金屬纖維多孔材料復(fù)合結(jié)構(gòu)的聲學(xué)性能
[Abstract]:In order to solve the problem of noise treatment in confined space in the fields of precision electronic components, 316L stainless steel fiber with a diameter of 8 渭 m or 20 渭 m is used as raw material. The porous material of stainless steel fiber with thickness of 2 mm and porosity of 55% was prepared by vacuum sintering technique, and then the composite structure of 3 mm thickness 4 mm was prepared by vacuum sintering technology, which was combined with perforated plate and sheet metal. The sound absorption coefficient and sound insulation of metal fiber porous material and its composite structure were measured by 4206 type acoustic impedance tube. The influences of porosity and fiber diameter of stainless steel fiber porous material, structure parameters of perforated plate and metal sheet on sound absorption and sound insulation of composite structure were systematically analyzed. The results show that when the thickness of metal fiber porous material is 2 mm, the single layer composite structure should be selected for noise treatment, and the sound absorption coefficient is stable at 0.3 ~ 0. 4. When the acoustic frequency exceeds 3000 Hz, the gradient composite structure should be chosen for noise treatment. The maximum sound absorption coefficient is 0.75. The perforated plate significantly increases the sound absorption coefficient of the composite structure. Compared with the perforated plate structure, the composite structure moves the first resonance frequency to the low frequency direction and widens the sound absorption band near the resonant frequency. The sound absorption coefficient can be further improved by adding metal sheet between layers of gradient metal fiber porous materials.
【作者單位】: 西北有色金屬研究院金屬多孔材料國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】:國(guó)家自然科學(xué)基金資助項(xiàng)目(51301141) 陜西省科技創(chuàng)新團(tuán)隊(duì)(2015KCT-11) 陜西省科技統(tǒng)籌創(chuàng)新工程計(jì)劃項(xiàng)目(2016KTCQ01-111)
【分類號(hào)】:TB535.1
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