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Proceedings Paper

Effect of model error on actuator and damper placement for structural control
Author(s): Eric H. Anderson; Nesbitt W. Hagood
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Paper Abstract

Significant damping may be added to truss structures by replacing a small fraction of the members with passive or active damper struts. Although numerous methods for selecting the locations of dampers or actuators have been proposed, all rely on an accurate structural dynamic model. This paper demonstrates the effect of model error on placement when the objective is minimization of rms displacements. A group of placement algorithms is applied to a finite element model of a truss structure. The effect of adding between one and five viscous passive dampers or piezoelectric active struts in the member locations chosen is then demonstrated on the corresponding laboratory test article. Error in the analytical model leads to discrepancies between prediction and test. Predicted differences in achieved performance between simple and more complex placement algorithms are diminished. A specific pair of uncertain physical model parameters is proposed, and the resulting model error is explicitly included in a modified placement algorithm.

Paper Details

Date Published: 8 September 1993
PDF: 14 pages
Proc. SPIE 1917, Smart Structures and Materials 1993: Smart Structures and Intelligent Systems, (8 September 1993); doi: 10.1117/12.152804
Show Author Affiliations
Eric H. Anderson, Massachusetts Institute of Technology (United States)
Nesbitt W. Hagood, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 1917:
Smart Structures and Materials 1993: Smart Structures and Intelligent Systems
Nesbitt W. Hagood; Gareth J. Knowles, Editor(s)

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