Combined amplitude and frequency measurements for non-contacting turbomachinery blade vibration
First Claim
1. A method of measuring the vibration of a blade comprising:
- a) associating at least one first sensor with a blade, the at least one first sensor having a narrow field of measurement;
b) determining blade tip time of arrival data from the at least one first sensor to determine a total blade tip deflection;
c) associating at least one second sensor with the blade, the at least one second sensor having a wide field of view;
d) determining amplitude, frequency and phase data of the blade from the at least one second sensor;
e) determining, by the processor, the vibration of the blade using the blade tip time of arrival data and the amplitude, frequency and phase data; and
f) decomposing, by the processor, the total blade tip deflection into a deflection contribution due to each of the individual active mode of vibration of the blade.
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Accused Products
Abstract
A method and apparatus for measuring the vibration of rotating blades, such as turbines, compressors, fans, or pumps, including sensing the return signal from projected energy and/or field changes from a plurality of sensors mounted on the machine housing. One or more of the sensors has a narrow field of measurement and the data is processed to provide the referenced time of arrival of each blade, and therefore the blade tip deflection due to vibration. One or more of the sensors has a wide field of measurement, providing a time history of the approaching and receding blades, and the data is processed to provide frequency content and relative magnitudes of the active mode(s) of blade vibration. By combining the overall tip deflection magnitude with the relative magnitudes of the active modes, the total vibratory stress state of the blade can be determined.
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Citations
21 Claims
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1. A method of measuring the vibration of a blade comprising:
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a) associating at least one first sensor with a blade, the at least one first sensor having a narrow field of measurement; b) determining blade tip time of arrival data from the at least one first sensor to determine a total blade tip deflection; c) associating at least one second sensor with the blade, the at least one second sensor having a wide field of view; d) determining amplitude, frequency and phase data of the blade from the at least one second sensor; e) determining, by the processor, the vibration of the blade using the blade tip time of arrival data and the amplitude, frequency and phase data; and f) decomposing, by the processor, the total blade tip deflection into a deflection contribution due to each of the individual active mode of vibration of the blade. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of measuring the vibration of a blade comprising:
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a) associating at least one first sensor with a blade, the at least one first sensor having a narrow field of measurement; b) determining blade tip time of arrival data from the at least one first sensor; c) associating at least one second sensor with the blade, the at least one second sensor having a wide field of view; d) determining amplitude, frequency and phase data of the blade from the at least one second sensor; e) determining, by the processor, the vibration of the blade using the blade tip time of arrival data and the amplitude, frequency and phase data; f) using the time of arrival data to determine a total blade tip deflection; g) using the amplitude and phase data to determine the relative magnitudes of the active modes of vibration of the blade; and h) decomposing, by the processor, the total blade tip deflection into a deflection contribution due to each of the individual active modes of vibration of the blade. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of measuring the vibration of a blade comprising:
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a) associating a first sensor with a blade, the first sensor having a narrow field of measurement; b) determining a total blade tip deflection from the first sensor; c) associating a second sensor with the blade, the second sensor having a wide field of view; d) determining at least one of the group of amplitude, frequency and phase data of the blade from the second sensor; e) calculating, by the processor, the total vibrations of the blade from the data from the first and second sensors; and f) decomposing, by the processor, the total blade tip deflection into a deflection contribution due to each of the individual active modes of vibration of the blade. - View Dependent Claims (21)
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Specification