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Fractal-structure acoustic metamaterial device used for noise reduction of transformer

A technology of acoustic metamaterials and fractal structures, which is applied to parts of pumping devices for elastic fluids, non-variable pumps, machines/engines, etc., can solve problems such as unsuitable transformers, and achieve low manufacturing costs. Single, simple effect

Active Publication Date: 2019-01-11
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI +1
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  • Abstract
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Problems solved by technology

But this device is not suitable for transformers that have been built and put into use

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  • Fractal-structure acoustic metamaterial device used for noise reduction of transformer
  • Fractal-structure acoustic metamaterial device used for noise reduction of transformer
  • Fractal-structure acoustic metamaterial device used for noise reduction of transformer

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] like Figure 5 As shown, the present invention includes a fractal structural acoustic metamaterial 1 , a metamaterial frame 3 and a metamaterial support bracket 4 . The fractal structural acoustic metamaterial 1 is fixed by the metamaterial frame 3 and embedded in the metamaterial support bracket 4, which constitutes as Image 6 The acoustic metamaterial device shown.

[0027] like figure 1 As shown, the fractal structural acoustic metamaterial 1 of the embodiment of the present invention is a cuboid structure with an acoustic waveguide 2 and a bottom plate. The width of the acoustic waveguide is 2mm, the thickness of the bottom plate is 5mm, and the size of the cuboid is: 65*65*195mm. Air circulates along the acoustic waveguide 2 in the fractal structural acoustic metamaterial 1 . The bottom plate is located at the bottom of the fr...

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Abstract

The invention discloses a fractal-structure acoustic metamaterial device used for noise reduction of a transformer. A fractal-structure acoustic metamaterial (1) of the device is fixed by a metamaterial framework (3) and is placed into a metamaterial supporting support (4). The metamaterial supporting support (4) is placed in front of a ventilation opening of the transformer and is parallel to theventilation opening of the transformer. The fractal-structure acoustic metamaterial (1) is of a cuboid structure with an acoustic wave waveguide (2) and a bottom plate, and air circulates in the fractal-structure acoustic metamaterial (1) along the acoustic wave waveguide (2). When acoustic waves are transmitted to the fractal-structure acoustic metamaterial (1), the acoustic wave amplitude of atarget area is greatly reduced due to the characteristics of strong reflection and the equivalent high refraction rate.

Description

technical field [0001] The invention relates to a fractal structural acoustic metamaterial device for transformer noise reduction. Background technique [0002] Substation is an important place for power transmission and transformation in the power system. With the expansion of cities and the increase of people's demand for electricity, some substations have been built in densely populated areas. The running noise of the transformer in the substation has caused great troubles to the lives of the surrounding residents. Therefore, the control of transformer noise has become an urgent problem to be solved. [0003] The noise of the transformer mainly comes from the vibration of the iron core caused by magnetostriction and the noise generated by the operation of the cooling device. The core vibration noise is concentrated at the even harmonic frequency of 50Hz. The cooling device, that is, the rotation of the cooling fan, will generate broadband noise. [0004] At present, ...

Claims

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Application Information

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IPC IPC(8): F04D29/66
CPCF04D29/663F04D29/665
Inventor 赵欣哲刘国强张超夏东王天正芦竹茂
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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