Method and system for the vibration analysis of an engine
First Claim
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1. A method for the vibration analysis of an engine, comprising:
- measuring, by vibration sensors, vibrations of the engine during acceleration and deceleration phases according to low-pressure and high-pressure rotation speeds;
spectrally acquiring, by a processor, vibration signals from the measuring of the vibrations, the vibration signals relating to the engine in order to form at least one spectrogram that represents an operating state of said engine;
selecting at least one zone of interest in said at least one spectrogram;
constructing for each zone of interest a vector of interest that represents said zone of interest by projecting said zone of interest onto an underlying representation space;
constructing a set of comparison vectors that is representative of a set of corresponding comparison zones with said zone of interest by projecting each one of said comparison zones onto said representation space, said set of comparison zones belonging to annotated spectrograms recorded in a reference database;
calculating a similarity score between said vector of interest and each one of said comparison vectors for determining a subset of comparison vectors that have a similarity score that exceeds a predetermined level;
selecting a subset of comparison zones associated to said subset of comparison vectors, said subset of comparison zones having vibration behaviours similar to those of said zone of interest; and
recovering said subset of comparison zones and annotations associated with said subset of comparison zones.
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Abstract
A method and a system for the vibration analysis of an engine, including acquiring vibration signals relating to the engine and in order to form at least one spectrogram that represents an operating state of the engine, selecting at least one zone of interest in at least one spectrogram, comparing each zone of interest with a set of corresponding comparison zones belonging to annotated spectrograms recorded in a reference database, and determining a subset of comparison zones that have vibration behaviors similar to those of the zone of interest, and displaying the subset of comparison zones and annotations associated with the subset of comparison zones.
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Citations
10 Claims
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1. A method for the vibration analysis of an engine, comprising:
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measuring, by vibration sensors, vibrations of the engine during acceleration and deceleration phases according to low-pressure and high-pressure rotation speeds; spectrally acquiring, by a processor, vibration signals from the measuring of the vibrations, the vibration signals relating to the engine in order to form at least one spectrogram that represents an operating state of said engine; selecting at least one zone of interest in said at least one spectrogram; constructing for each zone of interest a vector of interest that represents said zone of interest by projecting said zone of interest onto an underlying representation space; constructing a set of comparison vectors that is representative of a set of corresponding comparison zones with said zone of interest by projecting each one of said comparison zones onto said representation space, said set of comparison zones belonging to annotated spectrograms recorded in a reference database; calculating a similarity score between said vector of interest and each one of said comparison vectors for determining a subset of comparison vectors that have a similarity score that exceeds a predetermined level; selecting a subset of comparison zones associated to said subset of comparison vectors, said subset of comparison zones having vibration behaviours similar to those of said zone of interest; and recovering said subset of comparison zones and annotations associated with said subset of comparison zones. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for vibration analysis of an engine, said system comprising:
a processor configured to; acquire, from vibration sensors that measure vibrations of the engine during acceleration and deceleration phases according to low-pressure and high-pressure rotation speeds, vibration signals relating to the engine in order to form at least one spectrogram that represents an operating state of said engine, select at least one zone of interest in said at least one spectrogram, construct for each zone of interest a vector of interest that represents said zone of interest by projecting said zone of interest onto an underlying representation space, construct a set of comparison vectors that represent a set of corresponding comparison zones with said zone of interest by projecting each one of said comparison zones onto said representation space, said set of comparison zones belonging to annotated spectrograms recorded in a reference database, calculate a similarity score between said vector of interest and each one of said comparison vectors in order to determine a subset of comparison vectors that have a similarity score that exceeds a predetermined level, select a subset of comparison zones associated with said subset of comparison vectors, said subset of comparison zones having vibration behaviours similar to those of said zone of interest, and display said subset of comparison zones and annotations associated with said subset of comparison zones.
Specification