Ultrathin sound absorption structure capable of sound absorption in wide low-frequency range

Abstract

The invention discloses an ultrathin sound absorption structure capable of sound absorption in a wide low-frequency range, and belongs to the field of acoustic technologies. The structure is formed by arranging identical square cells uniformly, and each square cell is formed by fixing and connecting a front panel, an intermediate layer and a rigid backboard sequentially; through holes are processed in the front panels respectively; each intermediate layer is provided with a through hole the same with the through hole of the front panel and a large-caliber coiled solenoid and a small-caliber coiled solenoid which are coiled by taking the through hole as a start point; and the large-caliber the small-caliber coiled solenoids are distributed via serial connection, parallel connection or serial and parallel mixed connection. According to the invention, the coiled solenoids of different sizes are processed in the intermediate layers and distributed via serial connection, parallel connection or serial and parallel mixed connection, and the sound absorption structure is characterized by being ultrathin and enabling well sound absorption in the wide low-frequency range.

Description

Technical field [0001] The invention belongs to the technical field of acoustics, and specifically relates to an ultra-thin sound-absorbing structure with wide and low frequency sound absorption. Background technique [0002] Noise refers to the sound made when the sounding body vibrates irregularly, which will seriously hinder people's normal rest, study and life. On the one hand, noise pollution mainly comes from transportation, construction, industrial noise, social noise, household noise, etc. Therefore, noise reduction is particularly important for people's comfort in life not to be affected by noise. On the other hand, in the field of military applications, reducing the strong noise of a spacecraft during takeoff can reduce its damage to sensitive components; reducing the measurability of nuclear submarine engine noise is one of the key technologies to improve the survivability of nuclear submarines. [0003] However, low-frequency sound absorption and noise reduction has al...

AI Technical Summary

Problems solved by technology

[0008] However, the sound-absorbing structures designed by the first two methods can only improve the low-frequency sound-absorbing performance to a certain extent.

Although the third type of method can achieve good low-frequency sound absorption performance, it can only be realized at a single fixed frequency, and it needs a larger size to achieve wide and low-frequency sound absorption, which limits the application of this type of structure to a certain extent.

Although the fourth type of method can also achieve good low-frequency sound absorption performance, the thickness of the material is required to match the sound absorption wavelength, that is, the thickness is too thick, which limits the actual engineering application of this type of structure

However, the low-frequency sound absorption of its designed structure is a single frequency, which limits its practical application

[0010] Therefore, so far, there is still no structure that can achieve a sound-absorbing structure that has a wide frequency band and good sound-absorbing performance in the low-frequency domain while the material thickness is very thin.

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