Sound absorption property of open-pore aluminum foams
(1.黑龙江省哈尔滨市哈尔滨工业大学材料科学与工程学院
2.山西省太原市太原理工大学材料科学与工程学院
3.Department of Materials Science and Engineering, Taiyuan University of Science and Techonology, Taiyuan 030024, China)
2.山西省太原市太原理工大学材料科学与工程学院
3.Department of Materials Science and Engineering, Taiyuan University of Science and Techonology, Taiyuan 030024, China)
Abstract: The sound absorption property of aluminum foam was studied by testing its sound absorption coefficients using standing wave tube method. The open-pore aluminum foams were prepared by infiltration process, with pore size of 0.5 mm to 3.2 mm and porosity of 54.2% to 77%. The frequency of indicted sound wave was ranging from 125 Hz to 10 kHz. The results show that the average values of sound absorption coefficients are all over 0.4 and the aluminum foam has better sound absorption property, its coefficients is influenced by frequency and pore structure, and reaches the maximum at about 1 kHz, with increasing porosity and decreasing cell diameter the sound absorption coefficient values increase.
Key words: aluminum foam; sound absorption property; sound absorption coefficient; pore structure