Transient performance data phase compensation system and method

• US 8,036,844 B2
• Filed: 03/24/2008
• Issued: 10/11/2011
• Est. Priority Date: 03/24/2008
• Status: Active Grant

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Hemmingson, Alan, Harris, Oswald, Ling, Richard
• Primary Examiner(s): Barbee; Manuel L
• Application Number:
  US12/053,994
• Publication Number:
  US 20090240470A1
• Time in Patent Office: 1,296 Days
• Field of Search: 702/71, 702/72, 702/79, 702/89, 702/178, 702/187, 324/76.77, 324/76.82, 324/76.83
• US Class Current: 702/89
• CPC Class Codes: G05B 23/0221 Preprocessing measurements, e.g. data collection rate adjustment; Standardization of measurements; Time series or signal analysis, e.g. frequency analysis or wavelets; Trustworthiness of measurements; Indexes therefor; Measurements using easily measured parameters to estimate parameters difficult to measure; Virtual sensor creation; De-noising; Sensor fusion; Unconventional preprocessing inherently present in specific fault detection methods like PCA-based methods

Abstract

A system and method of phase compensating transient performance data are provided. Transient performance data are collected for a plurality of parameters, and two of the parameters are selected. A transfer function is applied to the transient performance data for at least one of the selected parameters to thereby generate phase compensated performance data that is representative of a steady state relationship between the selected parameters.

Claims

1. A method of phase compensating transient performance data, comprising the steps of:

supplying transient performance data for a plurality of parameters from a plurality of sensors to a processor; and

in the processor;

selecting two of the parameters;

determining whether a transfer function is a known transfer function or an unknown transfer function;

when the transfer function is a known transfer function, applying the transfer function to the transient performance data for at least one of the selected parameters to thereby generate phase compensated performance data representative of a steady state relationship between the selected parameters; and

when the transfer function is not known;

selecting a default set of transfer functions;

applying the default set of transfer functions to the data for the selected parameters to generate a plurality of phase compensated performance data sets; and

selecting the transfer function to which the transient performance data for the at least one selected parameter are applied based on the plurality of phase compensated performance data sets.

2. The method of claim 1, wherein the step of selecting the transfer function comprises:

applying a curve fit to each phase compensated data set to generate a plurality of steady state maps, each steady state map associated with each phase compensated data set and being representative of a steady state relationship between the selected parameters;

determining the standard deviation of each steady state map; and

selecting the steady state map with the smallest standard deviation; and

optimizing the transfer function associated with the selected steady state map until the standard deviation associated with the selected steady state map is minimized.

3. The method of claim 1, further comprising:

applying a curve fit to the phase compensated performance data to generate a steady state map that is representative of the steady state relationship between the selected parameters.

4. The method of claim 3, wherein the steady state map comprises a steady state table.

5. The method of claim 3, wherein the steady state map comprises a steady state equation.

6. The method of claim 1, wherein:

the transient performance data for one of the selected parameters leads the transient performance data for the other of the selected parameters; and

the transfer function comprises one or more of a lead filter and a lag filter.

7. The method of claim 1, further comprising:

applying one or more ambient condition corrections to the collected transient performance data to thereby generate corrected transient performance data,

wherein the step of applying the transfer function to the transient performance data for at least one of the selected parameters comprises applying the transfer function to the corrected transient performance data.

8. The method of claim 1, wherein the transient performance data are associated with a machine, and wherein the method further comprises:

determining health status of the machine from the phase compensated performance data.

9. A system for phase compensating transient performance data, comprising:

a plurality of sensors, each sensor operable to sense a parameter and supply transient performance data representative of the sensed parameter; and

a processor coupled to receive the transient performance data from each of the plurality of sensors and configured to;

(i) select two of the parameters,

(ii) determine whether a transfer function is a known transfer function or an unknown transfer function,

(iii) when the transfer function is determined to be a known transfer function, apply the known transfer function to the transient performance data for at least one of the selected parameters to thereby generate phase compensated performance data that is representative of a steady state relationship between the selected parameters, and

(iv) when the transfer function is determined to be an unknown transfer function;

select a default set of transfer functions,

apply the default set of transfer functions to the data for the selected parameters to generate a plurality of phase compensated performance data sets, and

select the transfer function to which the transient performance data for the at least one selected parameter are applied based on the plurality of phase compensated performance data sets.

10. The system of claim 9, wherein processor is further configured to:

apply a curve fit to each phase compensated data set to generate a plurality of steady state maps, each steady state map associated with each phase compensated data set and being representative of a steady state relationship between the selected parameters;

determine the standard deviation of each steady state map; and

select the steady state map with the smallest standard deviation; and

optimize the transfer function associated with the selected steady state map until the standard deviation associated with the selected steady state map is minimized,

whereby the transfer function to which the transient performance data for the at least one selected parameter are applied is selected.

11. The system of claim 9, wherein the processor is further configured to apply a curve fit to the phase compensated performance data to generate a steady state map that is representative of the steady state relationship between the selected parameters.

12. The system of claim 11, wherein the steady state map comprises a steady state table.

13. The system of claim 11, wherein the steady state map comprises a steady state equation.

14. The system of claim 9, wherein:

the transient performance data for one of the selected parameters leads the transient performance data for the other of the selected parameters; and

the transfer function comprises one or more of a lead filter and a lag filter.

15. The system of claim 9, wherein the processor is further configured to:

apply one or more ambient condition corrections to the collected transient performance data to thereby generate corrected transient performance data; and

apply the transfer function to the corrected transient performance data for at least one of the selected parameters.

16. The system of claim 9, wherein:

the transient performance data are associated with a machine, and

the processor is further configured to determine health status of the machine from the phase compensated performance data.

17. A system for phase compensating transient performance data, comprising:

a plurality of sensors, each sensor operable to sense a parameter and supply transient performance data representative of the sensed parameter; and

a processor coupled to receive the transient performance data from each of the plurality of sensors and configured to;

(i) select two of the parameters,

(ii) apply a transfer function to the transient performance data for at least one of the selected parameters to thereby generate phase compensated performance data that is representative of a steady state relationship between the selected parameters, and

(iii) apply a curve fit to the phase compensated performance data to generate a steady state map that is representative of the steady state relationship between the selected parameters.