Design method for noise-absorption metal fibrous porous material, metal fibrous porous material and preparation method thereof

Abstract

The invention provides a design method for a noise-absorption metal fibrous porous material, the metal fibrous porous material and a preparation method thereof. According to the design method, the porosity and the fiber diameter of the metal fibrous porous material meet the following relational expression: phi<opt>=x1e<x2D>+x3e<x4D>, wherein, phi<opt> is the optimal porosity, D is the fiber diameter, x1, x2, x3 and x4 are constant coefficients and are changed with change of the thickness and the noise frequency of the metal fibrous porous material and obtained by calculating a plurality of data points through an optimization method. Under the condition that the noise frequency band and the fiber diameter are determined, the optimal porosity of the metal fibrous porous material with high-efficiency noise absorption performance can be obtained by the design method. The metal fibrous porous material obtained by the design method can meet the noise absorption requirement of the specific frequency band and can be widely applied to noise control in rail traffic, aerospace, automobiles, machining operation and experimental places.

Description

technical field [0001] The invention relates to a design method of a metal fiber porous material applied to noise control, the obtained metal fiber porous material and a preparation method thereof, and belongs to the technical field of design and processing of sound-absorbing materials. Background technique [0002] It is often difficult or even impossible to obtain a high material sound absorption coefficient at the frequency of the full audible sound spectrum (20-20000 Hz). Moreover, the noise and vibration concerned in practical engineering are often a certain (or several) fixed frequency or a certain (or several) specific frequency range. Therefore, it is of more practical significance to develop a material with high absorption performance for noise of a specific frequency or frequency range. [0003] Studies have found that the microchannel structure of porous materials has a viscous effect on sound waves, and this viscous effect is represented as acoustic resistance o...

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Problems solved by technology

[0005] At present, there is no effective design method for the microstructure of porous metal fiber materials. The design of porous metal fiber sound-absorbing materials is still mainly based on trial production, that is, to find the microstructure of the material through continuous experiments. Optimize the sound absorption performance of the material in a specific frequency band, and have the disadvantages of high cost and low sound absorption performance of the material

Chinese patent CN101740022A "A Metal Fiber Gradient Pore Sound Absorbing Material and Its Preparation Method" adopts the superimposition of multiple layers of metal materials with different porosities to improve the performance of the sound absorbing material, but does not give the optimal porosity calculation method

A comprehensive analysis found that the biggest obstacle to the improvement of the sound absorption performance of porous metal fiber materials lies in the lack of an effective microstructure design method for porous metal fiber materials to determine the optimal porosity of the material so that the material has the highest porosity in a specific frequency band. Sound absorption efficiency

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