The Effect of Actuator and Sensor Placement on the Active Control of Rotor Unbalance

[+] Author and Article Information
Marty E. Johnson

Vibration and Acoustic Labs, Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061-0238

Luiz P. Nascimento

São Paulo State University, São 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

J. Vib. Acoust 125(3), 365-373 (Jun 18, 2003) (9 pages) doi:10.1115/1.1569946 History: Received August 01, 2001; Revised November 01, 2002; Online June 18, 2003
Copyright © 2003 by ASME
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Control flow chart showing a filtered X-LMS adaptive control system
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The global vibration level when actuator 1 is used. The two cases shown are with error sensor 1 and then with both error sensors used as part of the cost function.
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Velocity along the rotor at 100 Hz with and without control using actuator 1 and a single error sensor e1, actuator 1 and both error sensors and then both actuators and both error sensors.
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The mode shapes and natural frequencies for the first three modes of the rotor for the three different experimental mass configurations.
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Picture of experimental rig used in this study. The two magnetic bearings and unbalance mass are shown.
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The measured vibration level at the four measurement sensors S1, S2, S3 and S4 for case 1. Huge reductions in the vibration level at the error sensors (S1 and S2) were achieved (48 dB or 250 fold reduction).
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The global vibration level, when the global vibration level is the cost function, using actuator 1, actuator 2 and then both actuators.
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The mode shapes and natural frequencies of the first three modes of the rotor predicted using a beam model.
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Schematic of rotor system used for experiments and beam used in the theoretical model. The bearing supports and masses are attached at three locations along the beam. Sensors and actuator axes for the experimental system are also shown.



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