Thin film acoustic metamaterial silencer and designing method thereof

Abstract

The invention discloses a thin film acoustic metamaterial silencer and a designing method thereof. The thin film acoustic metamaterial silencer comprises a pipeline, wherein a frame installation hole communicated with the pipeline is formed in the side face of the pipeline, and a plurality of layers of silencer frames are installed in the frame installation hole. Each silencer frame is provided with a plurality of thin film installation holes. A thin film is arranged in each thin film installation hole and is in a tensioned state. A mass block is arranged at the center of each thin film. Each thin film and the corresponding mass block form a unit cell of the silencer. When the noise frequency in the pipeline is consistent with the working frequency of the silencer, fluid in the pipeline can not vibrate any more due to the vibration of the unit cells, so that the noise of the frequency is eliminated. In terms of pipeline noise, the thin film acoustic metamaterial silencer is good in noise reduction effect, small in size and high in working frequency. By combining a thin film acoustic metamaterial with traditional pipeline acoustics, a new idea is provided for solving the pipeline noise problem.

Description

Technical field [0001] The invention belongs to the field of pipeline acoustic noise control, and specifically relates to a membrane acoustic metamaterial muffler and a design method thereof. Background technique [0002] Acoustic metamaterials are artificially designed materials that have been extensively investigated in the past few years, mainly because they have great application prospects and are almost difficult or impossible to find in nature. Therefore, they are used for improvement or even new applications. A door was opened. The acoustic material with a local resonance band gap reported in 2000 is the predecessor of the acoustic metamaterial and the earliest realized acoustic metamaterial. Acoustic metamaterials have negative mass density and elastic modulus. Membrane acoustic metamaterial is a new type of acoustic metamaterial that has received extensive attention in recent years. It consists of a rigid frame, a tensioned rubber membrane and a mass. Through the nega...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a thin-film acoustic metamaterial muffler and its design method, so as to overcome the difficulty in noise reduction of pipeline noise in the prior art, the technical problems of the volume of the muffler being too large, and the working frequency being single. Good noise reduction effect, small muffler size, and wide operating frequency; combining thin-film acoustic metamaterials with traditional pipeline acoustics provides a new idea to solve pipeline noise problems

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