a remaining useful life for each component.

20. The method according to claim 19, wherein the components are planetaries, the collection of metrics includes temperature measurements for the planetaries, and the step of determining a remaining useful life for each planetary comprises determining a bushing thickness for each planetary.

21. The method according to claim 20, wherein the step of determining a bushing thickness for each planetary comprises determining wear coefficients for the bushing based on the temperature measurements.

22. The method according to claim 1, wherein the components are subject to substantially similar operating contexts.

23. A system for determining the health of a component of an asset, comprising:

a sensor network including sensors collecting metrics from a plurality of components of an asset, each component providing a set of metrics measuring at least one operating characteristic of the corresponding component; and

a processing system receiving the metrics from the sensor network, determining a relationship between each set of metrics corresponding to each component and the collection of metrics corresponding to the plurality of components, and determining if the relationships indicate a health problem with at least one of the components.

24. The system according to claim 23, wherein the processing system determines a value representing the relationship, and applies a threshold to the value representing the relationship.

25. The system according to claim 23, wherein the processing system identifies an outlier corresponding to one of the components.

26. The system according to claim 25, wherein the processing system determines an outlier characteristic value for the outlier.

27. The system according to claim 26, wherein the processing system determines an outlier characteristic value by:

determining a first mean value corresponding to the plurality of components;

determining a first set of differences between the first mean value and measurements in each set of metrics corresponding to each component;

identifying, from the first set of differences, a first maximum difference, the first maximum difference corresponding to a candidate outlier component;

determining a second mean value corresponding to the plurality of components, excluding the candidate outlier component;

determining a second set of differences between the second mean value and the measurements in each set of metrics corresponding to each component;

identifying, from the second set of differences, a second maximum difference, the second maximum difference corresponding to the candidate outlier component;

determining a standard deviation according to the second set of differences excluding the second maximum difference, and

determining the outlier characteristic value as the ratio of the second maximum difference and the standard deviation.

28. The system according to claim 26, wherein the processing system compares the outlier characteristic value to a threshold.

29. The system according to claim 23, wherein the processing system detects any faults in the sensors of the sensor network.

30. The system according to claim 29, wherein the processing system determines a correlation coefficient between each pair of components and detects a fault when the correlation coefficient is below a threshold.

31. The system according to claim 23, wherein the processing system determines at least one of a short-term and a steady-state prediction for the at least one operating characteristic for each of the components.

32. The system according to claim 31, wherein the processing system processes measurements in each set of metrics in a neural network.

33. The system according to claim 23, measurements in each set of metrics applies zero-order interpolation to the set of metrics corresponding to each component if the set of metrics includes measurements taken at a non-uniform sampling rate.

34. The system according to claim 23, further comprising a user interface coupled to the processing system and providing information on a health of each component, wherein the processing system categorizes the health of each component.

35. The system according to claim 23, wherein the components are planetaries and the sensor network collects temperature measurements for the planetaries.

36. The system according to claim 35, wherein the processing system further receives speed data corresponding to a vehicle including the planetaries.

37. The system according to claim 35, wherein each sensor is positioned on a housing of one of the planetaries.

38. The system according to claim 37, wherein the processing system adjusts the temperature measurements received from the sensors on the housing to indicate temperatures of the planetary within each housing.

39. The system according to claim 38, wherein the processing system adjusts the temperature measurements to indicate temperatures at planet gear pins of each planetrary.

40. The system according to claim 23, wherein the processing system determines a remaining useful life for each component.

41. The system according to claim 40, wherein the components are planetaries, the collection of metrics includes temperature measurements for the planetaries, and the processing system determines a bushing thickness for each planetary.

42. The system according to claim 41, wherein the processing system determines a bushing thickness for each planetary by determining wear coefficients for the bushing based on the temperature measurements.

43. The system according to claim 23, wherein the components are subject to substantially similar operating contexts.