Flake Acoustic Black Hole Energy Harvester

Abstract

The invention provides a sheet-shaped acoustic black hole energy harvester group device, comprising a plurality of acoustic black hole energy harvesters and a lower bottom sealing plate of the energy harvester group, and a plurality of acoustic black hole energy harvesters are sequentially bonded and connected; a plurality of acoustic black hole energy harvesters The black hole energy harvester is firmly connected with the lower bottom sealing plate of the energy harvester group. The invention can adjust many parameters, has good vibration reduction effect, is suitable for solving the problem of low-frequency vibration, covers a wide frequency range, and overcomes the shortcomings of low structural strength and weak bearing capacity of the traditional acoustic black hole. In the application of vibration reduction, multiple energy harvester group devices can be arranged in a tiled manner, and acoustic black hole energy harvesters with different structural size parameters can be combined arbitrarily. On the basis of not destroying the integrity of the structure and reducing the safety of the structure, the "swallowing and capturing" function of vibrating in the specified frequency band has been realized. The invention can realize designable control of low-frequency, medium-frequency and high-frequency vibrations. The additional mass of the acoustic black hole energy harvester is small, the realization method is simple and flexible, and the energy absorption efficiency can be adjusted in any combination.

Description

technical field [0001] The invention relates to a vibration and noise control and vibration reduction and noise reduction device, in particular to a vibration and noise reduction device based on the acoustic black hole effect and the principle of local resonance. Background technique [0002] Structural acoustic black hole effect (ABH Effect) refers to the phenomenon that when the thickness of the beam and plate shell gradually decays to zero, the bending wave inside the structure decays with the thickness, the wave number increases to infinity, and the wave velocity gradually slows down to zero. [0003] A typical one-dimensional acoustic black hole (Acoustic Black Hole, ABH) follows the power function h(x)=εx for the section thickness m Attenuated wedge structure. Where h(x) is the thickness of the acoustic black hole structure at x, ε is a constant, and the power exponent m is a positive rational number. Mironov proved that when the thickness change of the structure sat...

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Problems solved by technology

[0026] In view of the defects existing in the above-mentioned prior art, the object of the present invention is to provide an acoustic black hole energy harvester group device, which utilizes the structural acoustic black hole effect and the principle of local resonance to gather structural vibration bending waves and reduce the geometrical margin of the acoustic black hole coverage. Structural vibration and noise, solving the problems of the current vibration and noise control devices with few adjustment parameters, large volume and mass, and poor low-frequency vibration damping performance

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