US6643569B2
Expired / Lapsed
US
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Method and system for detecting a failure or performance degradation in a dynamic system such as a flight vehicle
Assignee: University of Michigan (System)
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Filing: 2002-03-28
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Granted: 2003-11-04
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Expires: 2022-03-28
Abstract
Abstract A method and system for detecting a failure or performance degradation in a dynamic system having sensors for measuring state variables and providing corresponding output signals in response to one or more system input signals are provided. The method includes calculating estimated gains of a filter and selecting an appropriate linear model for processing the output signals based on the input signals. The step of calculating utilizes one or more models of the dynamic system to obtain estimated signals. The method further includes calculating output error residuals based on the output signals and the estimated signals. The method also includes detecting one or more hypothesized failures or performance degradations of a component or subsystem of the dynamic system based on the error residuals. The step of calculating the estimated values is performed optimally with respect to one or more of: noise, uncertainty of parameters of the models and un-modeled dynamics of the dynamic system which may be a flight vehicle or financial market or modeled financial system.
Inventors
- 👤 Robert H. Miller
- 👤 William B. Ribbens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:16
CPC Classifications
G; G05; G05B; G05B23/00; G05B23/02; G05B23/0205; G05B23/0218; G05B23/0243; G05B23/0245; G06; G06Q; G06Q10/00; G06Q10/04; G06Q50/00; G06Q50/40
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
154 words
A method for detecting a failure or performance degradation in a dynamic system having sensors for measuring state variables of the system and providing corresponding output signals in response to at least one system input signal, the method comprising: calculating estimated gains of a filter and selecting an appropriate linear model for processing the output signals based on the at least one system input signal, the step of calculating utilizing at least one model of the dynamic system to obtain estimated signals; calculating output error residuals based on the output signals and the estimated signals; and detecting at least one hypothesized failure or performance degradation of a component or subsystem of the dynamic system based on the error residuals, wherein the step of calculating the estimated gains is performed optimally with respect to one or more of: noise, uncertainty of parameters of the at least one model and un-modeled dynamics of the dynamic system.
Claim 2
Independent Claim
154 words
A method for detecting a failure or performance degradation in a dynamic system having sensors for measuring state variables of the system and providing corresponding output signals in response to at least one system input signal, the method comprising: calculating estimated gains of a filter and selecting an appropriate linear model for processing the output signals based on the at least one system input signal, the step of calculating utilizing at least one model of the dynamic system to obtain estimated signals; calculating output error residuals based on the output signals and the estimated signals; and detecting at least one hypothesized failure or performance degradation of a component or subsystem of the dynamic system based on the error residuals, wherein the step of calculating the estimated gains is performed optimally with respect to one or more of: noise, uncertainty of parameters of the at least one model and un-modeled dynamics of the dynamic system.
Claim 3
Dependent Claim
17 words
The method as claimed in claim 1 wherein the step of calculating estimated gains is performed continually.
Claim 4
Dependent Claim
16 words
The method as claimed in claim 1 wherein the dynamic system is a closed-loop dynamic system.
Claim 5
Dependent Claim
29 words
The method as claimed in claim 1 further comprising generating a signal for each hypothesized failure or performance degradation and storing each signal in a database for subsequent retrieval.
Claim 6
Dependent Claim
34 words
The method as claimed in claim 1 further comprising generating a signal for each hypothesized failure or performance degradation and processing each signal to diagnose the at least one hypothesized failure or performance degradation.
Claim 7
Dependent Claim
28 words
The method as claimed in claim 1 further comprising generating a signal for each hypothesized failure or performance degradation and processing each signal to obtain a reconfiguration signal.
Claim 8
Dependent Claim
40 words
The method as claimed in claim 6 wherein the dynamic system has a controller and wherein the method further comprises reconfiguring the controller based on the reconfiguration signal to compensate for the at least one hypothesized failure or performance degradation.
Claim 9
Dependent Claim
27 words
The method as claimed in claim 7 wherein the at least one hypothesized failure or performance degradation is a failure or degradation of one of the sensors.
Claim 10
Dependent Claim
30 words
The method as claimed in claim 8 wherein the reconfiguration signal inserts an estimated or compensated value of the output signal of the failed or degraded sensor into the controller.
Claim 11
Dependent Claim
44 words
The method as claimed in claim 6 wherein the dynamic system has a controller and at least one actuator and wherein the method further comprises reconfiguring the controller based on the reconfiguration signal to compensate for a change of the at least one actuator.
Claim 12
Dependent Claim
22 words
The method as claimed in claim 1 wherein the dynamic system is a flight vehicle and the sensors include flight control sensors.
Claim 13
Dependent Claim
40 words
The method as claimed in claim 1 wherein the dynamic system is a physical system characterized by a nonlinear dynamic model having parameters and wherein changes in the dynamic system are manifest by parameter changes in the nonlinear dynamic model.
Claim 14
Dependent Claim
29 words
The method as claimed in claim 1 wherein the error residuals are propagated in a unique direction in output detection space for a given hypothesized failure or performance degradation.
Claim 15
Dependent Claim
27 words
The method as claimed in claim 1 wherein the step of calculating estimated gains includes the step of controllably selecting parameters of the at least one model.
Claim 16
Dependent Claim
15 words
The method as claimed in claim 1 wherein the step of detecting detects intermittent faults.
Claim 17
Dependent Claim
26 words
The method as claimed in claim 13 wherein the step of detecting is based on magnitude and direction of the error residuals in the detection space.
Claim 18
Dependent Claim
53 words
The method as claimed in claim 1 wherein the at least one model includes non-dimensional variables and wherein the step of detecting includes the step of converting from the non-dimensional variables to dimensional variables to obtain re-scaled error residuals and wherein the step of detecting is also based on the re-scaled error residuals.
Claim 19
Dependent Claim
40 words
The method as claimed in claim 1 wherein a plurality of mathematical models are utilized to model the dynamic system and wherein the step of calculating estimated gains includes the step of selecting one of the plurality of mathematical models.
Claim 20
Dependent Claim
162 words
A detection system for detecting a failure or performance degradation in a dynamic system having sensors for measuring state variables of the dynamic system and providing corresponding output signals in response to at least one system input signal, the detection system comprising: means for calculating estimated gains of a filter and selecting an appropriate linear model for processing the output signals based on the at least one system input signal, the means for calculating utilizing at least one model of the dynamic system to obtain estimated signals; means for calculating output error residuals based on the output signals and the estimated signals; and means for detecting at least one hypothesized failure or performance degradation of a component or subsystem of the dynamic system based on the error residuals, wherein the means for calculating the estimated gains calculates optimally with respect to one or more of: noise, uncertainty of parameters of the at least one model and un-modeled dynamics of the dynamic system.
Claim 21
Dependent Claim
162 words
A detection system for detecting a failure or performance degradation in a dynamic system having sensors for measuring state variables of the dynamic system and providing corresponding output signals in response to at least one system input signal, the detection system comprising: means for calculating estimated gains of a filter and selecting an appropriate linear model for processing the output signals based on the at least one system input signal, the means for calculating utilizing at least one model of the dynamic system to obtain estimated signals; means for calculating output error residuals based on the output signals and the estimated signals; and means for detecting at least one hypothesized failure or performance degradation of a component or subsystem of the dynamic system based on the error residuals, wherein the means for calculating the estimated gains calculates optimally with respect to one or more of: noise, uncertainty of parameters of the at least one model and un-modeled dynamics of the dynamic system.
Claim 22
Dependent Claim
15 words
The detection system as claimed in claim 19 wherein the estimated gains are calculated continually.
Claim 23
Dependent Claim
17 words
The detection system as claimed in claim 19 wherein the dynamic system is a closed-loop dynamic system.
Claim 24
Dependent Claim
32 words
The detection system as claimed in claim 19 further comprising means for generating a signal for each hypothesized failure or performance degradation and a database for storing each signal for subsequent retrieval.
Claim 25
Dependent Claim
39 words
The detection system as claimed in claim 19 further comprising means for generating a signal for each hypothesized failure or performance degradation and means for processing each signal to diagnose the at least one hypothesized failure or performance degradation.
Claim 26
Dependent Claim
33 words
The detection system as claimed in claim 19 further comprising means for generating a signal for each hypothesized failure or performance degradation and means for processing each signal to obtain a reconfiguration signal.
Claim 27
Dependent Claim
44 words
The detection system as claimed in claim 24 wherein the dynamic system has a controller and wherein the detection system further comprises means for reconfiguring the controller based on the reconfiguration signal to compensate for the at least one hypothesized failure or performance degradation.
Claim 28
Dependent Claim
28 words
The detection system as claimed in claim 25 wherein the at least one hypothesized failure or performance degradation is a failure or degradation of one of the sensors.
Claim 29
Dependent Claim
31 words
The detection system as claimed in claim 26 wherein the reconfiguration signal inserts an estimated or compensated value of the output signal of the failed or degraded sensor into the controller.
Claim 30
Dependent Claim
48 words
The detection system as claimed in claim 24 wherein the dynamic system has a controller and at least one actuator and wherein the detection system further comprises means for reconfiguring the controller based on the reconfiguration signal to compensate for a change of the at least one actuator.
Claim 31
Dependent Claim
23 words
The detection system as claimed in claim 19 wherein the dynamic system is a flight vehicle and the sensors include flight control sensors.
Claim 32
Dependent Claim
41 words
The detection system as claimed in claim 19 wherein the dynamic system is a physical system characterized by a nonlinear dynamic model having parameters and wherein changes in the dynamic system are manifest by parameter changes in the nonlinear dynamic model.
Claim 33
Dependent Claim
30 words
The detection system as claimed in claim 19 wherein the error residuals are propagated in a unique direction in output detection space for a given hypothesized failure or performance degradation.
Claim 34
Dependent Claim
27 words
The detection system as claimed in claim 19 wherein the means for calculating estimated gains includes means for controllably selecting parameters of the at least one model.
Claim 35
Dependent Claim
16 words
The detection system as claimed in claim 19 wherein the means for detecting detects intermittent faults.
Claim 36
Dependent Claim
27 words
The detection system as claimed in claim 31 wherein the means for detecting detects based on magnitude and direction of the error residuals in the detection space.
Claim 37
Dependent Claim
52 words
The detection system as claimed in claim 19 wherein the at least one model includes non-dimensional variables and wherein the means for detecting includes means for converting from the non-dimensional variables to dimensional variables to obtain re-scaled error residuals and wherein the means for detecting detects based on the re-scaled error residuals.
Claim 38
Dependent Claim
40 words
The detection system as claimed in claim 19 wherein a plurality of mathematical models are utilized to model the dynamic system and wherein the means for calculating estimated gains includes means for selecting one of the plurality of mathematical models.
Claim 39
Dependent Claim
19 words
The method as claimed in claim 1 wherein the dynamic system is a financial market or modeled financial system.
Claim 40
Dependent Claim
20 words
The detection system as claimed in claim 19 wherein the dynamic system is a financial market or modeled financial system.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-11-03 | 2007-05-05 | 2007-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-11-03 | 2011-05-05 | 2011-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-11-03 | 2015-05-05 | 2015-11-04 | $7700.00 | Window Closed / Lapsed |