Efficient space-extended composite sound insulation structure

Abstract

The invention relates to an efficient space-extended composite sound insulation structure. The structure comprises a sound insulation base layer, and the sound insulation base layer is of a regular plate-cavity-plate composite sound insulation structure; one side of the sound insulation base layer is provided with a low-frequency sound absorption body which is of a hollow structure in a composited mode; and a continuous and bent acoustic wave passageway is formed in the low-frequency sound absorption body, and an acoustic wave inlet is formed in the side face, be back on to the sound insulation base layer, of the acoustic wave passageway. According to the efficient space-extended composite sound insulation structure, through structural design of the continuous and bent acoustic wave passageway in the low-frequency sound absorption body, the acoustic wave propagation route is prolonged, and acoustic reactance is improved; and a good sound insulation effect is achieved aiming at low-frequency noise, and by adjusting the length of the acoustic wave passageway, the different acoustic wave frequency band ranges can be aimed at.

Description

technical field [0001] The invention belongs to the technical field of sound insulation structures\materials, and in particular relates to a space-extending high-efficiency composite sound insulation structure. Background technique [0002] In daily life, we can see various sound insulation structures everywhere, such as doors, windows, walls, screens, sound barriers, sound insulation covers, etc., to deal with various annoying noises. Studies have shown that sound insulation generally obeys the law of mass, that is, if you want to have a good sound insulation effect, you need a sound insulation structure with a larger surface density. If you want to obtain a good low-frequency sound insulation effect, you need a fairly thick insulation acoustic structure. Of course, we can "beyond" the law of mass through some compound structures. [0003] At present, it is common to add multilayer boards with cavities (or sound absorption and damping layers) to achieve an optimized sound...

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Problems solved by technology

[0003] At present, it is more common to add multilayer boards with cavities (or sound absorption and damping layers) to achieve an optimized sound insulation structure. However, in the face of low frequency noise, the effect is still obviously not good.

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