摘要
闭孔泡沫铝板具有一定的吸声性能,对闭孔泡沫铝板进行打孔处理后,其吸声效果显著提高。使用驻波管法测试不同打孔率以及在泡沫铝板背后设置不同厚度空腔时吸声系数和吸声频率的变化。测量结果表明:以适当的打孔率打孔后,吸声系数提高30%左右,打孔率过高,吸声系数反而降低;随着在泡沫铝吸声板后设置的空腔厚度的增加,吸声峰值向低频偏移。可通过改变打孔率和背后空腔深度来设计用于降噪的闭孔泡沫铝吸声结构。
The closed-cell aluminum foam panels have certain sound absorption properties,which are significantly increased by perforating the aluminum foam panels. The sound absorption properties were studied from the perforation rate,cavity thickness with standing waves tube. The results show that the sound absorption coefficient of closed-cell aluminum foam increases by 30% after being perforated. However,when the perforation rate exceeds a certain value,the sound absorption coefficient decreases. Moreover,the highest sound absorption coefficient shows the trend of traveling to low-frequency region with increasing the cavity thickness.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2010年第12期2372-2376,共5页
The Chinese Journal of Nonferrous Metals
基金
国家高技术研究发展计划资助项目(2008AA032512)
国家自然科学基金资助项目(50774021)
关键词
吸声
闭孔泡沫铝
打孔
空腔
sound absorption
closed-cell aluminum foam
perforation
cavity
