US 11,143,545 B2Granted

Thinning of scalar vibration data

AssigneeComputational Systems, Inc.

InventorsAnthony J. Hayzen, Christopher G. Hilemon

Life of this patent

Estimating the term…

Loading patent…

Abstract

A process for thinning scalar machine vibration data can reduce the amount of data storage required to store the data by several orders of magnitude, without losing any important machine diagnostic vibration information. The process assumes that because each scalar vibration measurement value has its own range of values, there is a unique delta change in value that does not significantly impact machine diagnostic information provided by the data. Some embodiments provide a method to automatically evaluate the delta change in value. The process can be used to thin data that have already been stored in a database, and also to thin the data in real-time during data collection. Data storage structures for storing the thinned scalar values and processes for displaying a trend plot to indicate where the scalar data have been thinned are also described.

Claims12

Dependent claims

A computer-implemented method for thinning scalar measurement data to reduce an amount of space needed in a second data storage device to save the scalar measurement data, wherein the scalar measurement data were initially recorded in a first data storage device during a measurement period, the method comprising:

(a) accessing the scalar measurement data from the first data storage device;
(b) setting an amplitude range to which a plurality of amplitude values of the scalar measurement data will be compared;
(c) setting a first or subsequent one of the amplitude values as a reference amplitude value, and setting a time corresponding to the first or subsequent one of the amplitude values as a reference time value;
(d) saving the reference amplitude value and the reference time value in the second data storage device;
(e) accessing a next amplitude value of the plurality of amplitude values from the first data storage device;
(f) determining whether an absolute difference between the reference amplitude value and the next amplitude value is greater than the amplitude range, and
if the absolute difference between the reference amplitude value and the next amplitude value is not greater than the amplitude range:
discarding the next amplitude value by not saving it in the second data storage device;
calculating an average measurement value based on a sum of the discarded next amplitude value and previously discarded amplitude values that are adjacent in time to the discarded next amplitude value;
calculating a time gap value indicating a total length of time associated with the discarded next amplitude value and previously discarded amplitude values that are adjacent in time to the discarded next amplitude value;
and
saving the average measurement value and the time gap value in the second data storage device, and
proceeding to step (g),
or
if the absolute difference between the reference amplitude value and the next amplitude value is greater than the amplitude range:
saving in the second data storage device the next amplitude value and a time at which the next amplitude value was recorded;
and
setting the next amplitude value as the reference amplitude value, and setting the time at which the next amplitude value was recorded as the reference time value;
and
(g) repeating steps (e) and (f) until all of the scalar measurement data recorded during the measurement period have been processed.

17 more elements

An apparatus for thinning scalar measurement data to reduce an amount of space needed to save the scalar measurement data, comprising:

a first data storage device in which the scalar measurement data were initially recorded during a measurement period;
a second data storage device in which the scalar measurement data are stored after thinning;
a processor in communication with the first and second data storage devices, the processor executing instructions to:
(a) access the scalar measurement data from the first data storage device;
(b) set an amplitude range to which a plurality of amplitude values of the scalar measurement data will be compared;
(c) set a first or subsequent one of the amplitude values as a reference amplitude value, and set a time corresponding to the first or subsequent one of the amplitude values as a reference time value;
(d) save the reference amplitude value and the reference time value in the second data storage device;
(e) access a next amplitude value of the plurality of amplitude values from the first data storage device;
(f) determine whether an absolute difference between the reference amplitude value and the next amplitude value is greater than the amplitude range, and
if the absolute difference between the reference amplitude value and the next amplitude value is not greater than the amplitude range:
discard the next amplitude value by not saving it in the second data storage device;
calculate an average measurement value based on a sum of the discarded next amplitude value and previously discarded amplitude values that are adjacent in time to the discarded next amplitude value;
calculate a time gap value indicating a total length of time associated with the discarded next amplitude value and previously discarded amplitude values that are adjacent in time to the discarded next amplitude value;
and
save the average measurement value and the time gap value in the second data storage device, and
proceed to step (g),
or
if the absolute difference between the reference amplitude value and the next amplitude value is greater than the amplitude range:
save in the second data storage device the next amplitude value and a time at which the next amplitude value was recorded;
and
set the next amplitude value as the reference amplitude value, and set the time at which the next amplitude value was recorded as the reference time value;
and
(g) repeat steps (e) and (f) until all of the scalar measurement data recorded during the measurement period have been processed.

20 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/273,684Filed 12 Feb 2019
Published: US 2020/0256721 A113 Aug 2020
Granted: 12 Oct 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G01H 1/003
Measuring characteristics of vibrations in solids by using direct conduction to the detector: of rotating machines
G01H 1/16
Of longitudinal or not specified vibrations: amplitude
H03M 7/3059
Compression ; Expansion; Suppression of unnecessary data, e.g. redundancy reduction: digital compression and data reduction techniques where the…
G01H
Measurement of mechanical vibrations or ultrasonic, sonic or infrasonic waves