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Built-in perforated plate type Helmholtz resonator and low-frequency broadband sound absorbing structure based on Helmholtz resonator

A resonator and perforated plate technology, applied in the field of low-frequency broadband sound-absorbing structures to achieve effective noise reduction

Pending Publication Date: 2019-02-15
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention mainly aims at the absorption of low-frequency noise in the air, and designs a built-in perforated plate Helmholtz resonator and a low-frequency broadband sound-absorbing structure based on it. The low-frequency broadband sound-absorbing structure is a multi-unit low-frequency broadband sound-absorbing structure

Method used

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  • Built-in perforated plate type Helmholtz resonator and low-frequency broadband sound absorbing structure based on Helmholtz resonator
  • Built-in perforated plate type Helmholtz resonator and low-frequency broadband sound absorbing structure based on Helmholtz resonator
  • Built-in perforated plate type Helmholtz resonator and low-frequency broadband sound absorbing structure based on Helmholtz resonator

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Embodiment

[0032] Such as Figure 1 ~ Figure 4 As shown, in the low-frequency broadband sound-absorbing structure based on the built-in perforated plate Helmholtz resonator in this embodiment, eight cavity resonators are arranged in the frame 9, and four of the eight cavity resonators are Helmholtz resonators. Helmholtz resonators, and the rest are built-in perforated plate Helmholtz resonators; the four Helmholtz resonators are respectively denoted as the first Helmholtz resonator 1, the second Helmholtz resonator 2, and the third Helmholtz resonator. Helmholtz resonator 3 and fourth Helmholtz resonator 4; first Helmholtz resonator 1, second Helmholtz resonator 2, third Helmholtz resonator 3 and fourth Helmholtz resonator The diameters of the small holes 10 on the surface of the Holtz resonator 4 are 1.5mm, 1.4mm, 1.4mm and 1.4mm respectively, and the thicknesses are 41mm, 30mm, 25mm and 21mm respectively; the four built-in perforated plate Helmholtz resonators are all A partition 12 i...

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Abstract

The invention belongs to the field of low-frequency vibration and noise reduction and relates to a built-in perforated plate type Helmholtz resonator and a low-frequency broadband sound absorbing structure based on the Helmholtz resonator. Each unit has a sound absorption peak of a specific frequency; and after a plurality of units are coupled in parallel, the structure can have a continuous low-frequency perfect sound absorption broadband. According to the built-in perforated plate type Helmholtz resonator, one or more separation plates are adopted, so that two or more peaks can be provided,and thus the sound absorption band can be further widened; and the built-in perforated plate type Helmholtz resonator can be used in combination with ordinary Helmholtz resonators in a matched manner,so that peak positions can be adjusted more flexibly; the parameters and peak positions of the units are strictly adjusted, so that a 100% continuous sound absorption broadband is almost obtained ina range of 450Hz to 1360Hz when the thickness of the structure is 60mm (1 / 60 wavelength); and therefore, the structure has great advantages and engineering application potentials compared with currentmature structures.

Description

technical field [0001] The invention belongs to the field of low-frequency vibration reduction and noise reduction, and in particular relates to a built-in perforated plate type Helmholtz resonator and a low-frequency broadband sound-absorbing structure based thereon. Background technique [0002] Low-frequency noise (200Hz-1500Hz) is currently a difficult problem that the global engineering community needs to deal with urgently. It is more obvious in automobiles, ships, aircraft and trains, and has seriously restricted the development of the performance of these equipment. For example, in a car, the low-frequency noise in the cabin can cause the resonance of some organs of the human body, causing a strong sense of discomfort and reducing its comfort quality; Elimination of these factors prevents maintenance personnel from working for a long time and reduces efficiency; it is even more serious for submarines. The performance of modern sonar and torpedoes has been significant...

Claims

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Application Information

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IPC IPC(8): G10K11/172
CPCG10K11/172
Inventor 吴九汇刘崇锐陈煦马富银杨征睿
Owner XI AN JIAOTONG UNIV
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