A method is provided for identifying resonant frequency vibration events in an assembly of rotating blades mounted on a rotor. A plurality of circumferentially spaced stationary timing probes associated with the blades detect the times at which the blades pass the respective probes. The method inclu
A method is provided for identifying resonant frequency vibration events in an assembly of rotating blades mounted on a rotor. A plurality of circumferentially spaced stationary timing probes associated with the blades detect the times at which the blades pass the respective probes. The method includes the steps of: obtaining blade timings detected by the probes, determining, for successive rotations of the assembly, respective correlation factors for one or more of the blades, each correlation factor quantifying the degree of correlation between the blade timings detected by the probes for a particular blade on a particular rotation and the blade timings detected by the probes for that blade on the previous rotation and identifying a resonant vibration event when the one or more correlation factors cross a predetermined threshold.
대표청구항▼
1. A method of identifying synchronous and asynchronous frequency vibration events of an individual blade in an assembly of rotating blades mounted on a rotor, a stationary timing probe associated with the individual blade detecting times at which the individual blade passes the stationary timing pr
1. A method of identifying synchronous and asynchronous frequency vibration events of an individual blade in an assembly of rotating blades mounted on a rotor, a stationary timing probe associated with the individual blade detecting times at which the individual blade passes the stationary timing probe, the method comprising: obtaining blade timings detected by the stationary timing probe, the blade timings corresponding to an actual position of the individual blade at a given time, the stationary timing probe being disposed relative to the individual blade such that the stationary timing probe detects blade timings;determining, for successive rotations of the individual blade, respective correlation factors for the individual blade, each correlation factor quantifying a degree of correlation between the blade timings detected by the stationary timing probe for the individual blade on a particular rotation and the blade timings detected by the stationary timing probe for the individual blade on a previous rotation;identifying at least one resonant vibration event from a group consisting of: a synchronous vibration event and an asynchronous vibration event, when at least one of the respective correlation factors crosses a predetermined threshold;determining a stress included in the individual blade; andoutputting the determined stress indicating at least one resonant vibration event in order to modify or maintain: (i) a design, (ii) an operation and/or (iii) a maintenance of the individual blade, the rotor, and/or the engine. 2. The method of claim 1, further comprising processing the blade timings by performing the substeps of: selecting the stationary timing probe;fitting an averaging curve to the blade timings of the selected stationary timing probe outside the at least one identified resonant vibration event;interpolating sections for the averaging curve at the blade timings of the selected stationary timing probe inside the at least one identified resonant vibration event;augmenting the averaging curve with the interpolated sections; andsubtracting the augmented averaging curve from the blade timings of the selected stationary timing probe to produce zeroed blade timings for the selected stationary timing probe. 3. The method of claim 1, further comprising filtering the blade timings by performing the substeps of: selecting the stationary timing probe;transforming the blade timings of the selected stationary timing probe into a frequency domain, the transformed blade timings producing tracked orders at the at least one identified resonant vibration event in a plot of frequency against time;defining integral sampling positions as frequencies corresponding to a rotational frequency of the rotor and multiples thereof up to a multiple corresponding to the number of blades in the assembly of rotating blades;for the at least one identified resonant vibration event, determining tracked order positions relative to the defined integral sampling positions; andfiltering the blade timings of the selected stationary timing probe at the at least one identified resonant vibration event in the time domain, the characteristic of the filter varying depending on the corresponding relative tracked order positions in the frequency domain. 4. The method of claim 1, wherein the step of obtaining blade timings further comprises: detecting the times at which the individual blade passes the stationary timing probe. 5. The method of claim 1, wherein the stationary timing probe measures deflections of a tip of the individual blade. 6. The method of claim 1, wherein a frequency of the at least one identified resonant vibration event is undersampled by the stationary timing probe. 7. A computer-based system for performing the method of claim 1. 8. A non-transitory computer readable medium storing computer instructions, which when executed, perform the method of claim 1. 9. The method of claim 1, further comprising: calculating the displacement of the blade from the obtained blade timing. 10. A method of processing individual blade timings detected by a stationary timing probe associated with an assembly of rotating blades mounted on a rotor, the stationary timing probe detecting times at which the individual blade passes the stationary timing probe, the method comprising: obtaining blade timings detected by the stationary timing probe to obtain timing data, the timing data corresponding to an actual position of the individual blade at a given time, the stationary timing probe being disposed relative to the individual blade such that the stationary timing probe detects blade timings;determining, for successive rotations of the individual blade, respective correlation factors for the individual blade, each correlation factor quantifying a degree of correlation between the blade timings detected by the stationary timing probe for the individual blade on a particular rotation and the blade timings detected by the stationary timing probe for the individual blade on a previous rotation;identifying in the timing data at least one resonant vibration event from a group consisting of: a synchronous vibration event and an asynchronous vibration event, when at least one of the correlation factors crosses a predetermined threshold;fitting an averaging curve to the blade timings outside the at least one identified resonant vibration event;interpolating sections for the averaging curve at the blade timings inside the at least one identified one resonant vibration event;augmenting the averaging curve with the interpolated sections;subtracting the augmented averaging curve from the blade timings to produce zeroed blade timings; andoutputting the zeroed blade timings indicating at least one resonant vibration event in order to modify or maintain: (i) a design, (ii) an operation and/or (iii) a maintenance of the individual blade, the rotor, and/or the engine. 11. The method of claim 10, further comprising filtering the blade timings by performing the substeps of: transforming the blade timings into a frequency domain, the transformed blade timings producing tracked orders at the at least one identified one or more resonant vibration event in a plot of frequency against time;defining integral sampling positions as frequencies corresponding to a rotational frequency of the rotor and multiples thereof up to a multiple corresponding to a number of blades in the assembly;for the identified one resonant vibration event, determining the tracked order positions relative to the integral sampling positions; andfiltering the blade timings at the identified resonant vibration event in the time domain, the characteristic of the filter varying depending on the corresponding relative tracked order positions in the frequency domain. 12. The method of claim 10, wherein the step of obtaining blade timings further comprises: detecting the times at which the blades pass the stationary timing probe. 13. The method of claim 10, further comprising: calculating the displacement of the blade from the obtained blade timing. 14. A method of filtering an individual blade timing detected by a stationary timing probe associated with an assembly of rotating blades mounted on a rotor, the stationary timing probe detecting the times at which the individual blade passes the stationary timing probe, the method comprising: obtaining individual blade timings detected by the stationary timing probe, the individual blade timings corresponding to an actual position of the individual blade at a given time, the stationary timing probe being disposed relative to the individual blade such that the stationary timing probe detects blade timings;identifying in the timing data at least one resonant vibration event from a group consisting of: a synchronous vibration event and an asynchronous vibration event;transforming the individual blade timings into a frequency domain, the transformed blade timings producing tracked order positions at the at least one identified resonant vibration event in a plot of frequency against time;defining integral sampling positions as frequencies corresponding to a rotational frequency of the rotor and multiples thereof up to a multiple corresponding to a number of blades in the assembly;for the at least one identified resonant vibration event, determining the tracked order positions relative to the defined integral sampling position;adaptively filtering the individual blade timings for the at least one identified resonant vibration event in a time domain, the filtering varying depending on the tracked order positions in the frequency domain;using the filtered individual blade timings to extract individual blade amplitudes and frequencies; andoutputting the individual blade amplitudes and frequencies indicating at least one resonant vibration event in order to modify or maintain: (i) a design, (ii) an operation and/or (iii) a maintenance of the individual blade, the rotor, and/or the engine. 15. The method of claim 14, further comprising: increasing filtering where a synchronous event occurs. 16. The method of claim 14, further comprising: calculating the displacement of the blade from the obtained blade timing.
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