A novel active vibration control technique based on positive position feedback method is developed. This method, which is a modified version of positive position feedback, employs a first-order compensator that provides damping control and a second-order compensator for vibration suppression. In contrast, conventional positive position feedback uses a single second-order compensator. The technique is useful for strain-based sensors and can be applied to piezoelectrically controlled systems. After introducing the concept of modified positive position feedback, this paper investigates the stability of the new method for locating gain limits. Stability conditions are global and independent of the dynamical characteristics of the open-loop system. Using root locus plots, proper compensator frequency is identified and damping of the closed-loop system is studied. The performance of the modified positive position feedback for both steady-state and transient dynamic control is studied. The experimental and numerical results show that the proposed method is significantly more effective in controlling steady-state response and slightly advantageous for transient dynamics control, as compared with conventional positive position feedback.
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July 2009
Research Papers
Active Vibration Control With Modified Positive Position Feedback
S. Nima Mahmoodi,
S. Nima Mahmoodi
Visiting Assistant Professor
Department of Mechanical Engineering, Center for Vehicle Systems & Safety,
e-mail: mahmoodi@vt.edu
Virginia Tech
, MC-0901, Blacksburg, VA 24061
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Mehdi Ahmadian
Mehdi Ahmadian
Professor
Department of Mechanical Engineering, Center for Vehicle Systems & Safety,
e-mail: ahmadian@vt.edu
Virginia Tech
, MC-0901, Blacksburg, VA 24061
Search for other works by this author on:
S. Nima Mahmoodi
Visiting Assistant Professor
Department of Mechanical Engineering, Center for Vehicle Systems & Safety,
Virginia Tech
, MC-0901, Blacksburg, VA 24061e-mail: mahmoodi@vt.edu
Mehdi Ahmadian
Professor
Department of Mechanical Engineering, Center for Vehicle Systems & Safety,
Virginia Tech
, MC-0901, Blacksburg, VA 24061e-mail: ahmadian@vt.edu
J. Dyn. Sys., Meas., Control. Jul 2009, 131(4): 041002 (8 pages)
Published Online: April 27, 2009
Article history
Received:
July 2, 2008
Revised:
December 22, 2008
Published:
April 27, 2009
Citation
Mahmoodi, S. N., and Ahmadian, M. (April 27, 2009). "Active Vibration Control With Modified Positive Position Feedback." ASME. J. Dyn. Sys., Meas., Control. July 2009; 131(4): 041002. https://doi.org/10.1115/1.3089565
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Supplementary Material
Vibrations of Linear Piezostructures