Fundamental study of mechanism of band gap in fluid and solid/fluid phononic crystals. (July 2018)

• Record Type: Journal Article
• Authors: Li, Eric; He, ZC; Wang, G; Jong, Yong
• Is Part Of: Advances in engineering software. Volume 121(2018)
• Page Start: 167
• Page End: 177
• Publication Date: 2018-07
• Subjects: Phononic crystal -- Band gap -- Fluid-structural interaction -- Transmission loss; Computer-aided engineering -- Periodicals; Engineering -- Computer programs -- Periodicals; Engineering -- Software -- Periodicals; Periodicals; 620.0028553
• DOI: 10.1016/j.advengsoft.2018.04.014
• Languages: English
• ISSNs: 0965-9978

Abstract

Highlights: The mechanism of the generation of the band gap in fluid and solid/fluid PCs is studied. The low-frequency band gaps can be obtained by introducing the local resonant inclusion. The solid/fluids PCs with consideration of FSI can block the propagation of stress wave effectively. Abstract: Phononic crystals (PCs) have possessed outstanding features to control/manipulate the propagation of the acoustic/sound wave. In this paper, the local resonant elements, such as local resonant cavity in fluid PCs and local resonant inclusion in solid/fluid PCs, are introduced. The effect of geometry parameters, Poisson's ratio, Young's modulus on the band gap solid/fluid PCs are investigated in detail. It is found that wider multiple band gaps are obtained for the fluid PCs with local resonant cavity of "+" hole compared with square and circle holes. More importantly, the very low-frequency band gaps can be obtained by introducing the local resonant inclusion with consideration of fluid-structural interaction for solid/fluid PCs. In addition, we have compared the sound transmission loss in fluid and solid/fluid PCs. The numerical results have clearly indicated that solid/fluids PCs with consideration of fluid-structural interaction can block the propagation of stress wave effectively compared with fluid PCs. The theoretical study and numerical simulation conducted in this work have provided a new avenue to design more innovative fluid and solid/fluid PCs.