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Proceedings Paper

Vibratory signature of electric pylons under impulse testing
Author(s): Jean-Jacques Thomas; Minh Phong Luong; Jean-Francois Semblat
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Paper Abstract

A nondestructive vibratory technique has been used to record the vibratory signature of electric pylons. It evidences the principal modes of vibrations. The vibration magnitude depends on the impact location and the loading amplitude. The appearance of energy dissipation mechanisms, corresponding to a damaging process, is readily detected by a change of characteristics of the recorded acceleration signals. A method based on Volterra series provides a ready mean to analyze the nonlinear response and permits us to monitor the durability of the pylon in service. The presented technique relies on the evaluation of a scalar called `nonlinear contrast,' indicating the significance of nonlinear behavior of the structure under impact loading, in comparison with a reference state. The calculation requires the identification of Volterra kernels through a multi-amplitude procedure. The fact that an unscrewed bolt has been evidenced shows that this technique is very sensitive. The second major experimental result is that the nonlinear contrast appears to be independent on the accelerometer location and direction.

Paper Details

Date Published: 20 April 1995
PDF: 10 pages
Proc. SPIE 2446, Smart Structures and Materials 1995: Smart Systems for Bridges, Structures, and Highways, (20 April 1995); doi: 10.1117/12.207734
Show Author Affiliations
Jean-Jacques Thomas, Ecole Polytechnique (France)
Minh Phong Luong, Ecole Polytechnique (France)
Jean-Francois Semblat, Lab. Central des Ponts et Chaussees (France)

Published in SPIE Proceedings Vol. 2446:
Smart Structures and Materials 1995: Smart Systems for Bridges, Structures, and Highways
Larryl K. Matthews, Editor(s)

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