Sound insulation performance of Mi-shaped mass membrane-honeycomb structure acoustic metamaterials

With the continuous improvement in the requirements for the sound and vibration performance of ships, sound insulation materials should not only be lightweight but also have excellent sound insulation performance. Based on the light weight of the sandwich panel structure and the good low-frequency sound insulation performance of the membrane-type acoustic metamaterial structure, a new membrane-type metamaterial honeycomb sandwich panel structure is designed in this paper. The sound insulation properties of metamaterial structures with different masses are analysed by numerical methods, and the influence of the size of the mass on the sound insulation properties of metamaterial structures is discussed. The sound insulation performance of the circular and mi-shaped mass membrane-honeycomb structures was compared through model experiments, and the sound insulation performance of different core heights and double-layer membrane metamaterial structures was experimentally studied. The experimental results show that the metamaterial structure designed in this paper has excellent low-frequency broadband sound insulation performance.