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Nonlinear magnetic negative stiffness active sound absorption device

A technology of active sound absorption and negative stiffness, applied in the direction of sound-producing equipment, instruments, etc., can solve the problems of poor self-adaptation ability of magnetic negative stiffness film sound-absorbing device, poor environmental adaptability, fixed resonance frequency, etc., to enhance environmental adaptability , the effect of expanding the effective sound absorption band

Pending Publication Date: 2017-10-20
BEIJING MUNICIPAL INST OF LABOUR PROTECTION
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  • Abstract
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  • Application Information

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Problems solved by technology

There is also a magnetic negative stiffness sound-absorbing device, which can achieve low-frequency sound absorption with a small back cavity structure, but the resonance frequency is fixed and the environmental adaptability is poor.
In view of this, it is urgent to find another way to solve the problem of poor environmental adaptability of the magnetic negative stiffness film sound-absorbing device

Method used

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  • Nonlinear magnetic negative stiffness active sound absorption device

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Embodiment Construction

[0025] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.

[0026] In the description of the present invention, unless otherwise stated, the meaning of "plurality" is two or more; the terms "upper", "lower", "inner", "outer", "top", "bottom" , "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than Nothing indicating or implying that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation should therefore not be construed as limiting the invention.

[0027] In th...

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Abstract

The invention relates to the technical field of noise control and in particular to a nonlinear magnetic negative stiffness active sound absorption device which comprises a sound absorbing structure, a modulation controller and a noise frequency acquiring component. The sound absorbing structure comprises a base body, a diaphragm and an electromagnet. The base body is hollow and has an open on the top. The diaphragm coats the open of the base body. The diaphragm and the base body together form a sound-absorbing cavity the bottom of which is provided with the electromagnet. The outer surface of the diaphragm is provided with an iron sheet. One end of the modulation controller is electrically connected to the electromagnet and the other end of the modulation controller is used as a signal receiving port to be connected with the signal output port of the noise frequency acquiring component. The sound absorption device can change the negative stiffness of the electromagnet to a film according to the different noise frequencies so as to make the resonance frequency of the film structure coincide with the noise frequency, thereby realizing controllable active sound absorption performance of noise with different frequencies, enlarging the valid sound absorption frequency band of the sound absorption structure, and enhancing the environment adaptability of the sound absorption structure.

Description

technical field [0001] The invention relates to the technical field of noise control, in particular to a nonlinear magnetic negative stiffness active sound absorption device. Background technique [0002] In the field of noise control, membrane material is one of the commonly used sound-absorbing materials. The film combines the closed cavity to form a resonant sound-absorbing structure. Its sound-absorbing characteristics are related to the tension, surface density and depth of the back cavity of the film. It usually has better sound-absorbing performance near the resonance frequency. In practical applications, it is often combined with micro-perforation and other methods. To expand its sound absorption bandwidth. [0003] Micro-perforated sound-absorbing structure occupies an extremely important position in many resonant sound-absorbing structures. Since the groundbreaking work of Academician Ma Dayou in the 1970s, the sound-absorbing structure of micro-perforated panels...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172
CPCG10K11/172
Inventor 赵俊娟王月月李贤徽王文江朱丽颖朱亦丹张斌
Owner BEIJING MUNICIPAL INST OF LABOUR PROTECTION
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