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COBEM 2021
26th International Congress of Mechanical Engineering
On the Frequencies for Structural Health Monitoring in Plates with Symmetrical Damage: An Analytical Approach
Submission Author:
Kayc Lopes , SP
Co-Authors:
Kayc Lopes, Camila Gianini Gonsalez Bueno, Daniel Inman, Douglas Bueno
Presenter: Kayc Lopes
doi://10.26678/ABCM.COBEM2021.COB2021-2325
Abstract
Detecting incipient damage in structures is an important challenge for the engineering community. The design of structural health monitoring (SHM) systems usually involves selection of actuators and sensors, defining their positions on the structure and post-processing output signals. This article presents an approach to determine the optimal frequencies for damage detection in plates considering perpendicular incidence of longitudinal waves incoming in the damage. At these optimal frequencies are observed the maximum reflected and the minimum transmitted longitudinal wave amplitudes. Two damage detection indexes are introduced and if they are computed for the optimal frequencies it is possible to determine the damage depth. It is demonstrated that pulse-echo configuration is more convenient for damage detection because it involves higher wave amplitudes variation than the pitch-catch configuration. Numerical simulations are carried out by considering an aluminum plate, and the results show that the approach contributes to establish more efficient SHM systems.
Keywords
Plates, Symmetrical Damage, Optimal Frequencies, longitudinal waves
