Akademik Veri Yönetim Sistemi
Journal of Sound and Vibration, cilt.625, 2026 (SCI-Expanded, Scopus)
This article presents a theoretical study of the active acoustic metamaterial cell for nonreciprocal sound transmission in a broad frequency band. In order to achieve the nonreciprocity, dislocated sensor-actuator pairs are used. This contrasts with traditional vibroacoustic active control methods which rely on collocated sensor-actuator pairs to ensure the closed-loop system stability. The cell is activated with two independent decentralised velocity feedback loops, connecting feedback actuators to dislocated sensors through a constant feedback gain. Transducers induce spatially asymmetric control force which makes the propagation of acoustic energy through the cell direction-dependent and thus nonreciprocal. Despite the fact that the two decentralised feedback loops are based on dislocated transducers, and the distributed parameter nature of the cell, simple and practical conditions for a stable closed-loop system with efficient and broadband performance of the active cell are found. Special attention is paid to the power analysis of the reflected and transmitted waves, and the power dissipated within the metamaterial cell. It is theoretically shown that sound power transmission coefficient through the active cell is significantly different in two opposite directions of propagation at a broadband frequency range from 10 to 1500 Hz.