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Proceedings Paper

Strain mapping using piezoelectric sensors for damping treatment applications
Author(s): Douglas A. Henderson
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Paper Abstract

A concept for measuring dynamic strain distributions on structural surfaces is presented. The concept uses an array of small piezoelectric polymer film -- polyvinylidene fluoride (PVDF) -- strain sensors coupled with an inexpensive multi-channel signal processor to produce strain `maps.' The strain `maps' are intended to aid the placement of damping treatments. The current approach is to measure displacement mode shapes, measurement of the strain shapes is a more direct approach. As the structure bends, the PVDF sensor produces a voltage proportional to the dynamic strain over the effective surface area. The concept was first applied to an aluminum beam. An array of PVDF sensors was bonded to the surface of the beam to produce strain `maps' for the first three vibration modes. The resonant frequencies, damping, and strain `maps' were identified from captured transient time domain responses of the beam using the Eigensystem Realization Algorithm and compared to the parameters predicted by a finite element model. This paper compares the experimental and analytical strain `maps' of the beam and discusses the techniques required to conduct the experiment. Results presented in the paper show reasonably accurate strain `maps' which allowed the modal strain to be directly measured.

Paper Details

Date Published: 5 May 1995
PDF: 9 pages
Proc. SPIE 2445, Smart Structures and Materials 1995: Passive Damping, (5 May 1995); doi: 10.1117/12.208910
Show Author Affiliations
Douglas A. Henderson, Air Force Wright Lab. (United States)

Published in SPIE Proceedings Vol. 2445:
Smart Structures and Materials 1995: Passive Damping
Conor D. Johnson, Editor(s)

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