Polymeric cellular structures based on triply periodic minimal surfaces (TPMS) have been widely studied for applications in multiple disciplines due to their multifunctionality. However, there is limited acoustic application by TPMS-based structures as their acoustic properties remain largely unknown. In this paper, TPMS-based structures are fabricated by additive manufacturing and investigated as a novel solution to sound absorption in the upper midrange frequency. Structures based on three typical surface types (Primitive, Gyroid and Diamond) with three geometry-related parameters (volume fraction, unit cell size and height) are manufactured by stereolithography and tested by two-microphone impedance method in the frequency range of 2000-6000 Hz. The results show that the structures based on Diamond surfaces exhibit excellent absorption abilities among the three types in a wide bandwidth. High absorption coefficients can be achieved by a large volume fraction or a small unit cell size while the effective frequency ranges can be adjusted by the height. This study extends the multifunctionality of TPMS-based cellular structures to include acoustic absorption and will facilitate the development of guidelines on designing the optimal acoustic absorbers by cellular structures in future.

基于三重周期性最小表面（TPMS）的聚合物细胞结构因其多功能性而被广泛研究用于多种学科。但是，基于TPMS的结构在声学方面的应用受到限制，因为它们的声学特性仍然未知。在本文中，通过增材制造制造了基于TPMS的结构，并对其进行了研究，并将其作为一种解决方案，以解决中频较高的声音问题。通过立体光刻制造基于三种典型表面类型（Primitive，Gyroid和Diamond）并具有三个与几何相关的参数（体积分数，单位晶胞大小和高度）的结构，并通过两麦克风阻抗法在2000-6000频率范围内进行测试赫兹。结果表明，基于金刚石表面的结构在宽带宽中在三种类型中显示出优异的吸收能力。高吸收系数可以通过较大的体积分数或较小的晶胞尺寸实现，而有效频率范围可以通过高度进行调整。这项研究将基于TPMS的蜂窝结构的多功能性扩展到包括吸声，并且将有助于将来开发有关通过蜂窝结构设计最佳吸声器的准则。