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Extension pipe type perforated plate honeycomb sandwich sound absorption structure

A technology of honeycomb interlayer and perforated plate, which is applied in the direction of jet propulsion devices, gas turbine devices, machines/engines, etc., can solve problems such as difficult to achieve effective absorption of lower frequency noise, and achieve excellent sound absorption effect, easy design, and simple structure Effect

Inactive Publication Date: 2019-11-01
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of keeping the thickness unchanged, it is difficult for the traditional acoustic lining structure to effectively absorb lower frequency noise

Method used

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  • Extension pipe type perforated plate honeycomb sandwich sound absorption structure
  • Extension pipe type perforated plate honeycomb sandwich sound absorption structure
  • Extension pipe type perforated plate honeycomb sandwich sound absorption structure

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Such as figure 1 As shown, an extended tubular perforated plate honeycomb sandwich sound-absorbing structure includes the following parts:

[0029] a plate-shaped perforated plate 1 with several micropores evenly distributed;

[0030] flat back plate 4;

[0031] The honeycomb base between the perforated plate 1 and the back plate 4.

[0032] Among them, the perforated plate 1, the honeycomb base, and the back plate 4 are fixedly connected sequentially from top to bottom. Parallel to each other, the honeycomb seat has several honeycomb cavities 3, the shape of the honeycomb cavity 3 is a regular hexagonal prism, and the overall length direction of the honeycomb cavity 3 is perpendicular to the perforated plate 1 and the back plate 4, and each honeycomb cavity 3 corresponds to a thin hollow The extension tube 2 in the shape of a round tube, the upper end of each extension tube 2 is fixedly connected to the lower surface of the perforated plate 1 and communicated with o...

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Abstract

The invention relates to an extension pipe type perforated plate honeycomb sandwich sound absorption structure in the technical field of sound linings. The extension pipe type perforated plate honeycomb sandwich sound absorption structure is composed of a perforated plate, extension pipes, a honeycomb seat and a back plate, honeycomb cavities of the honeycomb seat each are a regular hexagonal prism-shaped hollow cavity, the perforated plate and the back plate are correspondingly arranged at the top and the bottom of the honeycomb seat, the extension pipes each are a thin hollow circular pipe,and extend out of micro-pores in the perforated plate and are positioned inside a honeycomb core, and the perforated plate and the back plate correspondingly seal the upper ends and the lower ends ofall the honeycomb cavities to form several helmholtz resonant cavities. According to actual sound absorption requirements, multiple different honeycomb cavity sizes and extension pipe lengths can be designed to form the helmholtz resonant cavities with different sound absorption frequency curves, so that the low-frequency sound absorption performance of the integral structure is greatly improved,meanwhile, the sound absorption frequency band is widened, the frequency-sound absorption coefficient curve has high designability; and compared with a traditional perforated plate sound lining in theaspect of the structure, the overall thickness is reduced, the weight is lighter, and the extension pipe type perforated plate honeycomb sandwich sound absorption structure is suitable for application in engineering practice.

Description

technical field [0001] The invention relates to the technical field of acoustic linings, in particular to a honeycomb sandwich sound-absorbing structure in which extension pipes are added inwardly on a perforated plate. Background technique [0002] The rapid development of air transport has brought about increasingly serious noise pollution problems. In response to this problem, installing perforated plate acoustic lining assemblies (ie, acoustic linings) in the engine flow channel is also regarded as the most potential noise reduction technology. In recent years, with the wide application of high bypass ratio engines in the field of civil aviation, the main frequency range of aviation noise has gradually decreased. In the case of keeping the thickness constant, it is difficult for the traditional acoustic lining structure to effectively absorb lower frequency noise. Contents of the invention [0003] The purpose of the present invention is to provide an extended tube-ty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02C7/24F02C7/045F02K1/82
CPCF02C7/045F02C7/24F02K1/827
Inventor 杨程张鹏林黄煜
Owner SHANGHAI JIAO TONG UNIV
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