Research on sound insulation performance of the M-type folded core sandwich panel
As an advanced composite sandwich structure,the configuration of folded core is diverse,and previous research has mostly focused on the V-shaped folded core,while there is still relatively little research on the sound insulation performance of other configurations.A numerical model of a four sided simply supported M-shaped fold-ed core sandwich panel under vertical incident sound pressure excitation is established,and the numerical simulation of its sound insulation performance based on finite element software is conducted.The theoretical predicted sound transmission loss curve of the honeycomb sandwich panel is compared with the simulation results.Based on simula-tion models,the sound insulation performance of M-type folded core sandwich panel structure is systematically studied,and the qualitative influence of geometric parameters of folded core cell on sound insulation performance is discussed.The influence of relative misalignment and laying angle of the upper and lower layers of M-type folded core sandwich panel with double-layer core on sound insulation performance is proposed and studied.The results show that the sound insulation performance is improved when the upper and lower layers of core are staggered and stacked in the Z-shaped line step direction of the cell,and it is better than single-layer folded core sandwich panel with the same surface density.When the relative laying angle of the upper and lower layers of core changes,the maximum weighted sound insulation reached the most value while the axis of the upper and lower layers of core is vertically laid.
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维普
