Propagation Band Gap Characteristics of Open Ring-Like Phononic Crystal

Abstract

Abstract: In order to attenuate the mid- and low-frequency vibration noise, a non-strictly symmetrical open ring-like phononic crystal structure was designed. Based on the finite element method and elastic wave theory, its band gap characteristics and vibration attenuation performance in various directions were analyzed; Combined with the vibration mode of the system, the reasons for the opening and closing of the band gap were explained, and the influence of geometric parameters on the band gap width was analyzed. The results show that due to the non-strict symmetry of the crystal, only the transmission loss in the ΓX direction is consistent with the band gap characteristics, and the attenuation performance is better than that in the MΓ direction. The average attenuation in the band gap is 27.8 dB, which is 5.5 dB higher than that in the MΓ direction. There is almost no displacement deformation in the forbidden band, and the deformation of the pass band significantly increases due to the inability to suppress the propagation of elastic waves; the horizontal and rotational movement of the core is an obvious sign of the beginning and end of the band gap. With tungsten as the core, the starting frequency and bandwidth are 500 Hz. Increasing the material density, filling rate and lattice size of the core will help to obtain a complete band gap at lower frequencies.

Key words: ring-like phononic crystal, band gap structure, directional transmission loss, geometric size, vibration attenuation performance

CLC Number:

O735

TANG Rongjiang, PAN Chaoyuan, ZHENG Weiguang, HE Hongbin, TANG Jingtian. Propagation Band Gap Characteristics of Open Ring-Like Phononic Crystal[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(3): 428-434.

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