“…Sandwich structures consisting of two parallel plates reinforced by sets of spatially periodic rib-stiffeners form a class of structural elements of practical importance in various fields of engineering applications, such as aeronautics, astronautics, naval architecture, and automotive engineering. [1][2][3][4][5] Most sandwich structures have the advantages of being lightweight, high specific strength, high specific stiffness and multi-functional integration. 6,7 However, from the perspective of the law of mass, these properties of high specific stiffness and strength lead to a poor performance in the vibro-acoustic fields.…”