A Helmholtz Sound Absorbing Device

Abstract

The present invention provides a Helmholtz sound absorption device, which includes a neck tube and a resonance cavity, the neck tube communicates with the resonance cavity through a communication hole of the resonance cavity, and also includes a sound absorption cavity communicated with the resonance cavity, On the wall of the resonance cavity opposite to the communication hole of the resonance cavity, a communication hole of the sound absorption cavity communicated with the sound absorption cavity is provided; the inner wall of the sound absorption cavity provided with the communication hole of the sound absorption cavity is the first inner wall, on which a helical structure is provided; on the first inner wall, a helical track is provided, and the curved surface formed from the track extending in a direction perpendicular to the first inner wall is The helical structure; the initial opening of the helix communicates with the communication hole of the sound absorption cavity. The Helmholtz sound absorbing device of the invention can expand the frequency range of absorbing sound waves, and is widely used in the field of noise control.

Description

technical field [0001] The invention belongs to the technical field of vibration and noise control, and relates to a vibration and noise control device. Background technique [0002] With the vigorous development of modern industry and transportation, the noise problem of enclosed spaces has become increasingly prominent. The noise in closed spaces such as pipelines, ship cabins, and automobile interiors will cause "acoustic fatigue" to related mechanical equipment, deteriorate the working environment, and reduce personnel work efficiency. In order to solve the problem of the generated noise, technologies for controlling and eliminating the noise have been developed. [0003] Noise control technologies are mainly divided into two types: active control and passive control. Among them, the introduction of electronic devices in the active control system will make the system complex, expensive, and even cause stability and reliability problems in some cases. Passive control t...

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Problems solved by technology

[0005] The traditional Helmholtz sound-absorbing structure also has certain problems, that is, it can effectively absorb the sound near its resonant frequency, but the resonant frequency is determined at the beginning of the design of the Helmholtz sound-absorbing structure, resulting in a relatively narrow sound-absorbing frequency band. Narrow, often used as a narrow-band low-frequency sound absorber; and its sound absorption performance is limited by the size and material of the structure, and the sound absorption coefficient is low

[0006] Therefore, the existing Helmholtz sound-absorbing structure needs to be improved

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