Virtual tachometers based on time series filtering
AssigneeSikorsky Aircraft Corporation
InventorsChristopher L. Winslow, Biqing Wu, Mark W. Davis
Life of this patent
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Abstract
A system and method for receiving a plurality of first inputs from a transducer, where the plurality of first inputs correspond to vibrations of a rotational machine, and filtering the plurality of first inputs to derive a frequency of interest. The system and method then generates a sinusoidal signal at the frequency of interest and a pulse train of one or multiple pulses per revolution at the frequency of interest from the sinusoidal signal. The system and method further identifies a first pulse at a zero crossing within the pulse train and counts zero crossings to define blocks of data for use in time synchronous averaging calculations.
Claims15
A computing device, configured to:
- receive a plurality of first inputs from a transducer, the plurality of first inputs corresponding to vibrations of a rotational machine;
- wide band-pass filter the plurality of first inputs from the transducer;
- identify at least one zero-crossing of the wide band-pass filtered plurality of first inputs;
- mark each zero-crossing as a tachometer pulse to calculate an estimated shaft speed;
- narrow band-pass filter the plurality of first inputs from the transduced based on the estimated shaft speed to generate a sinusoidal signal at a frequency of interest;
- identify zero crossings in the sinusoidal signal;
- generate a pulse train of multiple pulses per revolution at the frequency of interest from the zero crossings;
- identify a first pulse at a zero crossing within the zero crossings;
- and
- count the zero crossings to define blocks of data for use in time synchronous averaging calculations.
A method, comprising:
- receiving, by a computing device, a plurality of first inputs from a transducer, the plurality of first inputs corresponding to vibrations of a rotational machine;
- wide band-pass filtering on the plurality of first inputs;
- identifying, by the computing device, at least one zero-crossing of the wide-band filtered plurality of first inputs;
- marking, by the computing device, each zero-crossing as a tachometer pulse to calculate an estimated shaft speed;
- narrow band-pass filtering on the plurality of first inputs based on the estimated shaft speed to generate, by the computing device, a sinusoidal signal at a frequency of interest;
- identifying, by the computing device, zero crossing in the sinusoidal signal;
- generating, by the computing device, a pulse train of multiple pulses per revolution at the frequency of interest from the sinusoidal signal from the zero crossings;
- identifying, by the computing device, a first pulse at a zero crossing within the zero crossings;
- and
- counting, by the computing device, the zero crossings to define blocks of data for use in time synchronous averaging calculations.
Dependencies are inferred from the claim text.