Sound transmission loss of a novel acoustic metamaterial sandwich panel: Theory and experiment. (October 2022)

• Record Type: Journal Article
• Authors: Wang, Shuai; Zhang, Xuecong; Li, Fengming; Hosseini, Seyed Mahmoud
• Is Part Of: Applied acoustics. Volume 199(2022)
• Publication Date: 2022-10
• Subjects: Acoustic metamaterial sandwich panel -- Enhanced sound transmission loss -- Vibro-acoustic coupling -- Local resonator -- Acoustic experiment; Acoustical engineering -- Periodicals; Periodicals; 620.2
• DOI: 10.1016/j.apacoust.2022.109035
• Languages: English
• ISSNs: 0003-682X

Abstract

Highlights: A novel metamaterial sandwich panel with enhanced sound transmission loss is proposed. The space harmonic expansion method is applied to derive the dynamic equations. The effects of mass and loss factor of local resonator on the STL are analyzed. The results of experiment and FEM are compared with those of the theoretical ones. Abstract: A novel acoustic metamaterial (AMM) sandwich panel with enhanced sound transmission loss (STL) is proposed and designed by periodically distributing the local resonators in the stiffened core. The vibro-acoustic coupling is considered by the continuity of velocity at the fluid–structure interfaces. The effective dynamic mass density method is used to investigate the influences of the local resonators on the reinforced STL of the sandwich panel. The space harmonic expansion method and the virtual work principle are applied to derive the dynamic equations. An acoustic experiment is carried out and compared with the theoretical result. Experimental and theoretical results show that the STL curve has a peak near the objective frequency of the local resonator. The vibro-acoustic behaviors are further investigated using the finite element method (FEM). The peaks and dips in the STL curves are explained by the vibration modes and stress distributions obtained by the FEM. The proposed AMM sandwich panel possesses improved sound insulation performance around the mass-air-mass resonance frequency. For specific working conditions, the present method can be used to improve the STL of sandwich plates by adding resonators.