Non-reciprocal Sound Transmission in Electro-acoustic Systems with Time-Modulated Circuits  

作　　者：Yu Huang Xiaoming Zhou 

机构地区：[1]Key Laboratory of Dynamics and Control of Flight Vehicle,Ministry of Education,School of Aerospace Engineering,Beijing Institute of Technology,Beijing,100081,China

出　　处：《Acta Mechanica Solida Sinica》2022年第6期940-948,共9页固体力学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.11872111,11991030,11991033,and 11622215);the 111 Project (Grant No.B16003).

摘　　要：Non-reciprocal sound transmission is demonstrated in an electro-acoustic system consisting of two shunt loudspeakers with time-modulated circuits.The shunt circuit is modulated by periodically varying the resistance in time sequence,and a phase difference of time modulation is set between two sets of loudspeakers to produce a spatial bias.The spatiotemporal modulation of acoustic properties is thus formed to break the reciprocity.The theoretical model based on the transfer-matrix method is developed to predict acoustic scatterings of electro-acoustic systems.Acoustic asymmetric transmission in opposite directions is disclosed by the model and is verified by time-domain simulation results based on the finite-difference time-domain method.Asymmetric transmission in multiple frequency bands can be created by tuning circuit parameters,showing their ability in regulating acoustic non-reciprocal behavior.This study may provide a platform for the design of compact and non-reciprocal acoustic devices with applications to efficient noise control.

关 键 词：Non-reciprocity Shunt loudspeaker Time-varying circuits Spatiotemporal modulation 

分 类 号：TE973[石油与天然气工程—石油机械设备] O346.1[理学—固体力学]