Acoustic metamaterial barrier system for the spatial distribution of transformer noise

Abstract

An adjustable acoustic metamaterial barrier system for transformer noise spatial distribution characteristics comprises an acoustic metamaterial barrier (3) and a noise measurement and analysis system(2). The acoustic metamaterial barrier (3) is composed of a metamaterial support bracket (7) and a fractal structural acoustic metamaterial module (8). The metamaterial support bracket (7) is parallel to a transformer sound source surface (1). The fractal structure acoustic metamaterial module (8) is embedded in the metamaterial support bracket (4). The noise measurement and analysis system (2) measures the noise in the range of the acoustic metamaterial barrier (3), and obtains the spatial distribution characteristics of the noise. According to the spatial distribution characteristics of noise, fractal structural acoustic metamaterial modules (8) with different parameters are selected. As that acoustic wave is transmit to the acoustic metamaterial barrier (3), since the parameters of theacoustic metamaterial module (8) are selected according to the noise distribution characteristics of the corresponding position, the noise amplitude of the target noise reduction region can be greatly reduced.

Description

technical field [0001] The present invention relates to an acoustic metamaterial barrier. Background technique [0002] The noise of the transformer body mainly comes from the vibration of the iron core and winding, and the noise is concentrated in the multiplied frequency of 100Hz, mainly low-frequency noise. Transformer fan noise is broadband noise between 500-2000Hz. With the construction of the city, a large number of 110kV and 220kV substations are getting closer to the central city. The noise propagation environment is complex, and the interference and diffraction of sound waves have led to increasingly prominent transformer noise problems, which inevitably have an impact on the staff in the station and nearby residents. Therefore, how to control transformer noise in the transmission route has become an important problem to be solved urgently by the environmental protection department and the power department. [0003] At present, the noise reduction methods for tra...

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Problems solved by technology

The acoustic metamaterial barrier announced by the patent does not take into account the difference in the spatial distribution of noise. Once the sound barrier is established, it cannot be flexibly adjusted according to changes in the distribution of the spatial sound field, resulting in poor noise reduction effects.

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