System and method for monitoring health of airfoils
First Claim
Patent Images
1. A method for monitoring the health of a rotating blade, comprising:
- selecting an appropriate wavelet based upon a signal representative of delta times of arrival corresponding to a rotating blade;
selecting a final decomposition level;
generating approximation coefficients and detailed coefficients utilizing a multi-resolution analysis technique and said appropriate wavelet until the final decomposition level is achieved;
equating the detailed coefficients to zero; and
generating a reconstructed signal from the approximation coefficients;
wherein the reconstructed signal is representative of static deflection in the rotating blade, andwherein the multi-resolution analysis technique comprises a plurality of decomposition levels and each of said decomposition levels comprises at least one low pass filter and at least one high pass filter to generate the approximation coefficients and the detailed coefficients, respectively.
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Abstract
A method for monitoring the health of one or more blades is presented. The method includes the steps of generating a signal representative of delta times of arrival corresponding to the rotating blade, generating a reconstructed signal by decomposing the signal representative of the delta times of arrival utilizing a multi-resolution analysis technique, wherein the reconstructed signal is representative of at least one of static deflection and dynamic deflection in the rotating blade.
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Citations
17 Claims
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1. A method for monitoring the health of a rotating blade, comprising:
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selecting an appropriate wavelet based upon a signal representative of delta times of arrival corresponding to a rotating blade; selecting a final decomposition level; generating approximation coefficients and detailed coefficients utilizing a multi-resolution analysis technique and said appropriate wavelet until the final decomposition level is achieved; equating the detailed coefficients to zero; and generating a reconstructed signal from the approximation coefficients; wherein the reconstructed signal is representative of static deflection in the rotating blade, and wherein the multi-resolution analysis technique comprises a plurality of decomposition levels and each of said decomposition levels comprises at least one low pass filter and at least one high pass filter to generate the approximation coefficients and the detailed coefficients, respectively. - View Dependent Claims (2, 3, 4)
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5. A method for monitoring the health of a rotating blade, comprising:
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generating a signal representative of filtered delta times of arrival corresponding to the rotating blade; selecting an appropriate wavelet based upon the signal representative of the filtered delta times of arrival; selecting a final decomposition level; decomposing the signal representative of the filtered delta times of arrival utilizing a multi-resolution analysis technique and the appropriate wavelet until the final decomposition level is achieved to generate approximation coefficients and detailed coefficients; and generating a reconstructed signal utilizing the approximation coefficients, wherein the reconstructed signal is representative of static deflection in the rotating blade, wherein the multi-resolution analysis technique comprises a plurality of decomposition levels and each of said decomposition levels comprises at least one low pass filter and at least one high pass filter to generate the approximation coefficients and the detailed coefficients, respectively. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A system, comprising a processing subsystem that:
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generates a signal representative of delta times of arrival corresponding to a rotating blade based upon actual times of arrival of the rotating blade; selects an appropriate wavelet based upon the signal representative of the delta times of arrival; selects a final decomposition level; decomposes the signal representative of the delta times of arrival utilizing a multi-resolution analysis technique and the appropriate wavelet until the final decomposition level is achieved to generate approximation coefficients and detailed coefficients; and generates a reconstructed signal utilizing the approximation coefficients, wherein the reconstructed signal is representative of static deflection in the rotating blade, wherein the multi-resolution analysis technique comprises a plurality of decomposition levels and each of said decomposition levels comprises at least one low pass filter and at least one high pass filter to generate the approximation coefficients and the detailed coefficients, respectively. - View Dependent Claims (12, 13, 14, 15)
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16. A non-transitory computer readable medium for a blade health monitoring system encoded with a program to instruct a computer to:
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generate a signal representative of delta times of arrival corresponding to a plurality of rotating blades based upon actual times of arrival of the plurality of rotating blades; select an appropriate wavelet in the signal representative of the delta times of arrival; select a final decomposition level; decompose the signal representative of the delta times of arrival utilizing a multi-resolution analysis technique and the appropriate wavelet until the final decomposition level is achieved to generate approximation coefficients and detailed coefficients; and generate a reconstructed signal utilizing the approximation coefficients, wherein the reconstructed signal is representative of at least one of static deflection and dynamic deflection in the plurality of rotating blades, wherein the multi-resolution analysis technique comprises a plurality of decomposition levels and each of said decomposition levels comprises at least one low pass filter and at least one high pass filter to generate the approximation coefficients and the detailed coefficients, respectively.
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17. A method for monitoring the health of a rotating blade, comprising:
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selecting an appropriate wavelet based upon a signal representative of delta times of arrival corresponding to a rotating blade, and selecting a final decomposition level; generating approximation coefficients and detailed coefficients utilizing a multi-resolution analysis technique and an appropriate wavelet until the final decomposition level is achieved; equating the approximation coefficients to zero; and generating a reconstructed signal representative of dynamic deflection from the detailed coefficients; wherein the reconstructed signal is representative of dynamic deflection in the rotating blade, and wherein the multi-resolution analysis technique comprises a plurality of decomposition levels and each of said decomposition levels comprises at least one low pass filter and at least one high pass filter to generate the approximation coefficients and the detailed coefficients, respectively.
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Specification