Digital signal processing using MATLAB for damage identification using lamb waves
Keywords:
Guided waves Damage identification Bayesian inference Structural health monitoring Digital twinsAbstract
The use of guided waves as a method for locating damage has become increasingly popular in recent years due to the fact that it is dependable and can be carried out in a relatively short amount of time, in addition to the fact that it has the advantage of being able to inspect large areas as well as find subtle structural issues. Additional positive aspects of this technology include the following: A dispersed field is produced whenever a travelling wave on a plate has an interaction with a fault in the plate. The geometry of the flaw will affect the form of the dispersed field that it creates. One is able to as a result describe the kind of plate damage that has occurred.as the magnitude of the damage by analysing the dispersed field. It is the first time that a Bayesian framework that is based on an interaction model for guided waves has been developed for the purpose of damage detection of an infinite plate. In order to extract the scattering characteristics for damage geometries that have circular symmetry, a semi-analytical technique based on the lowest order plate theories is utilised. This leads to an efficient inversion process. After that, ultrasonic tests are carried out on a huge plate made of aluminium that has a circular depression in it.
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