METHOD AND SYSTEM FOR STRUCTURAL HEALTH MONITORING WITH FREQUENCY SYNCHRONIZATION

摘要

Structural health monitoring (“SHM”) methods, apparatus and techniques involve building deformation fields maps (amplitude and phase related to excitation) on the surface of the structural component under monitoring based on a network of strain measurements by fiber Bragg grating sensors.

主权项

1. A method for the structural health monitoring (SHM) of a structural component, comprising:
a) exciting the at least one actuator using CW (continuous wave) across a predetermined frequency range to excite the structural component, so as to generate a dynamic deformation field, with sinusoidally defined variation at the same frequency of the potential difference imposed on plural fiber Bragg grating (FBG) sensors distributed in a network of FBG sensors attached to the surface of the structural component, thereby synchronizing actuation with detection to obtain in-phase and out-of-phase measurement resolution for strain measurements using the plural fiber Bragg gratings; b) using the plural sensors to measure the deformation field; b) filtering the measurement of the deformation field to select only that portion of the deformation field associated with the sinusoidal actuation generated by the actuator; c) in response at least in part on the filtered measurement of the deformation field, generating a two-dimensional map indicating the amplitudes and phases of the surface strains, said map being based on the amplitude and on the phase of the plural sensors; d) repeating the procedure for multiple frequencies; e) comparing the two-dimensional maps obtained by the different frequencies for the detection of structural damage; and f) performing computational analysis of the so-obtained two-dimensional field deformation maps with the aid of pattern recognition methods in order to identify structural damage.