Sound Insulation Analysis for High Performance Double Walls Included Thin-Film Cells

Abstract

We report the effect of acoustic transmission loss of double-walled structure including thin film cells by film height. The experiment showed that this double wall structure has higher sound insulation performance than the hollow double wall. The sound transmission loss of the high performance double wall structure with different film heights was calculated by numerical analysis using finite element method (FEM) and transfer matrix method (TMM). The rigidity of the thin film closed space structure decreased as the height increased, and the sound transmission loss increased in the high frequency region of the high film height model.