A structure that uses magnetism to improve low-frequency sound absorption performance

A low-frequency, sound-absorbing technology, applied in the direction of sound-emitting devices and instruments, can solve problems such as reducing the damping coefficient and reducing the elastic coefficient of mechanical impedance, so as to achieve the effects of reducing the elastic coefficient, improving low-frequency sound-absorbing performance, and reducing elastic force

CN108447465BActive Publication Date: 2020-11-03JIANGSU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-11-03

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Abstract

The invention discloses a structure improving low frequency sound absorption performance through magnetism. The structure comprises two identical lateral supports perpendicular to the wall surface anda mechanical impedance plate parallel with the wall surface, wherein the wall surface, the mechanical impedance plate and the two lateral supports form a square resonant cavity, the resonant cavity is internally provided with a pair of magnetic material blocks, one magnetic material block is fixedly connected with the wall surface, the other magnetic material block is fixedly connected with the mechanical impedance plate, the two magnetic material blocks are arranged face to face, the sizes of the magnetic material blocks are identical, polarities of the magnetic material blocks are opposite,and a viscoelastic material ring is adhered between the two lateral supports and the mechanical impedance plate. The attraction force of the magnetic material blocks is the same as the sound pressurein the direction and is opposite to the elastic force of the viscoelastic material ring, the magnetic force generated by the magnetic material blocks counteracts a part of the elastic force of the viscoelastic material ring, the elastic force of the elastic material ring is reduced, and the low frequency sound absorption performance is improved.
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Description

technical field

[0001] The invention belongs to the field of noise control, and in particular relates to a structure with sound absorption performance, which can absorb low-frequency noise below 500 Hz. Background technique

[0002] Commonly used sound-absorbing materials for noise control structures include: porous sound-absorbing materials such as glass wool, slag wool, rock wool, foam plastics, asbestos wool, felt, soft fiberboard, etc. Generally, porous sound-absorbing materials have good medium and high-frequency absorption Acoustic performance, but low-frequency sound absorption performance is not good. The sound-absorbing structure of the micro-perforated plate is also commonly used for noise control. Its sound-absorbing mechanism is cavity resonance, and there is also the problem of poor low-frequency sound-absorbing performance. In order to improve low-frequency sound absorption, it is necessary to adopt a method of thickening the sound-absorbing material layer, an...

Examples

Embodiment Construction

[0018] see figure 1 , Two horizontal brackets 2 perpendicular to the wall 1 are fixedly installed on the wall 1, and the two brackets 2 have the same structure and are parallel to each other. A mechanical impedance plate 5 parallel to the wall surface 1 is arranged between the two transverse supports 2, and the mechanical impedance plate 5 is parallel to the wall surface 1 with a certain distance therebetween. A square resonance cavity is formed between a mechanical impedance plate 5, two transverse supports 2, and the wall surface 1, and a pair of magnetic material blocks 6 are arranged inside the square resonance cavity, and one of the magnetic material blocks in the pair of magnetic material blocks 6 The blocks are fixedly connected to the wall 1 , and the other one of the pair of magnetic material blocks 6 is fixedly connected to the mechanical impedance plate 5 . That is, a pair of magnetic material blocks 6 are located between the wall 1 and the mechanical impedance pla...