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Micro perforated panel with fibers passing through micropores and preparation method thereof

A micro-perforated plate and fiber technology, which is applied in the direction of sound-producing instruments and instruments, can solve the problems of insufficient sound absorption frequency band and poor absorption of the micro-perforated plate sound absorber.

Inactive Publication Date: 2010-12-15
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of the micro-perforated panels provided by the prior art is that compared with ordinary orifice-plate acoustic absorbers, the sound-absorbing frequency band of the micro-perforated-plate acoustic absorbers is still not wide enough. [3.4] , especially poor sound absorption for middle and low frequencies

Method used

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  • Micro perforated panel with fibers passing through micropores and preparation method thereof
  • Micro perforated panel with fibers passing through micropores and preparation method thereof
  • Micro perforated panel with fibers passing through micropores and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] First of all, choose an ordinary plate, which can be a flat or curved plate, and the material is not limited. The thickness is 1-500 mm, and the micro-perforated plate is prepared with millimeter-scale micro-holes. Then, penetrate the fibers in the micropores of the micro-perforated plate, the fiber diameter ranges from 1 to 100 microns, the fiber penetration rate ranges from 1% to 100%, the fiber penetration amount ranges from 1% to 100%, and the fiber material is not limited . In this way, the perforated fiber microperforated plate was prepared. Its application is still the same as that of ordinary micro-perforated plates, and a certain air layer needs to be left behind as a resonant cavity.

[0030] When the sound wave enters the micropores of the ordinary micro-perforated plate, it causes the friction between the air medium in the hole and the inner surface of the hole and consumes part of the sound energy.

Embodiment 2

[0032] (1) Preparation of the substrate

[0033] Take epoxy resin 128 and curing agent 593 in a ratio of 100:22; after stirring evenly, put it in a vacuum drying oven to evacuate to remove air bubbles;

[0034] Put the vacuumized material into ice water for cooling, about 15 minutes;

[0035] Pour the cooled material into the mold for casting; solidify at room temperature for 24 hours;

[0036] Remove the material from the mold.

[0037] The material of the substrate is not limited, and any material can be selected.

[0038] (2) Preparation of perforated fiber micro-perforated plate

[0039] The epoxy resin substrate obtained in (1) is made into a micro-perforated plate, and the parameters are:

[0040] Plate thickness: 4mm, hole diameter: 1mm, perforation rate: 7%, made into a micro-perforated plate. Penetration into wool fiber, penetration rate: 66.6%.

Embodiment 3

[0042] Method is with embodiment 2.

[0043] The parameters of the fiber perforated plate are as follows:

[0044] Board thickness: 2mm, hole diameter: 1mm, perforation rate: 6%, penetrate wool fiber, penetration rate: 100%.

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Abstract

The invention relates to a micro perforated panel with fibers passing through micropores and a preparation method thereof. The micro perforated panel is characterized in that the gaps in the micro perforated panel are provided with fibers which are arranged in a way of running from top down. A plurality of straight through holes are formed in the micro perforated panel, and the diameter of the pore is 0.1 to 10 millimeters. The micro perforated panel is a flat or curved plate with a thickness of 0.1 to 50 millimeters. The micro perforated panel is laminated or compounded by a plurality of layers. The diameter of the fibers is of a micrometer or millimeter scale. The arrangement of the fibers is continuous or non-continuous. The sound resistance of the micro perforated panel with fibers passing through can be adjusted. In general, by inserting a proper amount of wool fibers, the sound resistance can be increased, the sound absorbing frequency band can be expanded, and the resonance sound absorption coefficient can be improved at the same time.

Description

technical field [0001] The invention relates to a fiber micro-perforated plate with micro-holes and a preparation method thereof, which can improve sound resistance, broaden the sound-absorbing frequency band, and simultaneously increase the resonant sound-absorbing coefficient. Background technique [0002] The micro-perforated plate sound absorbing body has the characteristics of multi-band sound absorption, simple structure, no need to add sound-absorbing materials in the rear cavity, etc., and has been widely used and further researched [1] . Micro-perforated sound-absorbing materials have been used in large-scale projects such as swimming pools, gymnasiums, and road sound barriers, and are also widely used in industries that need to avoid foam materials such as food, medicine, instrumentation, electronics, aviation, and aerospace. [0003] Microperforated plate structure such as figure 1 shown. A large number of micropores are perforated on the thin plate, and the di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172G10K11/162G10K11/168
Inventor 徐颖
Owner NORTHWESTERN POLYTECHNICAL UNIV
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