Method and system for damage location of composite beam structures based on discrete wavelet

Abstract

The invention relates to a damage positioning method of a composite-material beam structure on the basis of discrete wavelets. The damage positioning method comprises the following steps: acquiring a first-order modal shape of the composite-material beam structure; decomposing the first-order modal shape by using the discrete wavelets to acquire all detailed wave forms under 1-3 scale; solving envelope signals of all the detailed wave forms and carrying out statistics on the number of highest points of all envelopes; and judging whether the damage occurs according to the number of the highest points of the envelope signals at the same physical position. Based on the method, a damage positioning system of the composite-material beam structure on the basis of the discrete wavelets is realized so as to bring convenience for application of the method. The damage positioning method and the damage positioning system have the characteristics of fast operation efficiency and high damage recognition and are applicable to dynamic nondestructive detection of the composite-material beam structure.

Description

technical field [0001] The disclosure relates to the field of structural dynamics non-destructive testing, in particular, to a discrete wavelet-based damage location method and system for a composite beam structure, which utilizes modal testing for damage location of a composite beam structure. Background technique [0002] Composite material beam structures are affected by various loads during long-term service, and are prone to produce and accumulate microscopic damages. Eventually, the accumulation of microscopic damages will gradually evolve into macroscopic damages that endanger the safety of the entire structure. In recent decades, structural dynamics Nondestructive testing has been developed rapidly, but the damage localization of composite beam structures using discrete wavelets has not been reported. Contents of the invention [0003] In view of some of the above problems, the present disclosure provides a method and system for locating damage of a composite mater...

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Problems solved by technology

[0002] Composite material beam structures are affected by various loads during long-term service, and it is easy to generate and accumulate micro damages. Eventually, the accumulation of micro damages will gradually evolve into macro damages that endanger the safety of the entire structure. In recent decades, structural dynamics Nondestructive testing has been developed rapidly, but the damage localization of composite beam structures using discrete wavelets has not been reported yet.

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