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Shock and Vibration
Volume 14 (2007), Issue 6, Pages 393-406

An Efficient Modal Control Strategy for the Active Vibration Control of a Truss Structure

Ricardo Carvalhal,1 Vicente Lopes Júnior,1 and Michael J. Brennan2

1Mechanical Engineering Department, Universidade Estadual Paulista, UNESP/Ilha Solteira, 15385-000 Ilha Solteira, SP, Brazil
2Institute of Sound and Vibration Research, University of Southampton, Southampton, SO17 1BJ, UK

Received 29 September 2005; Revised 30 August 2006

Copyright © 2007 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In this paper an efficient modal control strategy is described for the active vibration control of a truss structure. In this approach, a feedback force is applied to each mode to be controlled according to a weighting factor that is determined by assessing how much each mode is excited by the primary source. The strategy is effective provided that the primary source is at a fixed position on the structure, and that the source is stationary in the statistical sense. To test the effectiveness of the control strategy it is compared with an alternative, established approach namely, Independent Modal Space Control (IMSC). Numerical simulations show that with the new strategy it is possible to significantly reduce the control effort required, with a minimal reduction in control performance.