Enhancement of elastic wave energy harvesting by utilizing a phononic crystal (PnC) is a hot topic in electroelastic systems. Piezoelectric energy harvesting (PEH) is implemented herein due to attaching a piezoelectric transducer (PZT) disk on a 2D starlike hole-type PnC with a line-defect. Waveguide and energy localization will lead to the amplification of harvestable mechanical energy using the opened complete bandgaps of the PnC. For a given line-defect PnC structure, two geometric parameters (diameter and thickness of the PZT disk) of the PEH device are found to be key factors to influence the energy harvesting performance. Therefore, the finite element method is used to obtain the optimal diameter and thickness of the PZT disk through the design of numerical experiments. Using the two optimal geometric parameters, the electric power amplification ratio of the present PEH device will be 26.7 times over that of the PEH device using a thin plate with the same outer dimensions.
Phononic crystal (PnC) has been proved for its manipulation and amplification of elastic waves. Using this characteristic of PnC to assist energy harvesting has remarkable effect. Generally, defect occurs when unit cell in PnC is replaced by another cell with different geometric or material properties, the output electric power of piezoelectric energy harvesting (PEH) devices will be significantly enhanced. In this study, a cross hole-type PnC-assisted PEH device with a large-size defect is presented by replacing several adjacent multiple cells with other cells. It is found that multiple peak voltages can be created within BG and multimodal energy harvesting can be performed. Compared with the defect mode composed of a small-size defect, energy localization and amplification of the proposed PnC leads to substantially enhancement of harvesting power after tailoring geometric parameters of a PEH device. This work will be expected to design PnC-assisted PEH devices in a reasonable way.
As an artificial periodic material, phononic crystals (PnCs) are suitable for energy harvesting from vibration and noise environments of equipments. A two-dimensional (2D) PnC with a point defect is presented to design a piezoelectric energy-harvesting (PEH) device. Using finite element (FE) simulations, bandwidth and electric power of the initial supercell using the PnC are obtained but do not attain the optimal performance. Therefore, five geometric parameters are considered to perform the numerical experiment using a five-factor and seven-level experimental design. The two relationships between the five geometric parameters and PnCs bandwidth, the five geometric parameters, and output power are finally obtained. The two functional relationships are regarded as a unified objective function to further optimize five geometric parameters. The optimized PnC-based PEH device will achieve better output power within broadband. It is expected to be used to design PEH devices to achieve better output power in wider bandwidth.
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