Experimental Study on Sound Absorption of Triply Periodic Minimal Surface With Porous Fillings

Triply Periodic Minimal Surface (TPMS) structures have been widely applied in engineering fields due to their characteristic. In recent years, they have also become a research focus in the field of sound absorption and noise reduction. However, existing studies have shown that the sound absorption performance of a single TPMS structure is limited, making it difficult to meet the noise reduction requirements for higher performance. To improve the acoustic performance of TPMS-based materials, this study proposes filling the TPMS framework with fine-pore foams and aerogel particles to construct multi-scale porous composite structures. First, the TPMS framework was fabricated via 3D printing, and a directional constraint process was adopted to achieve uniform filling of the foam in the structural cavity, resulting in the preparation of the TPMS-foam composite material. Second, a pressure-assisted seepage process was used to prepare the TPMS composite structure filled with aerogel particles. The accumulation of particles forms a multi-scale coupled pore structure. Experiments demonstrate that the sound absorption performance of both composite structures has been improved over a wide frequency range. This study provides a new design approach and multi-dimensional regulation strategy for the application of TPMS structures in the field of high-performance sound absorption.