Muffling structure

Abstract

The invention discloses a muffling structure which comprises more than two layers of resonant film materials. The adopted film is soft, uneven in surface and has airflow barrier. The surface of the film is uneven on the basis of the soft film, so that the absorption peak of the resonant structure deflects to the low frequency, the absorption of the low frequency is promoted; and moreover, when the medium-high frequency sound is incident from different angles, the sound waves have a chance to reflect on the surface of the film repeatedly; and therefore, the opportunity that the sound waves pass through the airflow barrier film is greatly increased, the strong reflection of the smooth airflow barrier film on the medium-high frequency sound is avoided, most of the medium-high frequency sound can enter the structure to be absorbed, and the absorption of the medium, high and low-frequency sound is considered.

Description

technical field [0001] The invention relates to a noise reduction processing technology, in particular to a noise reduction structure for noise reduction processing. Background technique [0002] In daily life, industrial production and commercial environment, noise pollution is sometimes very serious, which brings troubles to people's work and quality of life. In order to reduce the adverse effects of noise pollution in the environment, fiber-based sound-absorbing materials have been widely used because of their ultra-thin, soft, weather-resistant, non-aging properties, convenient construction, and low cost. [0003] However, the sound-absorbing effect of fiber-based sound-absorbing materials will be affected by the thickness of the fiber diameter. The thinner the fiber material, the more effective the sound-absorbing effect will be at higher frequencies, but the sound-absorbing effect will be poor at low frequencies. For example, PP fiber with a diameter of 2-6 microns ha...

AI Technical Summary

Problems solved by technology

[0003] However, the sound-absorbing effect of fiber-based sound-absorbing materials will be affected by the thickness of the fiber diameter. The finer the fiber material, the sound-absorbing effect will increase at higher frequencies, but the sound-absorbing effect will be poor at low frequencies.

For example, PP fiber with a diameter of 2-6 microns has a good sound-absorbing effect on noise above 3000 Hz, but the sound-absorbing effect on noise in the range of 125-2000 Hz cannot meet the requirements of high-end users.

If a satisfactory sound absorption effect is to be achieved in a wide frequency range of 125-6000 Hz, the thickness and amount of the material can only be greatly increased, which will lead to a substantial increase in cost and greatly reduce the cost performance of the sound-absorbing material

[0004] Open-cell and semi-open-cell foamed sound-absorbing materials can adjust the optimal sound-absorbing frequency range by adjusting the open-cell ratio and cell density of the foam, but they cannot take into account the sound-absorbing effect on high-frequency noise and low-frequency noise

To make both high and low frequency noises have a better noise reduction effect, it is also necessary to greatly increase the thickness and amount of materials, which greatly increases the cost

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