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

Abstract

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.

Study on the Influence Factors on Harvesting Capacity of a Piezoelectric Vibration Energy Harvesting System Covered on Curved Beam with Acoustic Black Hole

“…If bending wave propagates in ABH, along with the thickness of the structure decreasing to zero, the wavelength is compressed, the wave velocity decreases, and the refection does not occur at the location where thickness is zero, thus forming local energy accumulation [1][2][3]. With the deepening research of dynamics analysis theory for ABH [4,5], ABH also shows great potential for vibration and noise control [6][7][8][9][10][11][12][13][14][15], energy harvesting [16][17][18], and bending wave manipulation [19][20][21]. With the help of pasting piezoelectric sensors, vibration energy is transferred into electrical energy and the purpose of energy harvesting is achieved [22].…”