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Composite sound absorption and noise reduction structure and preparation method thereof

A composite structure, sound-absorbing technology, applied in the direction of sound-producing equipment, instruments, etc., can solve the problem of difficult control of low-frequency noise, and achieve the effect of enhancing sound absorption, facilitating the dissipation of sound energy, and increasing reflection and scattering.

Active Publication Date: 2021-11-02
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a composite sound-absorbing and noise-reducing structure and provide a corresponding preparation method to solve the problem that low-frequency noise is difficult to control

Method used

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  • Composite sound absorption and noise reduction structure and preparation method thereof
  • Composite sound absorption and noise reduction structure and preparation method thereof
  • Composite sound absorption and noise reduction structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A composite sound-absorbing and noise-reducing structure whose overall appearance can be a cylinder or a cuboid. In this embodiment, taking the composite sound-absorbing and noise-reducing structure as a cylinder and the number of partitions as two as an example, the components of the composite sound-absorbing and noise-reducing structure and the spatial relationship of each component are given. figure 1 and figure 2 The three-dimensional structure schematic diagram and cross-sectional schematic diagram of the prepared composite sound-absorbing and noise-reducing structure are given respectively. The composite sound-absorbing and noise-reducing structure described in this embodiment includes open-cell foam metal 1 , polyurethane foam 2 , polyurethane foam thin layer 3 , sidewall 4 , partition 5 and top plate 6 . A "cavity" is formed between the polyurethane foam / metal foam interpenetrating composite structure, the side wall 4, and the top plate 6, and the "cavity" and...

Embodiment 2

[0039] Preparation of a composite sound-absorbing and noise-reducing structure (the composite sound-absorbing and noise-reducing structure is a cylinder, and the foam metal used is open-cell aluminum foam):

[0040] Before use, the open-cell aluminum foam is first put into a potassium hydroxide solution with a concentration of 2%, soaked at 60°C for 10 minutes, then placed in a hydrochloric acid solution with a concentration of 1%, soaked at 30°C for 4 minutes, and finally used Rinse with deionized water and dry. In parts by weight, weigh 60 parts of polyether polyol 330N, 40 parts of polymer polyol 36 / 28, 2 parts of deionized water, 1.8 parts of silicone oil, 0.6 parts of catalyst A33, 0.1 parts of catalyst A-1, 0.5 parts Parts of cross-linking agent diethanolamine in the container, as a white material. In parts by weight, weigh 45 parts of modified MDI in a container, which is a black material. Mechanically stir the components in the white material. After the components ar...

Embodiment 3

[0044] Sound absorption coefficient test of open-cell aluminum foam and polyurethane foam / metal foam interpenetrating composite structures:

[0045] In Example 3, the transfer function method was used to test the sound absorption coefficient of the prepared aluminum foam and polyurethane foam / metal foam interpenetrating composite structures. The test uses the SW series impedance tube (SW420), the diameter of the impedance tube is 100mm, and the test frequency range is 100-1600Hz. In order to obtain the accurate sound absorption coefficient of the sample, the diameter of the test sample should be the same as that of the impedance tube, and each sample should be tested 3 times, and the average value should be taken.

[0046] The sound absorption coefficient of open-cell aluminum foam and polyurethane foam / metal foam interpenetrating composite structure in embodiment 3 is as follows Figure 4 shown. The thickness of the open-cell aluminum foam used is thin (~1cm), the pore size...

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Abstract

The invention discloses a composite sound absorption and noise reduction structure and a preparation method thereof. According to the composite sound absorption and noise reduction structure, polyurethane foam is introduced into open-cell foam metal through a foaming method to form a polyurethane foam / foam metal interpenetrating composite structure, and a polyurethane foam thin layer and a designed Helmholtz resonant cavity with a special structure are connected to prepare the composite sound absorption and noise reduction structure. The Helmholtz resonant cavity is composed of a side wall, a partition plate and a top plate. The partition plate is provided with circular through holes with the sizes distributed in a gradient mode from inside to outside, and in addition, a layer of polyurethane foam exists on the surface of the partition plate. The composite sound absorption and noise reduction structure is not prone to damage, the preparation process is relatively simple, and low-frequency noise can be effectively absorbed within a wide frequency range.

Description

technical field [0001] The invention relates to a composite sound-absorbing and noise-reducing structure and a preparation method thereof, belonging to the technical field of sound-absorbing materials. Background technique [0002] While the rapid development of modern industry, construction and transportation brings convenience to people's life, the resulting noise pollution also seriously affects people's health, work and life. Noise can be controlled from three aspects: sound source, propagation path and receiving point. However, considering the limitations of practical conditions, controlling noise in the propagation path is the most common means. In the control of noise pollution, it is often used to place sound-absorbing and sound-insulating materials in the noise transmission path to reduce the harm of noise to the human body. Mid to high frequency noise can be easily absorbed by porous materials. Studies have shown that open-cell metal foam with a bottleneck struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/168G10K11/172C08G18/66C08G18/63C08G18/48C08G18/32C08G101/00
CPCG10K11/168G10K11/172C08G18/632C08G18/48C08G18/4072C08G18/3275C08G18/6688C08G2101/00C08G2110/0083
Inventor 刘家安董智强刘胜军宋达曹仁中
Owner JILIN UNIV
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