Influence of the Number of Meta-Atom Layers on the Occurrence of Local Resonances in Phononic Structures
S. Garus
Department of Mechanics and Fundamentals of Machinery Design, Faculty of Mechanical Engineering and Computer Science, Czestochowa University of Technology, Dąbrowskiego 73, 42-201 Częstochowa, Poland
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In order to investigate the effect of the number of meta-atomic layers on the propagation of the mechanical wave, studies on the propagation of the Gaussian impulse in structures with from one to five five-atomic layers in the phononic structure were carried out. The structure consisted of square-section meta-atoms made of polylactic acid. Wave propagation was analyzed using the finite difference time domain and fast Fourier transform algorithms. The conducted research showed the appearance of local resonance fields in the inter-meta-atomic space, resulting from the phenomena of diffraction and interference, which reduced the speed of wave propagation in the structure and caused the occurrence of gaps in the analyzed quasi-two-dimensional structures.

DOI:10.12693/APhysPolA.142.124
topics: acoustic barriers, FDTD, fast Fourier transform (FFT), local resonance