ANALYSIS OF BRIDGE VIBRATION, USING FIBER-OPTIC BRAGG SENSORS WITH TILTED GRATING

Abstract

An article herein presents methodology of identification and analysis of selected dynamic characteristics of bridge construction displacement, applying fiber-optic Bragg sensors with tilted grating. In the work herein there is described the main principle of sensors operation, based on fiber Bragg grating. As well, there have been defined vibration regimes, using analysis of time series with high discretization frequency. By means of corresponding mathematical models (filters) and spectral analysis there have been revealed and described construction’s vibration frequencies, which have been compared with theoretical model, being described by dynamic bridge behavior.  The given model has been checked at automobile and pedestrian bridge. By means of developed mathematical and experimental model there has been processed the data and defined vibration regimes upon bridge construction vibration.