恒频声学二极管的设计及特性研究

Design and Characteristics of Constant Frequency Acoustic Diode

声学二极管能控制声波仅在一个方向有效传输在反方向无法传播,在通信技术中具有广泛的应用,然而目前大多数的声学二极管设计是基于非线性效应使系统只通过新的高次频率并阻止原频率的传输.本文利用不对称结构与弱非线性声子晶体的组合,提出了一种一维声二极管模型,实现弹性波的不对称传输,并保持频率不变.该模型由左端的变幅杆和右端的非线性弹簧质量链组成,理论分析表明,该声学二极管具有与电子二极管相同的正向和反向特性,并通过有限元仿真验证了该模型的有效性.

Acoustic diode can control the sound wave in only one direction and cannot propagate in the opposite direction,which has potential application in communication technology.However,most of the current acoustic diode designs are based on nonlinear effects that make the system only through new high frequencies and prevent the transmission of the original frequency.In this paper,we use a combination of asymmetric structures and weak nonlinear phononic crystals to propose a one-dimensional acoustic diode model that enables asymmetric transmission of elastic waves and keeps the frequency constant.The model consists of a variable amplitude rod at the left end and a nonlinear spring mass chain at the right end.Theoretical analysis shows that the acoustic diode has forward,reverse and breakdown properties very similar to those of the electron diode.This paper has demonstrated the model by finite element simulation.