Apparatus and method for diagnosing abnormal operation of a rotor

Patent metadata

Field	Value
Publication number	US-10481034-B2
Application number	US-201615348267-A
Country	US
Kind code	B2
Filing date	Nov 10, 2016
Priority date	Nov 10, 2015
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

An apparatus for diagnosing abnormal operation of a rotor. The apparatus includes a first sensor provided around a shaft in order to detect vibration occurring while the shaft provided in a rotor axially rotates, a second sensor to generate a periodic pulse signal over time whenever the shaft rotates once, and a controller to determine an operation state of the rotor by receiving signals detected by the first and second sensors. When an aperiodic pulse signal is detected in the rotor, the controller determines a position of the rotor at which the aperiodic pulse signal is generated, and a display indicates the position of the rotor in which the aperiodic pulse signal is generated, according to information calculated by the controller.

First claim

What is claimed is:

1. An apparatus for diagnosing abnormal operation of a rotor having a shaft configured to be axially rotated, the apparatus comprising:
a display circumferentially arranged at regular intervals around the rotor and configured to display a rotor status at any of a plurality of angular positions of the rotor with respect to a specific axial position of the shaft;
a first sensor provided in a bearing mount supporting the shaft at the specific axial position to detect vibration occurring in the rotor at the specific axial position while the shaft axially rotates and to generate a vibration signal indicative of rotor acceleration over time;
a second sensor installed at a location radially relative to the specific position of the first sensor to generate a periodic pulse signal over time, the generated periodic pulse signal including a periodic pulse for each rotation of the shaft; and
a controller configured to
determine the detected vibration to be an abnormal vibration when the vibration signal includes an aperiodic pulse signal, and
control the display to display the rotor status at an angular position among the plurality of angular positions based on a timing of the abnormal vibration with respect to the periodic pulse signal.

2. The apparatus according to claim 1 , wherein the first sensor includes a vibration sensor, and the second sensor includes a tachometer sensor.

3. The apparatus according to claim 2 , wherein the second sensor comprises:
a main body having a light emitting part to irradiate the shaft with a laser;
a reflector rotating together with the shaft and reflecting the laser emitted from the light emitting part back to the main body; and
a light receiving part provided on the main body that receives the laser reflected from the reflector.

4. The apparatus according to claim 2 , wherein the second sensor is selectively installed at a position radially separated from the specific position of the first sensor by a predetermined angle.

5. The apparatus according to claim 1 , wherein the first sensor is located outside the shaft so as not to interfere with the axial rotation of the shaft.

6. The apparatus according to claim 1 , wherein the display comprises a plurality of light emitting devices circumferentially arranged at regular intervals on an outer periphery of the rotor.

7. The apparatus according to claim 1 , wherein the first sensor consists of a plurality of first sensors respectively disposed at a plurality of axial positions of the shaft to detect vibration occurring at each axial position while the shaft axially rotates, and the display consists of a plurality of displays axially arranged at regular intervals corresponding to the plurality of axial positions of the shaft.

8. The apparatus according to claim 1 , wherein a time, an interval, and an intensity in which the aperiodic pulse signal is generated are displayed on the display.

9. The apparatus according to claim 1 , wherein the controller is further configured to classify the aperiodic pulse signal included in the vibration signal and to assign an inspection period of the rotor based on the classification, and the display includes a different display for each classification.

10. The apparatus according to claim 9 , wherein the aperiodic pulse signal is classified according to intensity of the received aperiodic pulse signal, and each of the different displays is configured to display the rotor status according to the assigned inspection period as one of safe, inspection, and danger.

11. A method of diagnosing abnormal operation of a rotor having a shaft configured to be axially rotated, the method comprising:
axially supporting the shaft at a specific axial position;
generating a vibration signal indicative of rotor acceleration over time by detecting vibration occurring in the rotor at the specific axial position while the shaft axially rotates;
generating a periodic pulse signal over time, the generated periodic pulse signal including a periodic pulse for each rotation of the shaft;
determining the detected vibration to be an abnormal vibration when the vibration signal includes an aperiodic pulse signal, and
displaying a status of the rotor at an angular position of the rotor based on a timing of the abnormal vibration with respect to the periodic pulse signal in order to indicate the angular position by turning on one light emitting device among a plurality of light emitting devices circumferentially arranged at regular intervals around the rotor.

12. The method according to claim 11 , wherein the detecting vibration comprises simultaneously detecting periodic vibration and aperiodic vibration, the periodic vibration being vibration which repeatedly occurs while the shaft axially rotates, and the aperiodic vibration being vibration which occurs non-repetitively while the shaft axially rotates.

13. The method according to claim 11 , further comprising:
determining whether the detected vibration occurs in a normal state of the rotor or an abnormal state of the rotor,
wherein the vibration is determined to occur in the normal state when vibration periodically occurs while the shaft axially rotates, and the vibration is determined to occur in the abnormal state when vibration aperiodically occurs while the shaft axially rotates.

14. The method according to claim 13 , wherein the detected vibration is determined to occur in the normal state when vibration non-repetitively occurs and is not periodically repeated while the shaft axially rotates.

15. The method according to claim 13 , wherein determining whether the detected vibration occurs in a normal state or in an abnormal state comprises determining whether the vibration originates from rotation of the shaft, or whether the vibration originates from an external source.

16. The method according to claim 11 , further comprising:
determining a time of aperiodic vibration by detecting an aperiodic vibration signal between periodic vibration signals generated over time while the shaft axially rotates; and
determining a position at which the abnormal vibration occurs by converting the time of aperiodic vibration into an angle.

17. The method according to claim 11 ,
wherein the rotor has a cylindrical shape that extends by a predetermined length in an axial direction of the shaft, and
wherein the turned-on light emitting device corresponds to an occurrence position of aperiodic vibration along the predetermined length.

18. An apparatus for diagnosing abnormal operation of a rotor having a shaft configured to be axially rotated, the apparatus comprising:
a first sensor provided in a bearing mount supporting the shaft at a specific axial position along the shaft to detect vibration occurring in the rotor at the specific axial position of the bearing mount while the shaft axially rotates and to generate a vibration signal indicative of rotor acceleration over time;
a second sensor installed at a location radially relative to the specific position of the first sensor to generate a periodic pulse signal over time, the generated periodic pulse signal including a periodic pulse for each rotation of the shaft;
a display circumferentially arranged at regular intervals around the rotor in order to display a rotor status at any of a plurality of angular positions of the rotor with respect to the specific axial position of the shaft; and
a controller configured to
determine an operation state of the rotor based on the respectively generated signals, the operation state determined to be a normal state w

Assignees

• Doosan Heavy Ind & Construction Co Ltd
• Doosan Heavy Ind Constr Co Ltd

Inventors

• Son Jong Duk
• Jang Eun Sung
• Lee Gang Ju
• Eom Seung Man

Classifications

• G01M13/028

  Acoustic or vibration analysis · CPC title

• G01M1/22 Primary

  and converting vibrations due to imbalance into electric variables · CPC title

• G01H1/003 Primary

  of rotating machines (G01H1/10 takes precedence) · CPC title