Waveform Acquisition Optimization
AssigneeComputational Systems, Inc.
InventorsAnthony J. Hayzen, Jim W. Walker
Life of this patent
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Abstract
A computer-implemented process determines, based on bearing fault frequencies, optimum values for the maximum frequency (Fmax) and the number of lines of resolution (Nlines) to be used in collecting machine vibration data so as to adequately distinguish between spectral peaks for identifying faults in machine bearings. The process can be extended to any other types of fault frequencies that a machine may exhibit, such as motor fault frequencies, pump/fan fault frequencies, and gear mesh fault frequencies. Embodiments of the process also ensure that the time needed to acquire the waveform is optimized. This is particularly useful when collecting data using portable vibration monitoring devices.
Claims16
A method implemented by a computer processor for configuring a vibration data collection device to acquire machine vibration data from a machine for use in generating a vibration spectrum having amplitude peaks at a plurality of fault frequencies that are indicative of faults in the machine, wherein the machine includes components that rotate at a turning speed, the method comprising the following steps performed prior to acquiring the machine vibration data using the vibration data collection device:
- (a) specifying a number N of harmonics of the turning speed and a number M of harmonics of the plurality of fault frequencies to be included in the vibration spectrum;
- (b) calculating N number of turning speed frequencies associated with the N number of harmonics of the turning speed;
- (c) calculating M number of fault frequencies associated with the M number of harmonics of the plurality of fault frequencies;
- (d) determining a maximum frequency of data collection based at least in part on a highest frequency of the N number of turning speed frequencies and the M number of fault frequencies;
- (e) determining a minimum frequency spacing within the N number of turning speed frequencies and the M number of fault frequencies;
- (f) based on the maximum frequency and the minimum frequency spacing, determining a number of lines of resolution that will allow identification of all of the amplitude peaks associated with each of the plurality of fault frequencies that are resolvable given limitations of the vibration data collection device;
- and
- (g) configuring the vibration data collection device using the maximum frequency and the number of lines of resolution.
(canceled)
(canceled)
A method implemented by a computer processor for configuring a vibration data collection device to acquire machine vibration data from a machine for use in generating a vibration spectrum having amplitude peaks at a plurality of fault frequencies that are indicative of faults in the machine, wherein the machine includes components that rotate at a turning speed, the method comprising the following steps performed prior to acquiring the machine vibration data using the vibration data collection device:
- (a) determining a maximum frequency of data collection;
- (b) determining a minimum frequency spacing within the plurality of fault frequencies;
- (c) based on the maximum frequency and the minimum frequency spacing, determining a number of lines of resolution of data collection according to
- N
- lines
- =
- 2
- ×
- F
- m
-
- a
-
- x
- Δ
-
- f
- ,
- where Nlines is a calculated number of lines of resolution, Fmax is the maximum frequency, and Δf is the minimum frequency spacing;
- (d) configuring the vibration data collection device using the maximum frequency and the number of lines of resolution;
- (e) determining a minimum waveform data acquisition time Tacq according to
- T
- acq
- =
- N
- lines
- F
- m
-
- a
-
- x
- ;
- and
- (f) configuring the vibration data collection device using the maximum frequency, the number of lines of resolution, and the minimum waveform data acquisition time.
Dependencies are inferred from the claim text.