Effects of Microcavity Local Resonators on the Bandgap Characteristics of a Two-Dimensional Phononic Crystal Structure
Advances in Applied Sciences
Volume 4, Issue 5, October 2019, Pages: 97-103
Received: Oct. 5, 2019;
Accepted: Oct. 25, 2019;
Published: Nov. 8, 2019
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Randy Amuaku, Koforidua Technical University, Faculty of Engineering, Koforidua, Ghana
Wen Huabing, Jiangsu University of Science and Technology, School of Energy and Power, Zhenjiang, China
Eric Amoah Asante, Koforidua Technical University, Faculty of Engineering, Koforidua, Ghana
Augustus Buckman, Jiangsu University of Science and Technology, School of Energy and Power, Zhenjiang, China
The emergence of acoustic metamaterials generated a lot of attention in the study of low-frequency vibration, noise control and reduction in engineering applications. As a result, the elastic wave bandgap characteristics of a two-dimensional microcavity local resonator structure for two soft rubber materials was investigated using finite element methods (FEM). The transmission spectrum of the displacement eigenmodes of the bandgap edges relating to the lowest bandgap was calculated. The results showed that the phononic crystal structure without a microcavity local resonator plate has bandgap characteristics of elastic wave propagation in the high-frequency range between 2200~2400Hz. However, with the introduction of microcavity resonator plates in the phononic crystal structure low-frequency bandgaps are obtained in the region of 0~198Hz and 0~200Hz respectively. The low-frequency bandgaps appeared as a result of the microcavity local resonator plate which increased the path length through which the wave is transmitted. The phononic crystal microcavity local resonator plate structure has varying transmission loss characteristics of -65dB, -85dB, -100dB and -150dB in the low-frequency range depending on the number of local resonator plates introduced into the cell structure and density of the cell structure. The study provided a good demonstration of wave propagation in artificially engineered materials with critical emphasis on the effects of local resonators in a microcavity structure.
Eric Amoah Asante,
Effects of Microcavity Local Resonators on the Bandgap Characteristics of a Two-Dimensional Phononic Crystal Structure, Advances in Applied Sciences.
Vol. 4, No. 5,
2019, pp. 97-103.
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