(東南大學(xué) 材料科學(xué)與工程學(xué)院 江蘇省先進(jìn)金屬材料高技術(shù)研究重點(diǎn)實(shí)驗(yàn)室，南京 210096)
摘 要: 以降低語(yǔ)音系統(tǒng)氣流噪聲為目標(biāo)，制備小孔徑(d0.1~0.5 mm)多孔鋁合金，采用自制設(shè)備研究多孔鋁合金的厚度、孔徑及氣流速度等因素對(duì)氣流噪聲的影響。結(jié)果表明：相對(duì)于孔的氣流噪聲，多孔鋁合金的氣流噪聲在低頻段下降18 dB，降幅隨頻率增加而減小；材料厚度越大、孔徑越小、氣流速度越大，多孔鋁合金的防風(fēng)降噪性能越好。
關(guān)鍵字: 多孔鋁合金；多孔材料；降噪；氣流噪聲
small pore diameter
（Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering,
Southeast University, Nanjing 210096, China）
Abstract:Porous Al alloys with small pore diameters were fabricated for the purpose of reducing airflow noise under the sound system. The effects of thickness, pore diameter of porous material and airflow velocity on the noise were investigated experimentally. The results show that the noise of the specimen reduces by 18 dB at lower frequency and the breadth reduces with increasing frequency comparing with the noise of the hole. The airflow noise attenuation capacity of the specimens increases with increasing thickness, decreasing pore diameter and increasing airflow velocity.
Key words: porous Al alloy; porous materials; noise attenuation; airflow noise
