Helmholtz sound absorption device

Abstract

The invention provides a Helmholtz sound absorption device which comprises a neck tube and a resonant cavity, the neck tube and the resonant cavity are communicated through a resonant cavity communication hole, the Helmholtz sound absorption device further comprises a sound absorption cavity communicated with the resonant cavity, and a sound absorption cavity communication hole communicated with the sound absorption cavity is formed in the wall, opposite to the resonant cavity communication hole, of the resonant cavity; the inner wall of the sound absorption cavity provided with the sound absorption cavity communication hole is a first inner wall, and a spiral structure is arranged on the first inner wall; the first inner wall is provided with a track in a spiral line shape, and a curved surface formed by extending from the track in the direction perpendicular to the first inner wall is of the spiral structure. And the initial opening of the spiral line is communicated with the sound absorption cavity communication hole. The Helmholtz sound absorption device can expand the frequency range of sound wave absorption, and is widely applied to 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...

AI Technical Summary

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

Images