Methods and systems for non-contact magnetostrictive sensor runout compensation

Patent metadata

Field	Value
Publication number	US-2020166418-A1
Application number	US-201916678261-A
Country	US
Kind code	A1
Filing date	Nov 8, 2019
Priority date	Jan 27, 2017
Publication date	May 28, 2020
Grant date	—

Abstract

A stress sensing system for measuring stress in a conductive target material includes at least one sensor positioned proximate to the conductive target material. The sensor is configured to measure stress in the conductive target material and to transmit a signal indicative of the measured stress to a controller. The controller is coupled in communication with the sensor. The controller is configured to receive the signal from the sensor, determine a runout portion of the signal corresponding to the runout of the conductive target material, determine a runout pattern waveform from the runout portion, and subtract the runout pattern waveform from the signal.

First claim

1 . A stress sensing system for measuring stress in a conductive target material, said stress sensing system comprising:
at least one sensor positioned proximate to the conductive target material, said at least one sensor configured to measure stress in the conductive target material and to transmit at least one signal indicative of the measured stress; and at least one controller coupled in communication with said at least one sensor, said at least one controller configured to:
receive the at least one signal from said at least one sensor;
determine a runout portion of the at least one signal corresponding to runout of the conductive target material;
determine a runout pattern waveform from the runout portion; and
subtract the runout pattern waveform from the at least one signal.

2 . A stress sensing system in accordance with claim 1 further comprising at least one speed sensor configured to sense rotation of the conductive target material and transmit a rotation signal to said at least one controller.

3 . A stress sensing system in accordance with claim 2 , wherein said at least one controller configured to determine a runout portion of the at least one signal further comprises said at least one controller configured to estimate a rotational speed of the conductive target material based on the rotation signal.

4 . A stress sensing system in accordance with claim 1 , wherein said at least one controller is further configured to select a zero stress portion of the at least one signal corresponding to a zero stress condition of the conductive target material.

5 . A stress sensing system in accordance with claim 4 , wherein said at least one controller is further configured to:
resample the zero stress portion to an angle domain corresponding to the conductive target material; and extract a sample portion of the zero stress portion to define a time-synchronous runout pattern of the at least one signal, the sample portion including a first portion of the zero stress portion corresponding to a single rotation of the conductive target material.

6 . A stress sensing system in accordance with claim 5 , wherein the sample portion of the zero stress portion comprises a first portion and a second portion of the zero stress portion, the first and second portions of the zero stress portion corresponding to a first and a second rotation of the conductive target material, respectively, and wherein said at least one controller configured to determine a runout pattern waveform further comprises said at least one controller configured to average the first and second portions of the zero stress portion.

7 . A stress sensing system in accordance with claim 1 , wherein said at least one sensor comprises a first sensor and a second sensor, and the at least one signal includes a first signal and a second signal, respectively, said at least one controller further configured to average the first and second signals together to reduce signal noise attributed to mechanical vibration.

8 . A computer-implemented method for reducing runout and vibration noise from a stress sensing system, said method comprising:
receiving at least one signal from at least one stress sensor, the at least one signal indicative of stress in a conductive target material; determining a runout portion of the at least one signal corresponding to runout of the conductive target material; determining a runout pattern waveform from the runout portion; and subtracting the runout pattern waveform from the at least one signal.

9 . A computer-implemented method in accordance with claim 8 further comprising rotating the conductive target material comprising:
rotating the conductive target material under a zero stress condition, in which the conductive target material is not subject to an external stress; and
applying an external stress to the conductive target material such that the conductive target material is rotating under a non-zero stress condition.

10 . A computer-implemented method in accordance with claim 9 , wherein receiving at least one signal comprises receiving the at least one signal under the zero stress condition and the non-zero stress condition.

11 . A computer-implemented method in accordance with claim 8 further comprising estimating a rotational speed of the conductive target material.

12 . A computer-implemented method in accordance with claim 8 further comprising selecting a zero stress portion of the at least one signal corresponding to the zero stress condition of the conductive target material.

13 . A computer-implemented method in accordance with claim 12 further comprising:
resampling the zero stress portion to an angle domain corresponding to the conductive target material; and
extracting a sample portion of the zero stress portion to define a time-synchronous runout pattern of the at least one signal, the sample portion including a first portion of the zero stress portion corresponding to a single rotation of the conductive target material.

14 . A computer-implemented method in accordance with claim 13 , wherein the sample portion of the zero stress portion includes a first portion and a second portion of the zero stress portion, wherein the first and second portions of the zero stress portion correspond to a first and a second rotation of the conductive target material, respectively, and wherein determining a runout pattern waveform further comprises averaging the first and second portions of the zero stress portion to determine the runout pattern waveform.

15 . A computer-implemented method in accordance with claim 13 , wherein determining a runout pattern waveform further comprises converting the time-synchronous runout pattern of the at least one signal to the time domain.

16 . A computer-implemented method in accordance with claim 8 , wherein receiving at least one signal from at least one stress sensor comprises receiving a first signal from a first stress sensor and receiving a second signal from a second stress sensor, said method further comprising averaging the first and second signals together to reduce signal noise attributable to mechanical vibration of the conductive target material.

17 . A non-transitory computer readable medium that includes computer executable instructions for reducing runout and vibration noise from a stress sensing system, the stress sensing system including a computing device, wherein when executed by the computing device, the computer executable instructions cause the computing device to:
receive at least one signal from at least one stress sensor, the at least one signal indicative of stress in a conductive target material; determine a runout portion of the at least one signal that corresponds to runout of the conductive target material; determine a runout pattern waveform from the runout portion of the at least one signal; and subtract the runout pattern waveform from the at least one signal.

18 . A non-transitory computer readable medium in accordance with claim 17 , wherein the computer executable instructions further cause the computing device to estimate a rotational speed of the conductive target material.

19 . A non-transitory computer readable medium in accordance with claim 17 , wherein the conductive target material is under a period of zero stress and a period of non-zero stress, wherein determining the runout portion comprises the computer executable instructions further causing the computing device to select a zero stress portion of the at least one signal corresponding to

Assignees

• Gen Electric

Inventors

• Howard Brian F
• Lu Dan Tho
• Turnbeaugh Lysle
• Folkner David Erik

Classifications

• G01L1/125 Primary

  by using magnetostrictive means (magnetostrictive sensors H10N35/101) · CPC title

• G01L3/102

  involving magnetostrictive means (magnetostrictive sensors H10N35/101) · CPC title

• G01L1/26

  Auxiliary measures taken, or devices used, in connection with the measurement of force, e.g. for preventing influence of transverse components of force, for preventing overload · CPC title