Merging discrete time signals

Patent metadata

Field	Value
Publication number	US-11107297-B2
Application number	US-201816218145-A
Country	US
Kind code	B2
Filing date	Dec 12, 2018
Priority date	Dec 12, 2018
Publication date	Aug 31, 2021
Grant date	Aug 31, 2021

Abstract

A method of monitoring a condition of a system is provided. The method includes receiving a first sampled signal having first sampled points sampled at a first sampling rate, and receiving a second sampled signal having second sampled points sampled at a second sampling rate. Both the first and second sampled signals originate from sensing over a dimension in the same sensing process. The method further includes determining a first shift over the dimension between the first sampled signal and the second sampled signal at a first sampled point of the first sampled signal, determining a second shift over the dimension between the first sampled signal and the second sampled signal at a second sampled point of the first sampled signal, the second sampled point being different than the first sampled point, determining a calculated shift that is a function of the first shift and the second shift, generating a merged signal that includes each of the first sampled points and each of the second sampled points shifted based on the calculated shift, determining whether there is at least a threshold indication of failure based on analysis of the merged signal, and disabling or recommending for removal the component in response to determining that there is at least a threshold indication of failure.

First claim

What is claimed is:

1. A method of monitoring a condition of a system, the method comprising:
receiving a first sampled signal having a first plurality of sampled points that originated from a process of sensing a component of a system over a dimension, the first sampled signal being sampled at a first sampling rate, and each first sampled point having an associated measured value and a dimension value;
receiving a second sampled signal having a second plurality of sampled points that originated from the sensing process and was sampled at a second sampling rate, the second sampled points each having an associated measured value and dimension value;
determining a first shift over the dimension between the first sampled signal and the second sampled signal at a first sampled point of the first sampled signal;
determining a second shift over the dimension between the first sampled signal and the second sampled signal at a second sampled point of the first sampled signal, the second sampled point being different than the first sampled point;
determining a calculated shift that is a function of the first shift and the second shift;
generating a merged signal that includes each of the first plurality of sampled points and each of the second plurality of sampled points shifted based on the calculated shift;
determining whether there is at least a threshold indication of failure based on analysis of the merged signal; and
disabling or recommending for removal the component in response to determining that there is at least a threshold indication of failure.

2. The method of claim 1 , wherein the first sampled point has a corresponding measured value MV 1 , and determining the first shift comprises:
selecting third and fourth consecutive sampled points of the second plurality of sampled points, the third and fourth sampled points having respective corresponding measured values MV 3 and MV 4 , wherein MV 3 ≤MV 1 <MV 4 ;
determining a first line having a first slope and a first intercept that passes through the third and fourth sampled points;
determining a first point on the first line that has measured value MV 1 ; and
determining the first shift to be a first distance between a first dimension value DV 1 that corresponds to the first sampled point and a second dimension value DV 2 that corresponds to the first point.

3. The method of claim 1 , wherein the second sampled point has a corresponding measured value MV 2 and dimension DV 3 , and determining the second shift comprises:
selecting third and fourth consecutive sampled points of the second plurality of sampled points, the third and fourth sampled points having respective corresponding measured values MV 4 and MV 5 , wherein MV 4 ≤MV 2 <MV 5 ;
determining a second line having a second slope and a second intercept that passes through the third and fourth sampled points;
determining a second point on the second line that has measured value MV 2 ; and
determining the second shift to be a second distance between a second dimension value DV 3 that corresponds to the second sampled point and a second dimension value DV 5 that corresponds to the second point.

4. The method of claim 1 , further comprising selecting the first and second sampled points along a ramped portion of the first sampled signal.

5. The method of claim 1 , wherein the first and second sampled points are not consecutive sampled points.

6. The method of claim 1 , wherein the first and second sampled points are consecutive sampled points.

7. The method of claim 1 , further comprising sampling the merged signal to generate a third plurality of sampled points, wherein determining whether there is at least the threshold indication of failure is performed by analyzing the third plurality of sampled points.

8. A condition monitoring system comprising:
a memory configured to store instructions;
a processor disposed in communication with the memory, wherein:
the processor, upon execution of the instructions is configured to:
receive a first sampled signal having a first plurality of sampled points that originated from a process of sensing a component of a system over a dimension, the first sampled signal being sampled at a first sampling rate, and each first sampled point having an associated measured value and a dimension value;
receive a second sampled signal having a second plurality of sampled points that originated from the sensing process and was sampled at a second sampling rate, the second sampled points each having an associated measured value and dimension value;
determine a first shift over the dimension between the first sampled signal and the second sampled signal at a first sampled point of the first sampled signal;
determine a second shift over the dimension between the first sampled signal and the second sampled signal at a second sampled point of the first sampled signal, the second sampled point being different than the first sampled point;
determine a calculated shift that is a function of the first shift and the second shift;
generate a merged signal that includes each of the first plurality of sampled points and each of the second plurality of sampled points shifted based on the calculated shift;
determine whether there is at least a threshold indication of failure based on analysis of the merged signal; and
perform an action to have the component disabled or removed in response to determining that there is at least a threshold indication of failure.

9. The condition monitoring (CM) system of claim 8 , wherein the first sampled point has a corresponding measured value MV 1 , and determining the first shift comprises:
selecting third and fourth consecutive sampled points of the second plurality of sampled points, the third and fourth sampled points having respective corresponding measured values MV 3 and MV 4 , wherein MV 3 ≤MV 1 <MV 4 ;
determining a first line having a first slope and a first intercept that passes through the third and fourth sampled points;
determining a first point on the first line that has measured value MV 1 ; and
determining the first shift to be a first distance between a first dimension value DV 1 that corresponds to the first sampled point and a second dimension value DV 2 that corresponds to the first point.

10. The condition monitoring (CM) system of claim 8 , wherein the second sampled point has a corresponding measured value MV 1 , and determining the second shift comprises:
selecting third and fourth consecutive sampled points of the second plurality of sampled points, the third and fourth sampled points having respective corresponding measured values MV 3 and MV 4 , wherein MV 3 ≤MV 1 <MV 4 ;
determining a first line having a first slope and a first intercept that passes through the third and fourth sampled points;
determining a first point on the first line that has measured value MV 1 ; and
determining the second shift to be a first distance between a first dimension value DV 1 that corresponds to the first sampled point and a second dimension value DV 2 that corresponds to the first point.

11. The condition monitoring (CM) system of claim 8 , wherein the processor, upon execution of the instructions is configured to select the first and second sampled points along a ramped portion of the first sampled signal.

12. The condition monitoring (CM) system of claim 8 , wherein the first and second sampled points are not consecutive.

13. The condition monitoring (CM) system of claim 8 , wherein the first and second sampled points are consecutive.

14. The condition monitoring (CM) system of claim 8 , wherein the processor, upon exec

Assignees

• Simmonds Precision Products

Inventors

• Duke Alan M

Classifications

• G06F18/2134 Primary

  based on separation criteria, e.g. independent component analysis · CPC title

• H04L43/50

  Testing arrangements · CPC title

• G07C3/06 Primary

  in graphical form · CPC title

• G05B23/0221 Primary

  Preprocessing measurements, e.g. data collection rate adjustment; Standardization of measurements; Time series or signal analysis, e.g. frequency analysis or wavelets; Trustworthiness of measurements; Indexes therefor; Measurements using easily measured parameters to estimate parameters difficult to measure; Virtual sensor creation; De-noising; Sensor fusion; Unconventional preprocessing inherently present in specific fault detection methods like PCA-based methods · CPC title

• G01M13/00

  Testing of machine parts · CPC title