摘要
三维网状泡沫金属本身的吸声性能不佳,引入空腔后有所提高,但效果仍不理想。在孔隙率为89%、厚度为2.3 cm、平均孔径为0.57 cm的网状泡沫镍复层结构的基础上,同时引进穿孔板和空腔,使所得复合结构的吸声性能有了较满意的结果。通过驻波管法测定复合结构在声频200~2 000 Hz范围内的吸声系数,发现单纯在前面贴合穿孔薄板,泡沫镍结构的吸声性能可在一定程度上提高,但效果仍不明显。在前面贴合穿孔薄板的同时,又在后面加入空腔,则泡沫镍结构的吸声性能可明显提高：双层泡沫镍加5 cm空腔的结构,吸声系数在1 000 Hz左右达到了0.68。
Three dimensional network foamed metal has poor sound absorption performance even after it is improved by the introduction of the cavity. Based on the multilayer structure of the foamed nickel with porosity at 89%,2. 3 cm in thickness and 0. 57 cm in average pore diameter,a simultaneous introduction of perforated sheet and cavity makes the composite structure a satisfactory performance in the sound absorption. The absorption coefficient of the composite structure is determined through a standing wave tube method for the sound wave frequency ranging between 200 ~ 2 000 Hz,and the sound absorption performance of the foamed nickel structure is found to be improved to a certain extent by simply attaching a perforated sheet in the front,but the effect is not obvious. However,attaching both a perforated sheet in the front and a cavity in the back could allow for a remarkable improvement in the sound absorption performance of the foamed nickel structure： the sound absorption coefficient of the structure of double-layer foamed nickel with 5 cm plus in cavity arrive at 0. 68 around 1 000 Hz.
出处
《北京信息科技大学学报（自然科学版）》
2015年第5期1-5,共5页
Journal of Beijing Information Science and Technology University
基金
北京师范大学测试基金资助(C15)
关键词
多孔材料
泡沫金属
泡沫镍
吸声系数
porous material
foamed metal
foamed nickel
sound absorption coefficient
