Transmission in Two-Element Quasi One-Dimensional Acoustic Barriers |
| S. Garus, J. Garus, W. Sochacki
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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| The study analyzed the mechanical wave transmission for a source with a sound pressure level of 90 dB through all possible distributions of a finite multilayer structure made of air and polylactic acid. The structure was surrounded by air. The influence of thickness and spatial distribution of layers on the shifts of transmission peaks and the reduction of its value are presented. The analyzed structures showed the existence of bandgaps, i.e., wave frequencies, where, due to destructive interference, no propagation through the structure occurs. The transmission was determined using the transfer matrix method algorithm. |
DOI:10.12693/APhysPolA.142.92 topics: acoustic barriers, transfer matrix method, phononic band gap, multilayers |