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Estimation of Dynamic Displacement and Characteristics of A Simple Beam from FBG Sensor Signals  

Choi, Eun Soo (한국철도기술연구원)
Kang, Dong Hoon (한국철도기술연구원)
Chung, Won Seok (한국철도기술연구원)
Kim, Hak Soo (호남대학교 토목공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.18, no.4, 2006 , pp. 503-514 More about this Journal
Abstract
FBG sensors are capable of measuring the strain of structures easily and more durably than electric resistance gauges. Thus, many researches are dedicated to the application for the response monitoring or non-destructive evaluation of structures using FBG sensors. Additionally, the measured strains at the top and bottom of a cross-section can be transformed into the curvature of the section, which can be used to calculate its vertical displacement. Hence, this study aims to measure the dynamic strain signals of a steel section simply supported beam and to estimate the dynamic displacement from the strain signals, after which the estimated displacement is com pared with the measured displacement. The dynamic characteristics (natural frequency, damping ratio and mode shape) of the beam are predicted from both the estimated and measured displacement signals, and from the strain time history of the FBG sensors. The predicted properties are compared with those of an analytical model of the beam. The estimated displacement. However, the predicted dynamic properties from both the estimated displacements and the measured strains are well-correlated with those from the measured displacement. It is therefore appreciated that the estimation of the dynamic properties of FBG sensor signals is reasonable. Especially, the strain signal of the FBG sensor was amplified at a higher-frequency region in comparison with the displacement estimation with higher-mode properties.
Keywords
FBG sensor; strain; curvature; estimated displacement; dynamic properties;
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