Sound-absorbing unit, sound-absorbing structure and sound-absorbing method

Abstract

Disclosed are a sound-absorbing unit, a sound-absorbing structure, and a sound-absorbing method. The sound-absorbing unit includes a cell, a partition, and a cover plate. The cell is a regular hexagonal structure, the partition is arranged in the cell, and the partition separates The cells form a continuous labyrinth channel in the regular hexagonal structure, the cells are covered by the cover plate, the sound-absorbing structure includes a plurality of the sound-absorbing units, and the resonance coupling between the sound-absorbing units is adjusted by adjusting the The geometric parameters of the sound-absorbing unit are used to absorb different frequency noises. The sound-absorbing method includes the following steps: determining the geometric size of at least one sound-absorbing unit based on one or more noise frequencies to be absorbed, and three-dimensional printing or mold opening processing. A sound-absorbing unit with geometric dimensions, resonantly coupling multiple sound-absorbing units to form a sound-absorbing structure, and directing the opening of the sound-absorbing structure to the 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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