Recently, sandwich structures have been widely used in different field because of their good mechanical properties but these structures are slightly insufficient in acoustic performance. In this paper, by combining the pyramidal truss core sandwich structure with membrane-type metamaterials, a new structure is proposed with both good mechanical properties and excellent acoustic performance at low frequency. An analytical model of the membrane-type metamaterials combined with the pyramidal truss core sandwich structure is developed to investigate the sound transmission loss (STL) performance of the structure. Finite element method (FEM) is also used to investigate the STL performance at low frequency. The effects of the additional block on the membrane, the tension of the membrane, the incident wave angle and the geometrical size of the structure to the STL of the structure are discussed.
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