Model and Control System Development for a Distributed Actuation Magnetic Bearing and Thin-walled Rotor Subject to Noncircularity

[+] Author and Article Information
Chakkapong Chamroon

School of Engineering, University of Phayao Phayao, Phayao 56000 Thailand cc2013th@hotmail.com

Matthew O. T. Cole

Department of Mechanical Engineering University of Bath Chiang Mai, 50200 Thailand motcole@hotmail.com

Wichaphon Fakkaew

University of Phayao School of Engineering Phayao, Phayao 56000 Thailand wichaphon_me@hotmail.com

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the Journal of Vibration and Acoustics. Manuscript received November 25, 2018; final manuscript received April 3, 2019; published online xx xx, xxxx. Assoc. Editor: Costin Untaroiu.

ASME doi:10.1115/1.4043510 History: Received November 25, 2018; Accepted April 04, 2019


This paper considers the problem of controlling the vibration of a lightweight thin-walled rotor with a distributed actuation magnetic bearing (DAMB). A theoretical flexible rotor model is developed that shows how multi-harmonic vibration arises due to small noncircularity of the rotor cross-section. This model predicts a series of resonance conditions that occur when the rotational frequency matches a sub-harmonic of a system natural frequency. Rotor noncircularity can be measured off-line and this data used to cancel its effect on the position sensor signals used for feedback control. A drawback of this approach is that noncircularity is difficult to measure exactly and may vary over time due to changing thermal or elastic state of the rotor. Moreover, any additional multi-harmonic excitation effects will not be compensated. To overcome these issues, a harmonic vibration control algorithm is applied that adaptively modifies the harmonic components of the actuator control currents to match a target vibration control performance, but without affecting the stabilizing feedback control loops. Experimental results for a short rotor with single DAMB are presented that show the effectiveness of the techniques in preventing resonance during operation. By combining sensor-based noncircularity compensation with harmonic vibration control, a reduction in vibration levels can be achieved without precise knowledge of the rotor shape and with minimal bearing forces.

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