Order tracking signal sampling process
First Claim
1. A hand-held data collection and analyzing unit for collecting and analyzing vibration data induced by a rotating shaft, the unit comprising:
- a first input adapted to receive an analog vibration signal representing vibrations related to the rotating shaft;
a second input adapted to receive a reference signal representing a speed of the rotating shaft; and
a digital processor configured to;
convert the analog vibration signal into corresponding sets of digital vibration samples over fixed intervals of time;
provide in response to the corresponding sets of digital vibration samples corresponding sets of output vibration samples over a selected one of the fixed intervals of time at a sample rate that varies as a function of variations in the speed of the rotating shaft during the selected fixed interval of time, and in response to a constant speed of the rotating shaft, an initial number of samples in each set of output vibrations samples less than the number of samples in a corresponding set of digital vibration samples; and
collect a time waveform record in response to a plurality of the output vibration samples, the plurality of output vibration samples collected in the time waveform record having an output sample rate varying as a function of variations in the speed of the rotating shaft.
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Accused Products
Abstract
A hand-held data collection and analyzing unit for collecting and analyzing vibration data induced by a rotating shaft including a processor that first converts the analog vibration signal into corresponding digital vibration samples. Thereafter, the processor provides in response to the digital vibration samples, corresponding output vibration samples in which samples within each set of output vibration samples are provided at a rate that varies as a function of variations in the speed of the rotating shaft. A digital processor then collects a time waveform record in response to a plurality of the output vibration samples, wherein the sample rate for the output vibration samples collected in the time waveform record varies as a function of variations in the speed of the rotating shaft.
78 Citations
20 Claims
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1. A hand-held data collection and analyzing unit for collecting and analyzing vibration data induced by a rotating shaft, the unit comprising:
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a first input adapted to receive an analog vibration signal representing vibrations related to the rotating shaft;
a second input adapted to receive a reference signal representing a speed of the rotating shaft; and
a digital processor configured to;
convert the analog vibration signal into corresponding sets of digital vibration samples over fixed intervals of time;
provide in response to the corresponding sets of digital vibration samples corresponding sets of output vibration samples over a selected one of the fixed intervals of time at a sample rate that varies as a function of variations in the speed of the rotating shaft during the selected fixed interval of time, and in response to a constant speed of the rotating shaft, an initial number of samples in each set of output vibrations samples less than the number of samples in a corresponding set of digital vibration samples; and
collect a time waveform record in response to a plurality of the output vibration samples, the plurality of output vibration samples collected in the time waveform record having an output sample rate varying as a function of variations in the speed of the rotating shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A hand-held data collection and analyzing system for collecting and analyzing vibration data produced by a rotating shaft, the system comprising:
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a first transducer adapted to provide an analog vibration signal as a function of vibrations related to the rotating shaft;
a second transducer adapted to provide an analog reference signal representing a current speed of the rotating shaft;
analog signal conditioning circuits having inputs electrically coupled to the first and second transducers and configured to amplify and filter the analog vibration and analog reference signals;
an analog to digital converter electrically coupled to the analog signal conditioning circuits and configured to provide sets of digital vibration samples and digital reference signals over fixed intervals of time as a function of the respective analog vibration and analog reference signals; and
a digital processor in electrical communication with the analog to digital converter, the digital processor configured to;
provide in response to the sets of the digital vibration samples, corresponding sets of output vibration samples over a selected one of the fixed intervals of time, each set of output vibration samples being determined as a function of the current speed of the rotating shaft, and in response to a constant speed of the rotating shaft, an initial number of samples in each set of output vibration samples less than the number of samples in a corresponding set of digital vibration samples, and perform an order tracking frequency domain analysis in response to at least two of the sets of output vibration samples.
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17. A hand-held data collection and analyzing unit for collecting and analyzing vibration data induced by a periodic mechanical system, the unit comprising:
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a first input adapted to receive an analog vibration signal representing vibrations related to the periodic mechanical system;
a second input adapted to receive a reference signal representing a frequency of the periodic mechanical system; and
a digital processor configured to;
convert the analog vibration signal into corresponding sets of digital vibration samples over fixed intervals of time, provide in response to the sets of digital vibration samples, corresponding sets of output vibration samples over a selected one of the fixed intervals of time at an output sample rate that varies as a function of variations in the frequency of the periodic mechanical system during the selected fixed interval of time, and in response to a constant frequency of the periodic mechanical system, an initial number of samples in each set of output vibration samples less than the number of samples in a corresponding set of digital vibration samples, and collect a time waveform record in response to at least two sets of the output vibration samples, the frequency of the output vibration samples in the at least two sets of output vibration samples collected in the time waveform record varying as a function of the frequency of the periodic mechanical system. - View Dependent Claims (18)
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19. A method of processing analyzing vibration data induced by a rotating shaft using a hand-held data collection and analyzing unit, the unit having a first input receiving an analog vibration signal representing vibrations related to the rotating shaft and a second input receiving a reference signal representing a current speed of the rotating shaft, the method comprising the steps of:
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converting the analog vibration signal into corresponding sets of digital vibration samples over fixed intervals of time;
providing in response to the digital vibration samples, corresponding sets of output vibration samples over a selected one of the fixed intervals of time at a sample rate that varies as a function of variations in the current speed of the rotating shaft during the selected fixed interval of time;
providing in response to a constant speed of the rotating shaft, an initial number of samples in each set of output vibrations samples less than the number of samples in a corresponding set of digital vibration samples; and
collecting a time waveform record in response to a plurality of the output vibration samples, a frequency of the output vibration samples in the plurality of output vibration samples collected in the time waveform record varying as a function of the current speed of the rotating shaft.
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20. A method of processing analyzing vibration data induced by a periodic mechanical system using a hand-held data collection and analyzing unit, the unit having a first input receiving an analog vibration signal representing vibrations related to the periodic mechanical system and a second input receiving a reference signal representing a current frequency of the periodic mechanical system, the method comprising the steps of:
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converting the analog vibration signal into corresponding sets of digital vibration samples over fixed intervals of time;
providing in response to the sets of digital vibration samples, corresponding sets of output vibration samples over a selected one of the fixed intervals of time that vary as a function of variations in the current frequency of the periodic mechanical system during the selected fixed interval of time;
providing in response to a constant frequency of the periodic mechanical system, an initial number of samples in each set of output vibrations samples less than the number of samples in a corresponding set of digital vibration samples; and
collecting a time waveform record in response to a plurality of the output vibration samples, the frequency of the output vibration samples in the plurality of output vibration samples collected in the time waveform record varying as a function of a frequency of the periodic mechanical system.
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Specification