Mechanism Analysis of Sound Absorption in Perforated Closed-Cell Aluminum Foam
Received:April 09, 2016  Revised:April 15, 2016
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KeyWord:closed-cell aluminum foam; sound absorption; perforation; mechanism
LIANG Li-si 西安建筑科技大学大学 冶金工程学院 陕西 西安
ZHAO Zhong-yu 西安建筑科技大学大学 冶金工程学院 陕西 西安
ZHANG Shao-hua 西安建筑科技大学大学 冶金工程学院 陕西 西安
YU Ze-li 西安建筑科技大学大学 冶金工程学院 陕西 西安
WU Xiao-lei 西安建筑科技大学大学 冶金工程学院 陕西 西安
LIU Shi-wei 西安建筑科技大学大学 冶金工程学院 陕西 西安
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      Sound absorption coefficients of closed-cell aluminum foam board, perforated closed-cell aluminum foam board, and perforated ordinary aluminum board were measured respectively by Standing Wave Tube Tester to investigate structure characteristics of perforated closed-cell aluminum foam board and mechanism of sound absorption based on characteristic curve of resonance structure sound absorption. The results show that sound absorption coefficient peak value of perforated closed-cell aluminum foam is 0.68, which is higher than that of unperforated closed-cell aluminum foam board of 0.42 and perforated ordinary aluminum board of 0.45. Noise reduction coefficient also rises. Mechanism of sound absorption of perforated closed-cell aluminum foam includes noise elimination by interference of surface diffuse reflection, energy dissipation of acoustic waves caused by internal micro holes and cracks, resonance structure formed between hole and back board, and structure change of inner hole.