Non destructive testing using non linear vibroacoustic
Résumé
Several recent experimental studies show that it is possible to detect defects in a structure by considering its vibro-acoustic response to an external actuation. On this topic there is a vast literature in applied physics. We recall some papers related to the use of the frequency response for non destructive testing; in particular generation of higher harmonics, cross-modulation of a high frequency by a low frequency: We intend to present simple spring mass models, simple bar and beam models with damage and use asymptotic expansions and numerical methods to try to get results which show some similarity with the experiments. Asymptotic expansions have been used for at least a century and for example has been used recently for numerical approximation of bifurcation of structures in Potier Ferry-Cochelin and coworkers. The key idea is to look at the solution in the frequency domain for the experiments and consequently for the numerics.
Domaines
Mécanique [physics]
Origine : Fichiers produits par l'(les) auteur(s)
Loading...