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提出一种在薄板侧面周期嵌入空气柱的一维声子晶体模型,数值计算了兰姆波在该周期结构声子晶体中的传播特性.结果表明:由布拉格散射引起的第一完全禁带只在一定的占空比范围内存在,分别改变空气柱半径和晶格常数,禁带宽度可调且达到最大值时的占空比值基本相同.将占空比匹配的该一维声子晶体接合构成复合结构,低阶兰姆波完全禁带宽度因各组分兰姆波完全禁带交叠相加而显著增大.
A one-dimensional phononic crystal model with embedded air columns on the side of the sheet is proposed and the propagation characteristics of Lamb wave in the periodic phononic crystals are numerically calculated. The results show that the first complete forbidden band caused by Bragg scattering Which exists in a certain range of duty cycle and changes the radius of the air column and the lattice constant respectively, and the duty cycle values are basically the same when the forbidden band width is adjustable and reaches the maximum value. The one-dimensional phononic crystal with the duty cycle matching is bonded As a result, the complete bandgap of low-order Lamb waves increases significantly due to the complete overlap band of Lamb waves in each layer.