Impact position judgment method based on full-band amplitude energy and inverse function solving

Abstract

The invention discloses an impact position judgment method based on full-band amplitude energy and inverse function solving, and belongs to the technical field of impact monitoring for structure health monitoring. The method comprises the following steps: 1, arranging distributed-type FBG (Fiber Bragg Grating) sensors; 2, carrying out the dividing of impact monitoring subregions; 3, selecting a sample impact point, and calculating the response frequency domain amplitude energy of the sample impact point; 4, obtaining a function relation which takes the response frequency domain amplitude energy of the sample impact point as an independent variable and takes the length of an impact point distance positioning sensor as a dependent variable through the inverse function solving; 5, calculating the frequency domain amplitude energy of response signals of to-be-detected impact points; 6, sequentially comparing the frequency domain amplitude energy of response signals of to-be-detected impact points, and determining the monitoring subregions where the to-be-detected impact points are located based on a regional binary search principle; 7, bringing the frequency domain amplitude energy of the to-be-detected impact points into a distance and response signal frequency domain amplitude energy relation, and determining the specific position coordinates of the to-be-detected impact points.

Description

technical field [0001] The invention relates to an impact location method based on full-frequency signal amplitude energy and inverse function solution, and belongs to the technical field of impact monitoring for structural health monitoring. Background technique [0002] Many modern large-scale structures such as aerospace vehicles, high-rise structures, new bridges, long-span grid structures, etc. will be subjected to design loads and various sudden external factors in complex service environments such as space junk, bird strikes, hail impacts, Artificial low-energy shocks during lightning strikes and maintenance, and the application of these shock loads may cause damage to the mechanical structure that cannot be visually inspected, such as matrix fracture, delamination, and perforation, which brings serious safety hazards to aerospace vehicles and reduces the number of aircraft. service life. Therefore, it is necessary to carry out safety testing for aerospace vehicles, ...

AI Technical Summary

Problems solved by technology

Due to the low sampling frequency of the fiber grating demodulator, most shock monitoring methods based on fiber gratings use neural network, support vector machine and other pattern recognition algorithms. Not only will it cause damage to the structure under test, but also there are problems such as poor generalization performance, easy to be affected by temperature changes, and large workload, which limits its practicability and real-time performance.

[0004] For this reason, in view of the low sampling frequency of the current shock monitoring system based on the fiber grating sensor and the situation that the high-resolution time information of the shock response cannot be obtained, the present invention proposes a four-sided fixed-support plate shock solution based on the inverse function of the amplitude energy in the frequency domain. Judgment method

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