Research on Vibration Energy Harvester Based on Two-Dimensional Acoustic Black Hole

The wave energy focus effect of an acoustic black hole (ABH) is used for broadband vibration energy harvesting and boosts the harvested power. A vibration energy harvester based on two-dimensional ABH is proposed in this study, which consists of a rectangle plate with 2-D ABH and PZT film attached. The structure of ABH was designed and analyzed based on numerical simulation. The optimal parameters of the ABH were obtained, such as the power index, truncation thickness, cross-sectional length, and round table diameter, which were 3, 0.4 mm, 40 mm, and 24 mm, respectively. The quadratic velocity of the plate surface with ABH is up to 22.33 times that of a flat plate, and PZT film adheres to the corresponding positions of the ABH structure and plate structure, respectively. In the same condition, the average output power of a PZT with an ABH structure is higher than that of a flat plate under the same excitation-vibration condition.

Automated summary

In this study, a vibration energy harvester based on a two-dimensional acoustic black hole (ABH) was proposed, which utilizes the wave energy focus effect of ABH to increase harvested power. The structure of ABH was designed and analyzed using numerical simulation, and optimal parameters such as power index, truncation thickness, cross-sectional length, and round table diameter were obtained. The quadratic velocity of the plate surface with ABH was determined to be 22.33 times higher than that of a flat plate, and PZT film was attached to the corresponding positions of the ABH structure and plate structure. Under the same excitation-vibration condition, the average output power of a PZT with an ABH structure was found to be higher than that of a flat plate.