(東北大學(xué) 材料與冶金學(xué)院，沈陽 110089)
摘 要: 將不同打孔率、厚度、打孔方式的閉孔泡沫鋁板與玻璃棉進(jìn)行組合，使用駐波管吸聲測試儀進(jìn)行吸聲系數(shù)測試，研究組合形式對閉孔泡沫鋁板吸聲效果的影響。結(jié)果表明，通過對吸聲峰值、降噪系數(shù)、半峰寬值的計(jì)算和比較可以看出，吸聲峰值在低頻的試樣在前、峰值在高頻的試樣在后的組合形式有利于吸聲，出現(xiàn)兩個吸聲峰，降噪系數(shù)和半峰寬值也都大大提高；打孔閉孔泡沫鋁板與玻璃棉的組合使峰值略有提高，但性能總體的改變不大，而玻璃棉本身易造成環(huán)境污染，因此，該種組合不適于在吸聲領(lǐng)域應(yīng)用。
關(guān)鍵字: 吸聲系數(shù)；泡沫鋁；玻璃棉；打孔；吸聲結(jié)構(gòu)
closed-cell aluminum foam perforated
（School of Materials and Metallurgy, Northeastern University, Shenyang 110089, China）
Abstract:The closed-cell aluminum foams with various specimen thicknesses, perforation ways and perforation rates were grouped with glass wool. The sound absorption coefficient was measured by standing-wave method, and the effect of combining form on the sound adsorption of closed-cell aluminum foam perforated was studied. The results show that, being evaluated by the maximum of sound absorption coefficient, noise reduction coefficient and half-peak breadth, the specimens with the maximum of sound absorption coefficient at low frequency should be put before the specimens with the maximum of sound absorption coefficient at high frequency, which shows two peaks of sound adsorption, and greatly increases the noise reduction coefficient and half-peak breadth. The maximum of sound absorption coefficient increases slightly in a combination of closed-cell aluminum foam perforated and glass wool. However, the glass wool is apt to cause environmental pollution. Thus, the combination is unsuitable for sound absorption.
Key words: sound absorption coefficient; aluminum foam; glass wool; perforation; sound absorption structure
