A Piezoelectric Composite Phononic Crystal Plate for Noise Suppression and Power Generation

Abstract

The invention relates to a piezoelectric composite phonon crystal slab for denoising and power generation; the piezoelectric composite phonon crystal slab is formed by respectively arraying and fixing a plurality of mass sheets and piezoelectric patches on the top and bottom surfaces of an elastic thin plate; the surface containing piezoelectric patches of the elastic thin plate is provided with frame type grids; each frame type grid, each elastic thin plate unit defined by each frame type grid, mass sheets arranged on the top and bottom surfaces of the elastic thin plate unit, and the piezoelectric patch can form a piezoelectric composite phonon unit crystal cell; the piezoelectric composite phonon unit crystal cells are arrayed so as to form the piezoelectric composite phonon crystal slab. The piezoelectric composite phonon crystal slab can collect noise energy and output power, thus combining denoising with power generation.

Description

technical field [0001] The invention belongs to the field of novel sound insulation and noise reduction and vibration reduction technologies, and in particular relates to a piezoelectric composite phononic crystal plate for noise reduction and power generation, which is used for sound insulation and noise reduction as well as power generation. Background technique [0002] Environmental protection is an important support for the sustainable development strategy, and its main challenges include noise pollution, electromagnetic radiation pollution, air pollution, water pollution, etc. Among them, noise pollution has attracted much attention due to its characteristics of multiple sources, wide distribution, and uneven distribution. Noise pollution control has also become one of the important contents in the field of environmental protection and governance. Noise is mainly distributed in shopping malls, factories, highways, tunnels, railways, airports, substations and other plac...

AI Technical Summary

Problems solved by technology

[0004] Among these three types of noise reduction methods: (1) using anechoic cavity, anechoic chamber, porous plate and other chambers, although the porous structure is energy-saving and environmentally friendly, but the volume is large and the sound absorption frequency band is not wide; (2) using sponge, rubber Although the structure of materials such as glass wool and sound insulation cotton is simple, the thickness of low-frequency noise removal is relatively large, and multi-layer combination is required to be effective; (3) Although the active sound wave suppression method is effective, it requires additional sound wave detection and algorithms Processing and sound wave emission, not energy-saving, and the system structure is complex

These three types of methods have the disadvantages of broadband sound absorption, such as large volume or complex structure, and no energy saving, and the noise is only suppressed and offset or converted into air heat energy, and the noise energy is not well utilized.

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