Compact acoustic wave generator for low-frequency broadband

Abstract

The invention discloses a compact acoustic wave power generation device for low-frequency broadband. The device comprises a base, an Archimedean spiral resonant cavity, a metal substrate, and a piezoelectric sheet; the Archimedean spiral cavity is of a spiral tube structure with an opening formed at one end and the other end closed; the lower surface of the Archimedean spiral resonant cavity is fixed on the base, and the upper surface of the Archimedean spiral resonant cavity is fixedly connected with the metal substrate, and therefore, a closed structure that is only opened at the opening canbe formed; the piezoelectric sheet is disposed on the surface of the metal substrate and is provided with a positive electrode and a negative electrode; the device further comprises a mass block; andthe mass block is disposed on the surface of the piezoelectric sheet. The compact acoustic wave power generation device of the present invention, small in size, can amplify low-frequency sound pressure; the compact acoustic wave power generation device has wider effective energy collection frequency bands; since the compact acoustic wave power generation device only occupies a small space, the compact acoustic wave power generation device is convenient to install; efficient sound-electrical conversion of low-frequency sound wave energy can be effectively realized; the effective working frequency bands of the energy harvester can be extended; and energy can be provided for low-power electronic devices.

Description

technical field [0001] The invention relates to a compact sound wave power generation device for low frequency and wide band, belonging to the technical field of sound wave power generation equipment. Background technique [0002] In recent years, low-power wireless electronic devices such as wireless sensors and micro-electromechanical systems have developed rapidly, and how to supply energy for them has become a key technology that needs to be solved. Harvesting and utilizing environmental energy is expected to solve the energy supply problem of low-power electronic devices, making it unnecessary to replace batteries during deployment and achieve long-term operation. Acoustic energy is a kind of mechanical energy ubiquitous in the environment, which is not affected by the temperature, light, etc. in the environment. Especially low-frequency sound waves below 500 Hz are difficult to suppress due to their long wavelengths, and their propagation distances are long. There ar...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide a compact acoustic wave power generation device for low-frequency broadband, and solve the problem of large volume and heavy structure when the traditional structure is used for energy collection of low-frequency band sound waves , once the excitation frequency of the acoustic wave deviates from the resonance frequency of the acoustic resonance cavity itself, the recovered power value will drop significantly

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