Sound insulation design of vehicle side window glass based on acoustic black holes

Abstract

Acoustic black holes (ABHs) can reduce the mechanical vibration and radiated sound of a structure while simultaneously reducing its mass. By considering the practical application, a new vehicle side window glass is designed using ABH array to optimize its sound insulation performance in this paper. The finite element method (FEM) is used to analyze the response and modes of the glass to validate its ABH effect. The accuracy of the Finite Element-Stational Energy Analysis (FE-SEA) model is verified using Gaussian expansion method (GEM) and Statistical modal Energy distribution Analysis (SmEdA). Using the verified FE-SEA, the transmission loss (TL) of the new side window glass and the influence of the number of ABH layers are analyzed. It is observed that the overall TL of the new glass is better than that of the traditional one, which can highly improve the TL at the coincidence frequency and meanwhile reduce the weight. It provides a new technique to design vehicle glass to improve vehicle sound insulation performance.