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Multi-cavity composite sound absorption structure

A technology of sound absorption and cavity, which is applied in the direction of sound-generating devices and instruments, can solve the problems of difficult to achieve full-band sound absorption, high-efficiency sound absorption, and difficult to deal with sound sources, etc., to achieve strong designability and excellent sound absorption performance , easily damaged heat preservation and moisture-proof effect

Pending Publication Date: 2021-11-02
CENT SOUTH UNIV
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Problems solved by technology

[0004] However, the traditional micro-perforated panel has only one sound absorption peak, which cannot maintain efficient sound absorption in a wide frequency band, and it is difficult to deal with complex sound sources in practice
Therefore, it is difficult to achieve full-band sound absorption with a single sound-absorbing material, and a reasonable composite method is needed to achieve effective sound absorption over a wide frequency band

Method used

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  • Multi-cavity composite sound absorption structure
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Embodiment Construction

[0029] In order to facilitate the understanding of the present invention, the present invention will be described more fully and in detail below in conjunction with the accompanying drawings and preferred embodiments, but the protection scope of the present invention is not limited to the following specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0030] Unless otherwise defined, all technical terms used hereinafter have the same meanings as commonly understood by those skilled in the art. "First", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only for the convenience of distinguishing corresponding components. Likewise, words like "a" or "one" do not indicate a limitation of quantity, but indicate that there is at least on...

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Abstract

The invention discloses a multi-cavity composite sound absorption structure which comprises a cavity, a plurality of partition plates are arranged in the cavity and divide an inner cavity of the cavity into a plurality of sound absorption unit cavities arranged in parallel in the axial direction of the cavity, the top of the cavity is covered with a first micro-perforated plate, and the bottom of each sound absorption unit cavity is provided with a bottom plate. And the depths of the sound absorption unit cavities are different. The multi-cavity composite sound absorption structure is simple in structure, convenient to install, light in weight, small in occupied space and wide in sound absorption frequency band. The multi-cavity composite sound absorption structure can conveniently regulate and control structural parameters of each unit according to required sound absorption frequency bands in practical application, and a continuous and stable sound absorption effect in a target frequency band is obtained.

Description

technical field [0001] The invention relates to the technical field of sound-absorbing structures, in particular to a multi-cavity composite sound-absorbing structure. Background technique [0002] With the increasing awareness of environmental protection, the negative impact of noise has attracted widespread attention, especially in the field of transportation. With the increase of train speed, the noise level and vibration energy level will increase, which will affect the safety of passengers in the carriage. Ride comfort, especially low-frequency noise, will affect the function of the central nervous system, cause irreversible damage to the auditory system, and cause precision instruments to malfunction or even stop working, threatening people's lives and property. Therefore, sound absorption and noise reduction has become the focus of people's research. [0003] The process of sound absorption is a process of energy dissipation. There are two main types of sound-absorbi...

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Application Information

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IPC IPC(8): G10K11/175
CPCG10K11/1752
Inventor 谢素超李臻刘项杨诗晨严宏宇
Owner CENT SOUTH UNIV
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