Abstract
We experimentally and theoretically investigate the band-gap and transmission properties of phononic crystal (PC) beams immersed in water. Spectral element method (SEM) is developed for theoretical analysis in which the hydrodynamic loading is taken into consideration. Influence of the hydrodynamic loading on band-gap and transmission properties of the PC beams are studied. To directly detect the displacement transmission of a fully or partially submerged PC beam, a fiber Bragg grating (FBG) displacement sensing system is set up. Agreement between the experimental results and theoretical/numerical calculations also indicates the excellent dynamic sensing performance of the FBG sensing system in the research of the fluid-structure interaction (FSI) problem. Obvious lowering of the band gaps due to fluid-solid coupling is clearly demonstrated. The results in this work might be useful in research such as active tuning of the band gap and transmission properties of the PCs through fluid-solid coupling.
Highlights
Phononic crystals (PCs) are periodic structures made up of two or more kinds of materials with different acoustic impedance [1,2,3]
Due to the well-screened core mode coupling, submerged fiber Bragg grating (FBG) are intrinsically insensitive to surrounding fluid and this makes the FBGs suitable candidates in sensing dynamic vibrations of submerged PCs
When the PC beam is partially immersed in water, the submerged part of the PC beam has larger effective density due to the added mass which decreases the pass bands and the band gaps
Summary
Phononic crystals (PCs) are periodic structures made up of two or more kinds of materials (solid-solid or fluid-solid) with different acoustic impedance [1,2,3] Due to their ability to forbid propagation of acoustic or elastic waves through band gaps induced by Bragg scattering or local resonance, PCs have received significant attention in the applications of wave manipulation, vibration suppression, wave guiding, and so on [4,5,6]. A wide range of research on FSI of non-periodic structures submerged in a fluid have laid a foundation for the study of the fluid-solid coupling on the PCs, vibration characteristics of slender beams subjected to hydrodynamic loadings. To the authors’ best knowledge, this is the first experimental study on FSI of the PC beam using the point-wise FBG displacement sensing technique
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