Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
"Symmetrical Damage Detection in Beam Structures using Wave Propagation and Piezoelectric Sensors: A Theoretical Study"
Submission Author:
Pedro Christian Ayala Castillo , PA , Brazil
Co-Authors:
Pedro Christian Ayala Castillo, Michael Brennan
Presenter: Pedro Christian Ayala Castillo
doi://10.26678/ABCM.COBEM2023.COB2023-2316
Abstract
Structural Health Monitoring (SHM) has gained significant attention for early detection of damage in structures through wave propagation research. This paper presents a theoretical study of wave propagation for the purpose of detecting and quantifying damage in beam structures, with a specific focus on the interaction of waves with symmetrical damage relative to the neutral axis. An analysis of a one-dimensional structural waveguide with a piezoelectric actuator and sensors in pitch-catch and pulse-echo configurations is presented. The model is developed in the frequency domain and transformed into the time domain using the inverse Fourier transform, allowing investigation of the effect of damage on wave propagation in both domains. The size of the actuator, sensor, and damage is studied for a thin aluminum beam. Results show that the time-domain approach is preferable over a frequency-domain approach for damage detection in this type of structure. Longitudinal waves are found to be more sensitive to changes in thickness for symmetrical systems, and measuring reflected waves is more effective than transmitted waves. The findings also reveal that the dispersive nature of bending waves can result in decreased reflected wave amplitude with reduced beam thickness in certain situations.
Keywords
wave propagation, Damage Detection, Structural Health Monitoring (SHM)
