Acoustic metamaterials, acoustic vibration energy harvesters and electronics

Abstract

The application relates to an acoustic metamaterial, an acoustic vibration energy harvester and an electronic device. The acoustic metamaterial has a periodic diamond crystal structure, the smallest repeating unit of the periodic diamond crystal structure is a lattice, and each The lattice includes truss units, and each truss unit includes four straight bar-shaped trusses that meet at a connection point, and each truss has a section of cantilever extending outward at the connection point, and the surface of the cantilever is covered There is a piezoelectric material layer, and the surface of the piezoelectric material layer is provided with extraction electrodes. By utilizing the strong absorption characteristics of specially designed acoustic metamaterials for sound waves in the bandgap frequency, it can be efficiently converted into structural vibration of the material, and attached to the near-sound surface, far-sound surface of the structure and the maximum deformation inside the structure Piezoelectric materials can achieve comprehensive and efficient collection of vibration energy, so as to provide instant energy for terminal equipment such as small portable electronic devices and wireless micro-sensor devices.

Description

technical field [0001] The present application relates to the field of new energy technologies, and in particular to an acoustic metamaterial capable of efficiently absorbing acoustic vibration energy characterized by low energy density, an acoustic vibration energy harvester and electronic equipment. Background technique [0002] In recent years, in people's daily life, small portable electronic devices, wireless sensors and micro-electromechanical systems (MEMS) have become more and more popular, and various practical and functional electronic devices are also developing towards more miniaturization and integration. The power supply mode of these equipment terminals is usually independently powered by chemical batteries, and the battery life is proportional to the size of the battery, which makes the miniaturization of the equipment and the battery life of the equipment a contradiction, and the current solution can only be It is a compromise between two issues. It can be ...

AI Technical Summary

Problems solved by technology

However, due to the low power density of sound energy, sound energy usually needs to be limited or localized by structural design before it can be effectively collected and converted into electrical energy.

At present, the structural design of the traditional acoustic wave-based energy harvesting method has limitations in practical applications, such as difficulty in miniaturization, large resonance frequency error, etc., and it is difficult to popularize, and the energy conversion efficiency is not satisfactory, which greatly restricted application

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