1. Experimental measurement of large-scale specimens confirms that the present DM-PLTSP can achieve better broadband low-frequency sound insulation performance compared to the mass law and traditional double-panel structures with the same surface density and thickness. In summary, this study presents a DM-PLTSP that can realize remarkable sound insulation performance within a broadband low-frequency range, and provides an efficient modeling method for the design and optimization of the DM-PLTSP. The study can facilitate the development of lightweight multifunctional metastructures possessing high load-bearing property and excellent lowfrequency sound insulation performance. CRediT authorship contribution statement Jiajia Guo: Methodology, Formal analysis, Investigation, Validation, Writing-Original draft;Conceptualization, Methodology, Formal analysis, Investigation, Validation, Writing-Original draft
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