Method to detect vibration nodes between a sensor and an actuator in a rotatable component

Patent metadata

Field	Value
Publication number	US-9816965-B2
Application number	US-201414541953-A
Country	US
Kind code	B2
Filing date	Nov 14, 2014
Priority date	Nov 14, 2014
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

A method of detecting a vibration node between a non-collocated sensor-actuator pair of a rotatable component includes applying an excitation signal to an actuator of the sensor actuator pair. The method also includes obtaining frequency response data from the sensor-actuator pair. The method further includes analyzing the frequency response data to ascertain a resonant frequency of the rotatable component. The method includes identifying a resonance/anti-resonance peak pair in the frequency response data for the non-collocated sensor-actuator pair. Furthermore, the method includes determining whether the vibration node is located between a sensor and the actuator of the non-collocated sensor-actuator pair based on the resonance/anti-resonance peak pair.

First claim

What is claimed is:

1. A method of detecting a vibration node between a non-collocated sensor-actuator pair of a rotatable component, the non-collocated sensor-actuator pair including a sensor and at least one electromagnetic bearing, the at least one electromagnetic bearing supporting the rotatable component for rotation therein, said method comprising:
actuating the electromagnetic bearing using a control action signal from a controller;
adding an excitation signal to the control action signal;
applying the excitation signal to the at least one electromagnetic bearing operatively coupled to the rotatable component;
obtaining frequency response data for the rotatable component from the non-collocated sensor-actuator pair;
analyzing the frequency response data to ascertain at least one resonant frequency of the rotatable component;
identifying at least one resonance/anti-resonance peak pair in the frequency response data for the non-collocated sensor-actuator pair; and
determining whether the vibration node is located between the sensor and the at least one electromagnetic bearing of the non-collocated sensor-actuator pair based on the at least one resonance/anti-resonance peak pair.

2. The method in accordance with claim 1 further comprising actuating the at least one electromagnetic bearing using a control action signal from a controller to levitate the rotatable component.

3. The method in accordance with claim 1 further comprising measuring an amount of displacement of the rotatable component with the sensor located adjacent the at least one electromagnetic bearing, wherein the sensor and the at least one electromagnetic bearing define the non-collocated sensor-actuator pair.

4. The method in accordance with claim 1 further comprising storing the frequency response data in a memory area of a controller.

5. The method in accordance with claim 1 , wherein the at least one resonance/anti-resonance peak pair includes a resonance peak and an anti-resonance peak, and wherein the resonance peak corresponds to the at least one resonant frequency of the rotatable component.

6. The method in accordance with claim 5 , wherein determining whether the vibration node is located between the sensor and the at least one electromagnetic bearing of the non-collocated sensor-actuator pair comprises determining that the vibration node is located between the sensor and the at least one electromagnetic bearing when the anti-resonance peak follows the corresponding resonance peak of the at least one resonance/anti-resonance peak pair.

7. The method in accordance with claim 1 further comprising determining a transfer function of the rotatable component based on the frequency response data of the rotatable component.

8. The method in accordance with claim 7 further comprising generating a parametric model of the rotatable component based on the transfer function.

9. The method in accordance with claim 8 further comprising modifying a control algorithm of a controller operatively coupled to the at least one electromagnetic bearing based on the transfer function of the rotatable component.

10. A method of detecting a vibration node between a non-collocated sensor-actuator pair of an active magnetic bearing system, the non-collocated sensor-actuator pair including at least one electromagnetic bearing and at least one position sensor, the active magnetic bearing system including a rotatable component and a controller, said method comprising:
calculating at least one resonant frequency of the rotatable component based on a model of the rotatable component, the at least one calculated resonant frequency corresponding to at least one bending mode of the rotatable component;
determining a control algorithm for stabilized control of the active magnetic bearing system based on the at least one calculated resonant frequency;
generating a control action signal based on the control algorithm;
actuating the electromagnetic bearing using the control action signal from the controller;
inducing a frequency response in the rotatable component using the control action signal;
obtaining frequency response data for the rotatable component from the non-collocated sensor-actuator pair coupled to the rotatable component;
comparing the at least one calculated resonant frequency to the frequency response data to identify at least one resonance peak;
analyzing the frequency response data to ascertain at least one resonance/anti-resonance peak pair based on the at least one resonance peak; and
determining whether the vibration node is located between the at least one position sensor and the at least one electromagnetic bearing of the non-collocated sensor-actuator pair for the at least one bending mode based on the at least one resonance/anti-resonance peak pair.

11. The method in accordance with claim 10 further comprising physically impacting the rotatable component to induce vibrations into the rotatable component.

12. The method in accordance with claim 10 further comprising applying an excitation signal to the electromagnetic bearing using the controller, wherein the excitation signal is added to the control action signal, and wherein the excitation signal is configured to induce vibrations into the rotatable component.

13. The method in accordance with claim 10 wherein obtaining frequency response data for the rotatable component comprises measuring an amount of displacement of the rotatable component with the least one position sensor.

14. The method in accordance with claim 10 further comprising storing the frequency response data in a memory area of the controller.

15. The method in accordance with claim 10 , wherein the at least one resonance peak substantially corresponds to the at least one calculated resonant frequency of the rotatable component.

16. The method in accordance with claim 10 , wherein the at least one resonance/anti-resonance peak pair includes the at least one resonance peak and an associated anti-resonance peak.

17. The method in accordance with claim 16 , wherein determining whether the vibration node is located between the at least one position sensor and the at least one electromagnetic bearing of the non-collocated sensor-actuator pair comprises determining that the vibration node is located between the at least one position sensor and the at least one electromagnetic bearing when the anti-resonance peak follows the associated resonance peak of the at least one resonance/anti-resonance peak pair.

18. The method in accordance with claim 10 further comprising determining a transfer function of the rotatable component based on the frequency response data.

19. The method in accordance with claim 18 further comprising generating a parametric model of the rotatable component based on the transfer function.

20. The method in accordance with claim 19 further comprising modifying the control action signal of the controller based on the transfer function of the rotatable component.

Assignees

• Gen Electric

Inventors

• Castane Selga Rosa
• Ashar Siddharth Navinchandra
• Boeld Christoph
• Osama Mohamed
• Anta Martinez Adolfo

Classifications

• G01N2291/028

  Material parameters · CPC title

• G01D5/02

  using mechanical means · CPC title

• F16C32/0487

  with active support of four degrees of freedom · CPC title

• F16C32/0444

  Details of devices to control the actuation of the electromagnets · CPC title

• F16C32/0453 Primary

  for controlling two axes, i.e. combined control of x-axis and y-axis · CPC title