This paper investigates both theoretically and experimentally the effect of the location and number of sensors and magnetic bearing actuators on both global and local vibration reduction along a rotor using a feedforward control scheme. Theoretical approaches developed for the active control of beams have been shown to be useful as simplified models for the rotor scenario. This paper also introduces the time-domain LMS feedforward control strategy, used widely in the active control of sound and vibration, as an alternative control methodology to the frequency-domain feedforward approaches commonly presented in the literature. Results are presented showing that for any case where the same number of actuators and error sensors are used there can be frequencies at which large increases in vibration away from the error sensors can occur. It is also shown that using a larger number of error sensors than actuators results in better global reduction of vibration but decreased local reduction. Overall, the study demonstrated that an analysis of actuator and sensor locations when feedforward control schemes are used is necessary to ensure that harmful increased vibrations do not occur at frequencies away from rotor-bearing natural frequencies or at points along the rotor not monitored by error sensors.
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July 2003
Technical Papers
The Effect of Actuator and Sensor Placement on the Active Control of Rotor Unbalance
Marty E. Johnson, Assistant Professor,,
Marty E. Johnson, Assistant Professor,
Vibration and Acoustic Labs, Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061-0238
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Luiz P. Nascimento,
Luiz P. Nascimento
Sa˜o Paulo State University, Sa˜o Paulo, Brazil
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Mary Kasarda,
Mary Kasarda
Rotor Dynamics Group, Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061-0238
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Chris R. Fuller
Chris R. Fuller
Vibration and Acoustic Labs, Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061
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Marty E. Johnson, Assistant Professor,
Vibration and Acoustic Labs, Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061-0238
Luiz P. Nascimento
Sa˜o Paulo State University, Sa˜o Paulo, Brazil
Mary Kasarda
Rotor Dynamics Group, Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061-0238
Chris R. Fuller
Vibration and Acoustic Labs, Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061
Contributed by the Technical Committee on Vibration and Sound for publication in the Journal of Vibration and Acoustics. Manuscript received August 2001; Revised November 2002. Associate Editor. J. Wickert.
J. Vib. Acoust. Jul 2003, 125(3): 365-373 (9 pages)
Published Online: June 18, 2003
Article history
Received:
August 1, 2001
Revised:
November 1, 2002
Online:
June 18, 2003
Citation
Johnson, M. E., Nascimento, L. P., Kasarda, M., and Fuller, C. R. (June 18, 2003). "The Effect of Actuator and Sensor Placement on the Active Control of Rotor Unbalance ." ASME. J. Vib. Acoust. July 2003; 125(3): 365–373. https://doi.org/10.1115/1.1569946
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