Acoustic metamaterial, acoustic vibration energy collector and electronic equipment

Abstract

The invention relates to an acoustic metamaterial, an acoustic vibration energy collector and electronic equipment. The acoustic metamaterial is of a periodic diamond crystal structure, the smallest repeating unit of the periodic diamond crystal structure is a lattice, each lattice comprises a truss unit, each truss unit comprises four straight-rod-shaped trusses that meet at a connection point, each truss extends outwardly from the connection point to form a section of cantilever, the surface of each cantilever is coated with a piezoelectric material layer, and the surface of each piezoelectric material layer is provided with a lead-out electrode. By utilizing the high absorption property of the specially designed acoustic metamaterial for acoustic waves in the bandgap frequency, the acoustic waves are efficiently converted into structural vibration of the material; and through attaching the piezoelectric materials to the near acoustic surface, far acoustic surface of the structure and the maximum deforming part inside the structure, the comprehensive and efficient collection of vibration energy is achieved, so as to provide instant energy for terminal equipment such as small portable electronic equipment and wireless micro-sensors.

Description

Technical field [0001] This application relates to the technical field of new energy sources, and in particular to an acoustic metamaterial, an acoustic vibration energy collector, and an electronic device that can efficiently absorb acoustic vibration energy with low energy density characteristics. 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 functional electronic devices have also developed in the direction of more miniaturization and integration. The power supply of these equipment terminals is usually independent power supply through chemical batteries, and the battery life is proportional to the size of the battery, which makes the miniaturization of the equipment and the equipment life a contradiction, and the current solution can only It is a compromise between the two issues. It can be seen that ...

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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