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Tube shape-variable inner insertion tube type honeycomb layer core sandwich plate sound absorption structure

A technology of inner intubation and honeycomb layer, which is applied in the direction of sound-generating devices and instruments, and can solve problems such as narrow bandwidth, thick structure, and heavy weight

Pending Publication Date: 2021-09-07
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a variable tubular inner insert type honeycomb core sandwich panel sound-absorbing structure, which solves the problem of the previous micro-perforated honeycomb core sandwich panel sound-absorbing structure. Insufficient low-frequency sound absorption performance, narrow bandwidth, thick structure, heavy weight, and difficulty in lightening are common problems in the market.

Method used

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  • Tube shape-variable inner insertion tube type honeycomb layer core sandwich plate sound absorption structure
  • Tube shape-variable inner insertion tube type honeycomb layer core sandwich plate sound absorption structure
  • Tube shape-variable inner insertion tube type honeycomb layer core sandwich plate sound absorption structure

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Embodiment

[0047] Examples of materials:

[0048] Steel: characterized by a density of 8000kg / m 3 , Young's modulus 210GPa, Poisson's ratio 0.28.

[0049] Air: characterized by a density of 1.29kg / m 3 , sound velocity 343m / s, dynamic viscosity coefficient 1.81×10 -5 Pa·s.

[0050] Structural dimensions and material selection of comparative examples:

Embodiment 1

[0055] The midline length of the honeycomb cavity is 30mm, the height of the honeycomb cavity is 50mm, the average inner radius of the variable tubular inner tube is 2.43mm, 3.00mm, 2.72mm and 2.46mm, and the length of the variable tubular inner tube is 8.76mm, 19.78mm, 9.82mm and 10.88mm, the axial relative roughness of the variable tubular inner tube is 0.1, the axial wave number of the variable tubular inner tube is 2π, the circumferential relative roughness of the variable tubular inner tube is 0, and the variable tubular shape The circumferential wave number of the inner tube is 8.

Embodiment 2

[0057] The midline side length of the honeycomb cavity is 30mm, the height of the honeycomb cavity is 70mm, the average inner radius of the variable tubular inner tube is 2.22mm, 2.96mm, 2.85mm and 2.37mm, and the length of the variable tubular inner tube is 12.41mm, 27.27mm, 16.07mm and 12.27mm, the axial relative roughness of the variable tubular inner tube is 0, the axial wave number of the variable tubular inner tube is π, the circumferential relative roughness of the variable tubular inner tube is 0, and the variable tubular shape The circumferential wave number of the inner tube is 10.

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Abstract

The invention discloses a tube shape-variable inner insertion tube type honeycomb layer core sandwich plate sound absorption structure, which is characterized in that one sides of a plurality of honeycomb cavities are sequentially fixed on the surface of an object needing acoustic treatment, the center of the other side of each honeycomb cavity is provided with a tube shape-variable inner insertion tube, and the radius of the inner wall surface of the tube shape-variable inner insertion tube meets a function relationship R (z, theta). According to the invention, the tube shape-variable inner insertion tube type honeycomb layer core sandwich plate sound absorption structure has perfect low-frequency broadband noise reduction performance, is light, thin and light in overall structure, and also has certain loading capacity; and in the aspect of controllability, more adjustable parameters are achieved so as to meet the practical requirements for solving different problems, the structure is simple, and commercialized manufacturing is easy.

Description

technical field [0001] The invention belongs to the technical field of air sound absorption, and in particular relates to a sound-absorbing structure of a variable tubular inner-pipe type honeycomb layer core sandwich panel. Background technique [0002] At present, the traditional honeycomb core sandwich panel noise reduction structure mainly realizes the dissipation of sound energy through the elastic deformation of the structure, so as to achieve the purpose of noise reduction. It is widely used in high-speed rail, aircraft and other transportation equipment. Considering its poor sound absorption performance, people later combined the micro-perforated panel and the honeycomb core sandwich panel structure to create a micro-perforated honeycomb core sandwich panel sound-absorbing structure. The introduction of micro-perforated panels makes the traditional honeycomb core sandwich panel structure form a new type of noise reduction structure mainly based on elastic deformation...

Claims

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Application Information

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IPC IPC(8): G10K11/168G10K11/172
CPCG10K11/168G10K11/172
Inventor 辛锋先张磊
Owner XI AN JIAOTONG UNIV
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