Methods and systems to monitor health of rotor blades
First Claim
1. A system for monitoring health of a rotor, comprising:
- a first sensing device for measuring a first Blade Passing Signal (BPS) of a blade of a rotor at a reference point;
a second sensing device for measuring a second Blade Passing Signal (BPS) of the blade at the reference point; and
a processing subsystem for detecting an existence of a defect in the blade by;
receiving the first BPS from the first sensing device and receiving the second BPS from the second sensing device, and determining first actual Time of Arrivals (TOAs) of the blade at the reference point and determining second actual Time of Arrivals (TOAs) of the blade at the reference point;
determining first delta TOAs based on a difference between the first actual TOAs and an expected TOA of the blade at the reference point, and determining second delta TOAs based on the second actual TOAs and the expected TOA of the blade at the reference point;
determining first delta TOAs vectors and second delta TOAs vectors based on the first delta TOAs and the second delta TOAs, respectively;
selecting resonant-frequency first delta TOAs vectors and resonant-frequency second delta TOAs vectors from the first delta TOAs and the second delta TOAs, respectively, corresponding to resonant-frequency rotor speeds regions of the blade;
generating a measurement matrix based on the resonant-frequency first delta TOAs vectors and the resonant-frequency second delta TOAs vectors;
generating a resonant matrix based on the measurement matrix; and
comparing the resonant matrix to a historical resonant-frequency rotor speeds of the blade generated when there are no defects in the blade to determine an existence of a defect in the blade.
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Abstract
A system for monitoring health of a rotor is presented. The system includes a processing subsystem that generates a measurement matrix based upon a plurality of resonant-frequency first delta times of arrival vectors corresponding to a blade and a first sensing device, and a plurality of resonant-frequency second delta times of arrival vectors corresponding to the blade and a second sensing device, generates a resonant matrix based upon the measurement matrix such that entries in the resonant matrix are substantially linearly uncorrelated and linearly independent, and generates a resonance signal using a first subset of the entries of the resonant matrix, wherein the resonance signal substantially comprises common observations and components of the plurality of resonant-frequency first delta times of arrival vectors and the plurality of resonant-frequency second delta times of arrival vectors.
20 Citations
20 Claims
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1. A system for monitoring health of a rotor, comprising:
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a first sensing device for measuring a first Blade Passing Signal (BPS) of a blade of a rotor at a reference point; a second sensing device for measuring a second Blade Passing Signal (BPS) of the blade at the reference point; and a processing subsystem for detecting an existence of a defect in the blade by; receiving the first BPS from the first sensing device and receiving the second BPS from the second sensing device, and determining first actual Time of Arrivals (TOAs) of the blade at the reference point and determining second actual Time of Arrivals (TOAs) of the blade at the reference point; determining first delta TOAs based on a difference between the first actual TOAs and an expected TOA of the blade at the reference point, and determining second delta TOAs based on the second actual TOAs and the expected TOA of the blade at the reference point; determining first delta TOAs vectors and second delta TOAs vectors based on the first delta TOAs and the second delta TOAs, respectively; selecting resonant-frequency first delta TOAs vectors and resonant-frequency second delta TOAs vectors from the first delta TOAs and the second delta TOAs, respectively, corresponding to resonant-frequency rotor speeds regions of the blade; generating a measurement matrix based on the resonant-frequency first delta TOAs vectors and the resonant-frequency second delta TOAs vectors; generating a resonant matrix based on the measurement matrix; and comparing the resonant matrix to a historical resonant-frequency rotor speeds of the blade generated when there are no defects in the blade to determine an existence of a defect in the blade. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification