Session: 01-06-02: New Advances in Acoustics and Vibration: AI and Machine Learning, New Methods and Materials

Paper Number: 145436

145436 - Experimental and Numerical Investigation of Elastic Wave Trapping in a Two-Dimensional Axisymmetric Plate 

The rainbow trapping effect, involving progressively slowing group velocity in space and exhibiting spatially variant dispersion characteristics, has been demonstrated in both acoustic waves and electromagnetic fields. Although its usefulness has been established in one-dimensional studies, the effect has rarely been studied in a two-dimensional scenario, which possesses higher relevance to engineering structures. Within the scope of this research, the rainbow trapping effect is numerically substantiated using the finite element method based on a two-dimensional axisymmetric phononic crystal plate, and measurements are taken with a single-point laser Doppler vibrometer to confirm the concept. The results validate the existence of elastic waves with frequencies ranging from 165 kHz to 205 kHz, which become confined at distinct radial distances within the plate, validating the proposed approach. Additionally, the results not only substantiate the efficacy of the methodology but also underscore its versatility across a wide frequency spectrum. This versatility extends its applicability to diverse scenarios, such as filtering of waves at various locations within complex structural frameworks. In essence, our study opens avenues for further exploration and practical applications within engineering domains.

Presenting Author: Ali Zabihi Rowan University

Presenting Author Biography: My name is Ali Zabihi, and I am a Ph.D candidate at Rowan University in the Department of Mechanical Engineering. My research interests include structural health monitoring, noise and vibration, and acoustic metamaterials, micro and nanoelectro mechanical systems (MEMS/NEMS) and mathematical physics.

Authors:

Ali Zabihi Rowan University
Chadi Ellouzi Rowan University
Louis Gormley Rowan University
Farhood Aghdasi Rowan University
Katerina Stojanoska Rowan University
Amir Miri New Jersey Institute of Technology
Ratneshwar Jha Florida Institute of Technology
Chen Shen Rowan University