(东南大学 材料科学与工程学院 江苏省先进金属材料高技术研究重点实验室，南京 210096)
摘 要: 以降低语音系统气流噪声为目标，制备小孔径(d0.1~0.5 mm)多孔铝合金，采用自制设备研究多孔铝合金的厚度、孔径及气流速度等因素对气流噪声的影响。结果表明：相对于孔的气流噪声，多孔铝合金的气流噪声在低频段下降18 dB，降幅随频率增加而减小；材料厚度越大、孔径越小、气流速度越大，多孔铝合金的防风降噪性能越好。
关键字: 多孔铝合金；多孔材料；降噪；气流噪声
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
