泡沫不锈钢加穿孔板复合结构的低频吸声效果研究

Sound absorption effect of stainless steel foam plus perforated plate at low frequencies

利用高温真空烧结方法成功制备出了泡沫不锈钢及其穿孔板夹合结构样品。通过XRD、SEM分析样品烧结前后成分变化和烧结情况,可以看出,泡沫不锈钢样品在烧结前后成分一致,且烧结情况良好。运用JTZB吸声系数测试系统对泡沫不锈钢样品以及泡沫不锈钢加入穿孔板所组成的复合结构样品进行了低频声学测试,通过比较两者的吸声系数,研究穿孔板复合结构对样品吸声性能的影响。结果显示,加入穿孔板可以增大样品吸声系数,而穿孔板的数量以及类型的不同,都会使样品的共振频率随之改变。

Stainless steel foam plus perforated plate samples were prepared by high temperature vacuum sintering method. The composition changes and sintering situation of samples before and after sintering were analyzed by XRD and SEM. The results show that the composition of stainless steel foam does not change after sintering and the sintering is well conductedee. The sound absorption coefficient of stainless steel foam samples and stainless steel foam plus perforated plate samples was measured by JTZB sound absorption coefficient test system. The effect of plus perforated plate on sound absorption property was researched by comparing the sound absorption coefficient of the two samples. It is concluded that sound absorption coefficient of sample increases when perforated plate is added to stainless steel foam,and the resonance frequency of sample varies with the quantity and type of perforated plate.