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Proceedings Paper

Strain-displacement mapping for a precision truss using Bragg gratings and identified mode shapes
Author(s): Albert Bosse; George C. Kirby III; David G. Bellemore; Alan D. Kersey; Tsung-Ein Tsai; E. Joseph Friebele
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Paper Abstract

A procedure for mapping strain measurements to nodal displacements for a 3.74 meter laboratory truss is presented and validated using experimental data. Assumptions of small displacements and a linear displacement-strain relationship were used to develop the strain- displacement mapping. Due to the assumed discrete nature of the space truss structure, the transformation depends only on kinematics and hence only geometric data is required for the mapping. The procedure is therefore valid for quasi-static deformations as well as dynamic deformations. Estimated displacements for several nodes are compared with truth measurements obtained from both a laser interferometer system and accelerometers. It is shown that the accuracy of the predicted displacement for a limited number of sensor depends not only upon the deformation state but also which degree of freedom is being estimated.

Paper Details

Date Published: 1 May 1996
PDF: 9 pages
Proc. SPIE 2717, Smart Structures and Materials 1996: Smart Structures and Integrated Systems, (1 May 1996); doi: 10.1117/12.239037
Show Author Affiliations
Albert Bosse, Naval Research Lab. (United States)
George C. Kirby III, Naval Research Lab. (United States)
David G. Bellemore, Naval Research Lab. (United States)
Alan D. Kersey, Naval Research Lab. (United States)
Tsung-Ein Tsai, Naval Research Lab. (United States)
E. Joseph Friebele, Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 2717:
Smart Structures and Materials 1996: Smart Structures and Integrated Systems
Inderjit Chopra, Editor(s)

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