基于声学超材料的穿孔板缺陷态俘能特性研究

Study on Energy Harvesting Characteristics of the Defect State of Perforated Plates Based on Acoustic Metamaterials

论文提出了一套适用于在低频段区间工作的声学超材料俘能装置.通过在含孔的声学超材料结构中制造一个局域共振缺陷态,进而将入射声波的弹性应变能集中在缺陷区域中,并利用压电晶片实现能量的转化.论文采用有限元的方法研究了元胞含孔的声学超材料在共振频率下俘获功率与电压的性能.进一步地,通过逐渐改变孔的尺寸,探究了孔径大小对俘能效果的影响.数值计算结果表明:相比于元胞不含孔的声学超材料俘能装置,通过在元胞上打孔可以明显地提高装置在低频段的俘能特性.论文提出的装置具有易加工,实用性强等优点,进一步提高了其在低频区间俘能的工作能力,具有潜在的应用前景.

An acoustic metamaterial energy harvesting device suitable for working in the low-frequency range is proposed. First, a defect state of local resonance is created by constructing defects in porous acoustic metamaterial structures, the elastic strain energy of incident acoustic waves is concentrated in the defect area, and the energy conversion is realized using piezoelectric chips. Then the finite element method is used to study the properties of power and voltage captured by a cellular porous acoustic metamaterial at resonant frequency. Furthermore, the influence of pore size on the energy harvesting effect is explored by changing the pore size gradually. It is found that compared with those of the device without holes, the energy capture characteristics of the device at low frequency can be significantly improved by drilling holes in the cell. The device proposed in this study has the advantages of easy processing and strong practicability, which further expands its ability to capture energy in low-frequency range and has potential application prospects.