Sound absorption property of openpore aluminum foams

摘要

This paper presents a study on sound absorption property of aluminum foam by evaluating itssound absorption coefficients using standing wave tube method. Experimental results showed that the averagevalues of sound absorption coefficients (over the test frequency range) are all above 0.4, which indicate verygood sound absorption property of the aluminum foams. The sound absorption coefficient is affected by frequencyand pore structure, and reaches its maximum value at around 1 000 Hz. With the increase of porosity anddecrease of cell diameter, the sound absorption coefficient values increase