Study on the energy aggregation characteristics of annular acoustic black holes

Acoustic black holes (ABH), as a novel structural bending wave modulation technique, have demonstrated excellent performance in vibration and noise reduction, energy harvesting, and other applications. Currently, the research on acoustic black holes has primarily focused on two-dimensional circular acoustic black holes, with limited studies on new structural configurations. To address this gap, this paper investigates a circular acoustic black hole structure by establishing a finite element model using simulation software. A five-cycle sinusoidal burst excitation is applied to analyze the transient response. The energy concentration effect of the annular acoustic black hole is examined in the time domain through displacement field maps and time-domain amplitude plots, and its performance is compared with that of the conventional circular acoustic black hole. The influence of various structural parameters on the energy concentration behavior of toroidal acoustic black holes is systematically studied, and orthogonal experiments are designed to evaluate the combined effects of multiple factors. This experimental design provides a reference for future investigations into the properties of circular acoustic black holes.