Dynamic, non-uniform clock for resampling and processing machine signals
First Claim
1. A method for capturing and analyzing machine signals having at least one quasi-periodic signal component, comprising the steps of:
- a) placing at least one sensor on a machine;
b) obtaining initial machine signal data from said at least one sensor;
c) conditioning said initial machine signal data to remove aliasing components and produce conditioned signal data;
d) digitizing said conditioned signal data to produce uniformly sampled data;
e) processing said uniformly sampled data to produce modified machine signal data having a non-uniform sampling rate proportional in frequency to said quasi-periodic signal component, the rate of change of which is less than a cutoff value; and
f) analyzing said modified machine signal data for the purpose of determining the operating condition and performance of the machine.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and device for processing quasi-periodic signals from machines that provides improved diagnostic results. A dynamic, non-uniform signal termed the speed clock controls processing of the signals. This processing prevents the leakage artifacts and poor frequency resolution that can mask signal components and limit the diagnostic value of existing technology. Valuable phase information, which is destroyed by existing sampling methods controlled directly by encoder signals, is retained. The invention also enables removal of large masking signal components without otherwise altering the signal. By preventing artifacts, retaining phase information, and removing undesirable signal components, the present invention is a dramatic improvement over existing technology for processing signals to determine the health and performance of operating machines.
45 Citations
24 Claims
-
1. A method for capturing and analyzing machine signals having at least one quasi-periodic signal component, comprising the steps of:
-
a) placing at least one sensor on a machine; b) obtaining initial machine signal data from said at least one sensor; c) conditioning said initial machine signal data to remove aliasing components and produce conditioned signal data; d) digitizing said conditioned signal data to produce uniformly sampled data; e) processing said uniformly sampled data to produce modified machine signal data having a non-uniform sampling rate proportional in frequency to said quasi-periodic signal component, the rate of change of which is less than a cutoff value; and f) analyzing said modified machine signal data for the purpose of determining the operating condition and performance of the machine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
-
23. A device for capturing and analyzing signals from machines comprising:
-
sensors placed about a machine for sensing machine signal data; conditioning means for filtering out aliasing components in said machine signal data; analog to digital conversion means for digitizing said conditioned signal data into digitized signal data; processing means for processing said digitized signal data to produce modified machine signal data having a frequency sampling rate proportional to the frequency of said initial machine signal data wherein said sampling rate variation remains lower than a cut off frequency; and analysis means for analyzing said modified machine signal data for the purpose of determining the operating condition of the machine. - View Dependent Claims (24)
-
Specification