【作者】 孙宏祥； 刘博阳；

【Author】 SUN Hong-xiang;LIU Bo-yang;Faculty of Science, Research Center of Fluid Machinery Engineering and Technology, Jiangsu University;

【机构】 江苏大学理学院流体机械工程技术研究中心；

【摘要】 本文设计一种多频带声非对称单向传输器件,它由两个不同栅格常数的周期性栅格与双层金属平板组成,在0-1500 k Hz范围中,共存在4个单向传输频带。该效应来自于周期性栅格产生的衍射波与金属平板中兰姆波相互作用,具有多频带,宽带,结构简单易实现等优点,在超声器件设计方面具有一定的潜在应用。更多还原

【Abstract】 We report both experimentally and numerically that the multi-band device of the asymmetric acoustic transmission is realized by placing two periodic gratings with different periods on both sides of two brass plates immersed in water. The asymmetric acoustic transmission can exist in four frequency bands below 1500 k Hz, which arises from the interaction between various diffractions from the two gratings and Lamb modes in the brass plates immersed in water. The results indicate that the device has the advantages of multiple band, broader bandwidth, and simpler structure. Our finding should have great potential applications in ultrasonic devices.更多还原