Strain-displacement mapping for a precision truss using Bragg gratings and identified mode shapes

Albert Bosse; George C. Kirby III; David G. Bellemore; Alan D. Kersey; Tsung-Ein Tsai; E. Joseph Friebele

doi:10.1117/12.239037

1 May 1996 Strain-displacement mapping for a precision truss using Bragg gratings and identified mode shapes

Albert Bosse, George C. Kirby III, David G. Bellemore, Alan D. Kersey, Tsung-Ein Tsai, E. Joseph Friebele

Proceedings Volume 2717, Smart Structures and Materials 1996: Smart Structures and Integrated Systems; (1996) https://doi.org/10.1117/12.239037
Event: 1996 Symposium on Smart Structures and Materials, 1996, San Diego, CA, United States

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.

Citation Download Citation

Albert Bosse, George C. Kirby III, David G. Bellemore, Alan D. Kersey, Tsung-Ein Tsai, and E. Joseph Friebele "Strain-displacement mapping for a precision truss using Bragg gratings and identified mode shapes", Proc. SPIE 2717, Smart Structures and Materials 1996: Smart Structures and Integrated Systems, (1 May 1996); https://doi.org/10.1117/12.239037

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