Sound transmission loss analysis of lattice sandwich structures based on NIAH

HOU Zhonghua; LIU Bingxin; ZHANG Sijia; WANG Wensheng

doi:10.16579/j.issn.1001.9669.2025.12.008

Abstract：Lattice sandwich structures possess excellent mechanical properties such as high specific strength,impact resistance,and noise reduction,which are widely used in construction,vehicles and ships,aerospace,and other fields.In the design of such engineering structures,it is crucial to improve the acoustic isolation performance of the structure to reduce noise.Due to the large number of fine-scale components in the lattice sandwich structures,detailed finite element numerical analysis of these structures entails a significant computational workload,generally necessitating their equivalence to homogeneous structures for structural response analysis.Firstly,a theoretical model was established for sound transmission loss(STL)of lattice sandwich structures under the condition of vertical incidence of simple harmonic acoustic waves.The novel implementation of the asymptotic homogenization method(NIAH)was briefly described,and the feasibility of calculating STL of lattice sandwich structure was analyzed based on this method.On this basis,the STL of the reinforced honeycomb lattice sandwich structure unit cell was predicted using the asymptotic homogenization method.Meanwhile,an acoustic analysis model of the structure was established in finite element software,and the reliability of the theoretical calculation was verified by comparing the STL curves of the structure.Finally,the effects of key parameters such as panel thickness and core layer size on the acoustic isolation performance of the reinforced honeycomb lattice sandwich structure were discussed.The results of the study provide reference for the acoustic performance analysis of lattice sandwich structures.