A novel plate-type phononic crystal for efficient vibration and noise attenuation performance

TL;DR

This paper introduces a new plate-type phononic crystal design that effectively attenuates low-frequency vibration and noise by leveraging local resonance, with tunable bandgap properties verified through finite element simulations.

Contribution

The study presents a novel plate-type phononic crystal structure with adjustable low-frequency bandgaps for vibration and noise control, analyzed via finite element method.

Findings

Single-sided PC has narrower bandgap than double-sided

Bandgap width and position are tunable by structural parameters

Simulations confirm effective vibration and noise attenuation

Abstract

Mitigating low-frequency vibration or noise is of vital importance to both human health and mechanical engineering. Two-dimensional phononic crystal (PC) structures were proposed by attaching rubber and metallic cylinders on one or both sides of a thin plate to attenuate low-frequency vibration via the local resonance mechanism. The finite element method was employed to evaluate the band structure and associated vibration modes of the proposed PC structures. It was found that the bandgap of the single-sided PC structure is narrower than that of the double-sided configuration. The formation mechanism of the flexural wave bandgap was analyzed based on the vibration modes. In particular, the influence of structural and material parameters on the band structure was systematically investigated. Finally, the accuracy of the calculated band structure and the effectiveness of the vibration and noise reduction performance were verified through simulations of vibration transmission characteristics and sound insulation curves. The results indicate that the proposed PC generates a relatively wide flexural wave bandgap in the low-frequency range, whose width and position can be flexibly tuned by adjusting structural and material parameters. These findings provide a novel approach for controlling low-frequency vibration and noise.