Sound absorption unit, sound absorption structure and sound absorption method

Abstract

The invention discloses a sound absorption unit, a sound absorption structure and a sound absorption method. The sound absorption unit comprises cells, partition plates and a cover plate, wherein thecells are of the regular hexagon structures. The partition plates are arranged inside the cells, the cells are partitioned by the partition plates so that continuous labyrinth channels inside the regular hexagon structures, the cover plate covers the cells, the sound absorption structure comprises a plurality of the sound absorption units, the sound absorption units are subjected to resonance coupling, and noise of different frequencies can be absorbed by adjusting geometric parameters of the sound absorption units; the sound absorption method comprises the following steps that on the basis ofone or more noise frequencies to be absorbed, the geometric dimension of at least one sound absorption unit is determined, three-dimensional printing or mold opening machining is performed on the sound absorption units of the geometric dimension, the multiple sound absorption units are subjected to resonance coupling to form the sound absorption structure, and the opening of the sound absorptionstructure faces a noise source to absorb sound.

Description

technical field [0001] The invention relates to the field of noise control, in particular to a sound-absorbing unit, a sound-absorbing structure and a sound-absorbing method. Background technique [0002] With the continuous development of society, the harm of noise has become increasingly prominent. Noise not only seriously affects people's hearing experience, reduces the quality of life, and even affects people's health. Generally speaking, noise control can start from three aspects: sound source control, propagation path control and receiver isolation protection. Among them, the use of sound absorption means in the transmission path to effectively suppress the negative impact of noise has become an important means of engineering noise control. [0003] However, the control of low-frequency noise has always been a great challenge. Low-frequency noise has a long wavelength, slow attenuation in the air and strong penetrating ability. Therefore, traditional sound-absorbin...

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Problems solved by technology

[0006] 2) Rely on the development of 3D printing technology, but unlike the manufacturing in the laboratory, the volume of sound-absorbing panels and sound-absorbing hoods in engineering applications is relatively large, and 3D printing technology is not a mature manufacturing for mass production scheme, but the complex geometric shape is not suitable for mold making, and machining is also difficult

[0007] 3) At present, the evaluation of sound absorption effect is often carried out under the condition of vertical incidence of plane waves, but the situation of reverberation field has not been studied in depth enough. In engineering practice, whether the real sound absorption effect can meet expectations is debatable

[0008] 4) The application environment of the sound-absorbing structure is relatively complex, and its adaptability to high temperature, low temperature, oil pollution, vibration, etc. needs further experimental verification

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