Sound absorption assembly for anechoic chamber and anechoic chamber

Abstract

The invention discloses a sound absorption assembly for an anechoic chamber and the anechoic chamber. The sound absorption assembly for the anechoic chamber comprises a perforated outer frame and a plurality of layers of polyester fiber cotton; the perforated outer frame wraps the outer edges of the multiple layers of polyester fiber cotton; the densities of the multiple layers of polyester fiber cotton are different; the densities of the multiple layers of polyester fiber cotton are different; and the multiple layers of polyester fiber cotton are sequentially arranged along the thickness direction of the perforated outer frame. The polyester fiber cotton of different densities can absorb sound waves of different frequency bands, and based on the characteristic, the multiple layers of polyester fiber cotton of different densities are arranged in the perforated outer frame to achieve noise elimination of multi-frequency-band sound, and a sound absorption wedge does not need to be used in a matched mode. Therefore, the problems that a sound absorption structure used by an existing anechoic chamber still needs to be provided with a sound absorption wedge to achieve an anechoic chamber with the cut-off frequency below 100 Hz, only the length of the sound absorption wedge is reduced, and improvement and development need to be carried out are solved.

Description

technical field [0001] The invention relates to the technical field of acoustics, in particular to a sound-absorbing component for an anechoic chamber and the anechoic chamber. Background technique [0002] The anechoic chamber is not only a special laboratory for acoustic testing, but also an important part of the testing system. In fact, it is also one of the acoustic testing equipment, and its acoustic performance index directly affects the accuracy of the test. The anechoic room is divided into full anechoic room and semi-anechoic room. The sound-absorbing layer on all six sides of the room is called a full anechoic room, generally referred to as an anechoic room. Of the six sides of the room, only five sides are covered with sound-absorbing layers, which is called a semi-anechoic room. The main function of the anechoic chamber is to provide a free or semi-free sound field space for acoustic testing. Its sound absorption treatment is the key to ensure good free sound ...

AI Technical Summary

Problems solved by technology

[0006] In view of the above deficiencies in the prior art, the object of the present invention is to provide a sound-absorbing assembly and an anechoic chamber for an anechoic chamber, aiming to solve the problem that the sound-absorbing structure used in the existing anechoic chamber needs to achieve a cut-off frequency below 100 Hz. The anechoic chamber still needs to be equipped with sound-absorbing wedges, but the length of the sound-absorbing wedges is reduced, which still needs to be improved and developed.

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