A Deformation Measurement Method of Large Structures Based on Fiber Bragg Grating Sensing Network

Abstract

The invention provides a fiber bragg grating sensor network based large-scale structure body deformation measurement method which aims to detect the condition of deformation of a large-scale structure body which is stressed by an external force or an internal force and real-timely monitors health conditions of the large-scale structure body. The fiber bragg grating sensor network based large-scale structure body deformation measurement method includes arranging a fiber bragg grating sensor network on a structure body to be detected, using a fiber bragg grating strain sensor to detect strain borne by the structure body, using a fiber bragg grating temperature sensor as temperature compensation of the strain sensor, interpolating detected disperse strain data into polynomials, performing twice integration, and bringing in initial conditions to obtain a deformation curve of the structure body. The fiber bragg grating sensor network based large-scale structure body deformation measurement method is mainly used for monitoring health conditions of the large-scale structure body and is suitable for large-scale networking; compared with traditional resistance strain gages for measuring strain of the structure body, the fiber bragg grating sensor network based large-scale structure body deformation measurement method has the advantages that defects that resistance strain gages are difficult to network and prone to be interfered by electromagnets and many shield cables are heavy are overcome.

Description

technical field [0001] The invention belongs to the field of structural health monitoring, in particular to a method for measuring deformation of a large structure based on a fiber grating sensor network. Background technique [0002] With the continuous development of aircraft and spacecraft, large-scale, complex and functional gradually become the inevitable trend of the development of modern engineering structures, which makes the service environment of the structure itself increasingly complex, and the damage forms of the structure itself are constantly diverse. Due to impact, vibration, The problem of structural damage caused by factors such as extreme environments has also become increasingly prominent. For large-scale engineering structures, the main damage types such as internal cracks in the structure, internal fractures in composite materials, and corrosion of metal structures have the characteristics of strong concealment of damage, complex structural failure mech...

AI Technical Summary

Problems solved by technology

For large-scale engineering structures, the main damage types such as internal cracks in the structure, internal fractures in composite materials, and corrosion of metal structures have the characteristics of strong concealment of damage, complex structural failure mechanisms caused by damage, and difficulty in judging the degree of structural damage caused by damage.

These characteristics greatly reduce the reliability of the structure during service. If no corresponding remedial measures are taken in this case, damage accumulation will be formed inside the structure, which will promote the sudden failure of the whole or partial structure, resulting in huge property damage and personal injury

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