期刊
ACTA MECHANICA SOLIDA SINICA
卷 35, 期 6, 页码 940-948出版社
SPRINGER
DOI: 10.1007/s10338-022-00345-0
关键词
Non-reciprocity; Shunt loudspeaker; Time-varying circuits; Spatiotemporal modulation
资金
- National Natural Science Foundation of China [11872111, 11991030, 11991033, 11622215]
- 111 Project [B16003]
This study demonstrates non-reciprocal sound transmission in an electro-acoustic system using time-modulated circuits, which can create asymmetric transmission in multiple frequency bands. The ability to tune circuit parameters for non-reciprocal behavior provides a platform for designing compact and efficient noise control devices.
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.
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