US6567752B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
General method for tracking the evolution of hidden damage or other unwanted changes in machinery components and predicting remaining useful life
Assignee: Penn State Research Foundation
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Filing: 2001-08-15
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Granted: 2003-05-20
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Expires: 2021-08-15
Abstract
Abstract A method and apparatus for determining a slowly evolving damage state in a system having a time scale separation between a fast subsystem and a slow subsystem, the method includes acquiring measurement data of a fast subsystem of said system, determining a tracking function for the system, and evaluating the tracking function using the acquired measurement data to determine a measure of the slow damage subsystem the system.
Inventors
- 👤 Joseph Cusumano
- 👤 David Chelidze
- 👤 Anindya Chatterjee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:19
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/34; G01R31/343
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
85 words
A method for determining a slowly evolving damage state in a system having time scale separation, said method comprising: acquiring measurement data of a fast subsystem of said system; determining a tracking function for said system; evaluating said tracking function using said acquired measurement data to determine a measure of said slowly evolving damage state of said system; reconstructing a state space of said fast subsystem using said acquired data; and constructing a short time reference predictive model using parameters from said state space reconstruction.
Claim 2
Independent Claim
85 words
A method for determining a slowly evolving damage state in a system having time scale separation, said method comprising: acquiring measurement data of a fast subsystem of said system; determining a tracking function for said system; evaluating said tracking function using said acquired measurement data to determine a measure of said slowly evolving damage state of said system; reconstructing a state space of said fast subsystem using said acquired data; and constructing a short time reference predictive model using parameters from said state space reconstruction.
Claim 3
Dependent Claim
21 words
The method of claim 1 , wherein said tracking function is a short time reference model prediction error for said system.
Claim 4
Dependent Claim
22 words
The method of claim 1 , comprising a step of estimating a remaining useful life of said system using said tracking function.
Claim 5
Dependent Claim
24 words
The method of claim 1 , comprising a step of averaging a value of said tracking function for said system over said acquired data.
Claim 6
Dependent Claim
26 words
The method of claim 4 , comprising a step of estimating a remaining useful life of said system using said averaged value of said tracking function.
Claim 7
Dependent Claim
14 words
The method of claim 5 , wherein said estimate is determined using recursive filtering.
Claim 8
Dependent Claim
16 words
The method of claim 5 , wherein said estimate is determined using a linear recursive filter.
Claim 9
Dependent Claim
16 words
The method of claim 5 , wherein said estimate is determined using a nonlinear recursive filter.
Claim 10
Dependent Claim
17 words
The method of claim 1 , wherein said method is independent of damage physics of said system.
Claim 11
Dependent Claim
26 words
The method of claim 1 , wherein said slowly evolving damage state occurs on a much slower scale than a measurable characteristic of said fast system.
Claim 12
Independent Claim
103 words
An apparatus for determining a slowly evolving damage state in a system having a time scale separation, said apparatus comprising: means for acquiring measurement data of a fast subsystem of said system; means for determining a tracking function for said system; and means for evaluating said tracking function using data acquired by said means for acquiring measurement data to determine a measure of said slowly evolving damage state of said system; wherein said apparatus reconstructs a state space of said fast subsystem using said acquired data, and said apparatus constructs a short time predictive model using a parameter from said state space reconstruction.
Claim 13
Independent Claim
103 words
An apparatus for determining a slowly evolving damage state in a system having a time scale separation, said apparatus comprising: means for acquiring measurement data of a fast subsystem of said system; means for determining a tracking function for said system; and means for evaluating said tracking function using data acquired by said means for acquiring measurement data to determine a measure of said slowly evolving damage state of said system; wherein said apparatus reconstructs a state space of said fast subsystem using said acquired data, and said apparatus constructs a short time predictive model using a parameter from said state space reconstruction.
Claim 14
Dependent Claim
21 words
The apparatus of claim 11 , wherein said tracking function is a short time reference model prediction error for said system.
Claim 15
Dependent Claim
21 words
The system of claim 11 , wherein said system estimates a remaining useful life of said system using said tracking function.
Claim 16
Dependent Claim
23 words
The apparatus of claim 11 , wherein said apparatus averages a value of said tracking function for said system over said acquired data.
Claim 17
Dependent Claim
25 words
The apparatus of claim 14 , wherein said apparatus estimates a remaining useful life of said system using said averaged value of said tracking function.
Claim 18
Dependent Claim
14 words
The apparatus of claim 15 , wherein said estimate is determined using recursive filtering.
Claim 19
Dependent Claim
16 words
The apparatus of claim 15 , wherein said estimate is determined using a linear recursive filter.
Claim 20
Dependent Claim
16 words
The apparatus of claim 15 , wherein said estimate is determined using a nonlinear recursive filter.
Claim 21
Dependent Claim
22 words
The apparatus of claim 15 , wherein said apparatus determines said slowly evolving damage state independently of damage physics of said system.
Claim 22
Dependent Claim
109 words
A storage medium having computer readable program instructions embodied therein for determining a slowly evolving damage state in a system having time scale separation, said storage medium comprising: program instructions for acquiring measurement data of a fast subsystem of said system; program instructions for determining a tracking function for said system; program instructions for evaluating said tracking function using said acquired measurement data to determine a measure of said slowly evolving damage state of said system; program instructions for reconstructing a state space of said fast subsystem using said acquired data; and program instructions for constructing a short time reference predictive model using parameters from said state space reconstruction.
Claim 23
Dependent Claim
109 words
A storage medium having computer readable program instructions embodied therein for determining a slowly evolving damage state in a system having time scale separation, said storage medium comprising: program instructions for acquiring measurement data of a fast subsystem of said system; program instructions for determining a tracking function for said system; program instructions for evaluating said tracking function using said acquired measurement data to determine a measure of said slowly evolving damage state of said system; program instructions for reconstructing a state space of said fast subsystem using said acquired data; and program instructions for constructing a short time reference predictive model using parameters from said state space reconstruction.
References Cited (Backward Citations)
US5629872A
Cited
US5748851A
Cited
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