Distributed optical fiber monitoring method for surface expansion deformation of flexible buffer airbag

Abstract

The invention relates to a distributed optical fiber monitoring method for surface expansion deformation of a flexible buffer airbag. The method mainly comprises the following steps of 1, selecting atypical expansion section S to establish a coordinate system, and arranging an optical fiber grating sensing network; 2, establishing an X-direction deformation calculation model of the key discrete points on the axial cross section S; step 3, acquiring a key discrete point X-direction deformation value on the cross section SS after expansion deformation of the cross section S under different internal air pressures; 4, obtaining an X-direction deformation value of any position on the cross section SS; and 5, repeating the step 2 to the step 4 to obtain the Y-direction deformation value of anyposition on the cross section SS; and 6, obtaining the two-dimensional coordinates of any position on the cross section SS. According to the method, the response strain signals of the fiber bragg grating with a small number of discrete points are collected, and expansion deformation of the typical expansion cross section S on the surface of the flexible buffer airbag can be rapidly calculated through the finite element simulation and formula derivation.

Description

technical field [0001] The invention belongs to the field of structural health monitoring, and specifically proposes a distributed optical fiber monitoring method for surface expansion and deformation of a flexible buffer airbag. Background technique [0002] The flexible buffer airbag is a landing buffer device, which belongs to a new type of flexible inflatable structure. It has the characteristics of foldable, light weight, low cost, and good stretchability. As an energy attenuation system, it is widely used in aerospace recycling projects and airdrops of material equipment. Protection and personnel emergency protection and other fields. [0003] The stability, accuracy and reliability of the flexible buffer airbag structure in service are directly related to the service safety, efficiency and observation accuracy of aerospace structures. Real-time acquisition of the expansion and deformation of the flexible cushioning airbag structure under different internal air pressu...

AI Technical Summary

Problems solved by technology

The above algorithms mainly focus on the analysis of the deformation characteristics of rigid structures such as plates and wings, and do not involve real-time monitoring and calculation of the deformation state of flexible inflatable structures during service

In addition, the surface of the flexible cushioning airbag has an irregular arc-shaped structure. Under different internal pressures, the expansion and deformation of the surface of the bladder is nonlinear and the deformation is small. It is difficult to accurately capture the expansion of the surface of the bladder by non-contact measurement methods. Variety

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