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Shock and Vibration
Volume 17, Issue 3, Pages 285-303

Benefits and Challenges of Over-Actuated Excitation Systems

Norman Fitz-Coy,1 Vivek Nagabhushan,1 and Michael T. Hale2

1Department of Mechanical and Aerospace Engineering, University of Florida, FL, USA
2Dynamic Test Branch, Redstone Technical Test Center, U.S. Army Developmental Test Command, USA

Received 30 April 2010; Revised 30 April 2010

Copyright © 2010 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.


This paper provides a comprehensive discussion on the benefits and technical challenges of controlling over-determined and over-actuated excitation systems ranging from 1-DOF to 6-DOF. The primary challenges of over-actuated systems result from the physical constraints imposed when the number of exciters exceeds the number of mechanical degree-of-freedom. This issue is less critical for electro-dynamic exciters which tend to be more compliant than servo-hydraulic exciters. To facilitate the technical challenges discussion, generalized methods for determining the drive output commands and the actuator input transform is presented. To further provide insights into the problem, over-actuated 1-DOF and 6-DOF examples are provided. Results are presented to support the discussions.