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Proceedings Paper

Piezoelectric damping of flexible structures using novel electrode shape design
Author(s): Forouza Pourki; Horacio Sosa
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Paper Abstract

The so called `adaptive' or `smart structures' are a new generation of structures in which the principles of control engineering are used to make a structure to adapt to a set of required geometric or dynamic constraints. Examples of `adaptive' or `smart structures' are abundant in `organic and biological systems' in nature. One of the problems in shape adaptation of flexible structures is active damping in which the objective is to suppress undesirable disturbances in the way of convergence to a desired shape. Principally, this task is achieved through the application of modal forces which are opposing unstable or undesirable motion of the structure. In this paper active damping of a beam as an example of flexible structures is studied. The purpose is to stabilize significant modes of motion with a piezoelectric actuator- sensor. Using a one dimensional partial differential equation model, a variational method is used to find a dissipative energy function. A criteria for the design of the shape of the piezoelectric material or electrode, which can accomplish damping of significant modes, is derived. Unlike previous efforts, which could find electrode shape for dissipativity of one mode, it is proven that the suggested shape guarantees the dissipativity of energy function for all modes of the system.

Paper Details

Date Published: 8 September 1993
PDF: 8 pages
Proc. SPIE 1917, Smart Structures and Materials 1993: Smart Structures and Intelligent Systems, (8 September 1993); doi: 10.1117/12.152755
Show Author Affiliations
Forouza Pourki, Drexel Univ. (United States)
Horacio Sosa, Drexel Univ. (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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