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Active Magnetic Bearings as Actuators and Sensors in Journal Bearing Measurements

Baumann, Katrin and Dohnal, Fadi and Markert, Richard :
Active Magnetic Bearings as Actuators and Sensors in Journal Bearing Measurements.
In: 12th International Symposium on Magnetic Bearings (ISBM12), 22.-25. Aug. 2010, Wuhan, China.
[Conference or Workshop Item] , (2010)

Abstract

The present paper shows the successful usage of active magnetic bearings (AMBs) to identify the dynamic characteristics of journal bearings in the frequency domain. A test rig is operated using two AMBs supporting a rigid rotor with a centric journal bearing. An identification procedure for the stiffness and damping coefficients of journal bearings is presented. This procedure incorporates the successful application of AMBs for positioning, supporting, sensing and actuating the rotor simultaneously. For identification the real excitation force is needed. Two methods to derive a force-current-position relationship are outlined and compared: an idealized mathematical relation and a measured force-current-position map. Finally, results for applying the pre-measured map and an example of the identified stiffness and damping coefficients are given.

Item Type: Conference or Workshop Item
Erschienen: 2010
Creators: Baumann, Katrin and Dohnal, Fadi and Markert, Richard
Title: Active Magnetic Bearings as Actuators and Sensors in Journal Bearing Measurements
Language: English
Abstract:

The present paper shows the successful usage of active magnetic bearings (AMBs) to identify the dynamic characteristics of journal bearings in the frequency domain. A test rig is operated using two AMBs supporting a rigid rotor with a centric journal bearing. An identification procedure for the stiffness and damping coefficients of journal bearings is presented. This procedure incorporates the successful application of AMBs for positioning, supporting, sensing and actuating the rotor simultaneously. For identification the real excitation force is needed. Two methods to derive a force-current-position relationship are outlined and compared: an idealized mathematical relation and a measured force-current-position map. Finally, results for applying the pre-measured map and an example of the identified stiffness and damping coefficients are given.

Divisions: 16 Department of Mechanical Engineering > Institute of Applied Dynamics (AD)
16 Department of Mechanical Engineering
Event Title: 12th International Symposium on Magnetic Bearings (ISBM12)
Event Location: Wuhan, China
Event Dates: 22.-25. Aug. 2010
Date Deposited: 23 Mar 2011 15:05
Alternative keywords:
Alternative keywordsLanguage
active magnetic bearingsEnglish
actuatorEnglish
sensorEnglish
applicationEnglish
identification of dynamic propertiesEnglish
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