Nonlinear vibration-FBG sensing technique for plate detection

Abstract

Purpose

This paper aims to put forward a nonlinear vibration method for crack detection based on fiber Bragg grating (FBG), which is used to receive the waves in the plate.

Design/methodology/approach

First of all, measuring principle of nonlinear vibration technique and FBG sensing principle are introduced. Then nonlinear signal spectrum is analyzed to reveal various models of nonlinear vibration, and modal analysis of the plate structure is performed to lay the foundation for the later experiment. This approach is the cross-modulation effect from a persistent excitation to the receipt signal.

Findings

The experimental system is built and its results are in agreement with theoretical analysis, and show that this nonlinear vibration method based on FBG sensor is sensitive to crack damage.

Originality/value

Taking the board structure as the object, a new attempt by nonlinear vibration detection with FBG sensor has been investigated.

Citation

Cai, L., Tan, Y. and Wei, Q. (2015), "Nonlinear vibration-FBG sensing technique for plate detection", Sensor Review, Vol. 35 No. 3, pp. 287-295. https://doi.org/10.1108/SR-09-2014-0704