Structure deformation fiber monitoring-reconstructing method and system

Abstract

The invention relates to a structure deformation fiber monitoring-reconstructing method and system. Strain and deformation data is extracted according to a finite element simulation result of a structure, a strain-deformation function relation of multiple lines is fit on the basis of the idea of least squares, and an initial integral deformation field of the structure is obtained by interpolation.A fiber monitoring system is established, strain, temperature and acceleration data of the structure is collected, a strain sequence is reconstructed via an interpolation algorithm according to discrete point data measured by experiments, the strain-deformation function relation is corrected, and further the integral deformation field of the structure is corrected. The system and method are verified in a rectangular plate deformation reconstruction experiment, the deformation state of a tested piece can be obtained effectively via the system and method, the deformation field is reconstructedfor about 2%, and a simulation error is reduced greatly compared with a finite element.

Description

technical field [0001] The invention relates to a structural deformation optical fiber monitoring and reconstruction method and system, belonging to the technical field of gas flow testing. Background technique [0002] With the development of spacecraft, the health status of the spacecraft structure has attracted more and more attention. The deformation of key structures will affect the load and system index performance in the slightest, and cause structural damage and loss of system functions in severe cases, and even the safety of personnel. , it is urgent to obtain the structural deformation state to evaluate the structural health state in time. Due to the particularity of the spacecraft's use environment and the complexity of the structural deformation state, the non-contact deformation monitoring technology based on optical imaging is affected by the optical path layout and body vibration, making the non-contact measurement deformation monitoring technology in the appl...

AI Technical Summary

Problems solved by technology

[0003] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, the present invention proposes a method of using fiber gratings to monitor the temperature, vibration and strain of structures, and constructing structural deformations based on limited monitoring data, deformation coordination relations of structural materials and numerical algorithms , to realize the deformation reconstruction under the service state of the structure, and solve the problems of insufficient measurement accuracy of the existing technology, the inability to adapt to the working environment of the on-orbit aircraft, and the inability to accurately establish the relationship between the measured and the deformation.

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