Sound Insulation Mechanisms and Behavior of Lightweight Metamaterial Plate

doi:10.3901/JME.2023.15.094

Abstract

Abstract: Sound insulation of a lightweight metamaterial plate structure composed of a thin host plate with periodically attached strip mass blocks is studied. To efficiently predict the sound insulation performance, a semi-analytical method based on fast retrieving of dynamic effective surface mass density is established by using a pure structural finite element modeling. The effectiveness of the semi-analytical method under different incident sound field conditions is verified by experimental test of large-scale specimens. Our predictions and measurements both demonstrated that the metamaterial plate can break the mass law, achieving very high sound transmission loss (STL) in the low frequency range. Furthermore, by analyzing the dynamic effective mass density of the metamaterial plate structure and the vibration deformation field of the host plate, the mechanisms of low-frequency sound insulation were revealed. Moreover, by fixing the static surface mass density of the metamaterial plate, the effects of various material/structure parameters of metamaterial plate structure on the properties of the low-frequency sound insulation ware examined. The results suggested that by jointly adjusting multi-parameters, the low-frequency bandwidth can be significantly broadened in the premise of the STL peak frequency unchanged. The work provides guidelines for the low-frequency and broadband sound insulation design of the metamaterial plate structure.

Key words: metamaterial plate, sound insulation, low-frequency, sound transmission loss

CLC Number:

TB535

WANG Shuaixing, XIAO Yong, TANG Yanning, WU Jian, TENG Wanxiu, WEN Jihong. Sound Insulation Mechanisms and Behavior of Lightweight Metamaterial Plate[J]. Journal of Mechanical Engineering, 2023, 59(15): 94-109.

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