Broadband air noise energy collection surface material

Abstract

The invention discloses a broadband air noise energy collection surface material comprising at least two unit bodies in periodic arrangement; the unit body comprises two Helmholtz resonators with different trunnion radius and a same dimension cavity and arranged side by side, wherein two cavities are separated by a copper sheet; two piezoelectric ceramics are arranged in one of the two cavities, and arranged on the copper sheet. The broadband air noise energy collection surface material can control phase shift formed in the resonance frequency portion, can form coupling resonance with anti-phase in the structure, thus realizing broadband high efficiency sound electric energy collection. The material utilizes the resonance acoustics effect; the thickness of the structure is only 1 / 27 of thewavelength corresponding to the highest work sound wave frequency, thus providing ultrathin effects; the structure introduces symmetry, so the voltage outputted by each acoustical-electrical transducer in the structure has high cophasal features; compared with a conventional method, the circuit complexity can be simplified in a cascade process, thus improving stability.

Description

technical field [0001] The invention relates to a surface material for collecting broadband air noise energy and belongs to the field of acoustics. Background technique [0002] For decades, due to the use of fossil energy, the increasingly severe environmental problems have made people think about how to discover and utilize renewable energy in nature. Water energy, wind energy, solar energy and nuclear energy have all been applied on a large scale. In contrast, sound energy usually has a very low energy density, so this clean and renewable new energy is often ignored in most cases, but in some special application scenarios, such as replacing the power supply battery of small devices, wireless Charging, supplying energy for microelectronic devices, etc., also have high application value. As mentioned above, sound energy usually has a low energy density, which is especially prominent on sound waves in the air, and it is usually very difficult to collect sound energy in the ...

AI Technical Summary

Problems solved by technology

However, unlike sound absorption, since the resonance strength and vibration phase are usually coupled together, when this method is used for acoustic-electric energy harvesting, the voltage output from multiple resonance units with different eigenfrequency must have a frequency-dependent phase Poor, this feature causes the output voltage of each resonance unit to be rectified first before being cascaded, and the complex and large number of circuits at the back of the collection device become a burden that drags down the economy and practicality

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