US 9,791,422 B2Granted

Analysis of periodic information in a signal

AssigneeComputational Systems, Inc.

InventorsStewart V. Bowers, III, Robert D. Skeirik

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Abstract

A “periodic signal parameter” (PSP) indicates periodic patterns in an autocorrelated vibration waveform and potential faults in a monitored machine. The PSP is calculated based on statistical measures derived from an autocorrelation waveform and characteristics of an associated vibration waveform. The PSP provides an indication of periodicity and a generalization of potential fault, whereas characteristics of the associated waveform indicate severity. A “periodic information plot” (PIP) is derived from a vibration signal processed using two analysis techniques to produce two X-Y graphs of the signal data that share a common X-axis. The PIP is created by correlating the Y-values on the two graphs based on the corresponding X-value. The amplitudes of Y-values in the PIP is derived from the two source graphs by multiplication, taking a ratio, averaging, or keeping the maximum value.

Claims9

Dependent claims

A method for analyzing periodic information in a signal associated with a machine or process, the method comprising:

(a) acquiring the signal over a time period using a sensor associated with the machine or process;
(b) generating an autocorrelation waveform based on the signal;
(c) determining a periodic signal parameter value based at least in part on the autocorrelation waveform, the periodic signal parameter value comprising a single real number indicative of a level of periodic information in the signal;
(d) determining a vibration waveform value based on the signal;
(e) comparing the vibration waveform value to a vibration waveform value threshold;
(f) comparing the periodic signal parameter value to a periodic signal parameter value threshold;
and
(g) generating an output indicating a no-fault condition of the machine or process if the vibration waveform value is less than the vibration waveform value threshold and the periodic signal parameter value is less than the periodic signal parameter value threshold.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/316,883Filed 27 Jun 2014 · us provisional application
Priority: 2 Jul 2013
Published: US 2015/0012247 A18 Jan 2015
Granted: 17 Oct 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G01N 29/46
Processing the detected response signal , e.g. electronic circuits specially adapted therefor: by spectral analysis, e.g. Fourier analysis or…
G01H 1/00
Measuring characteristics of vibrations in solids by using direct conduction to the
G01N 29/4427
By comparison: with stored values, e.g. threshold values
G01N 29/4454
Processing the detected response signal , e.g. electronic circuits specially adapted therefor: signal recognition, e.g. specific values or…