ACOUSTIC ABSORPTION CHARACTERISTICS OF FOAMED ALUMINUM
HAN FU-SHENG (韩福生)a, ZHU ZHEN-GANG (朱震刚)a, LIU CHANG-SONG (刘长松)a, ZHENG DA-RUI (郑大瑞)b, CAI XIU-LAN (蔡秀兰)b
a State Key Laboratory of Internal Friction and Defects in Solids, Institute of Solid State Physics, Academia Sinica, Hefei 230031, China; b Institute of Acoustics, Academia Sinica, Beijing 100080, China
Abstract The acoustic absorption characteristics of foamed aluminum and the effect of its structural parameters on the characteristics have been in vestigated. The results indicate that the acoustic absorption behavior of foamed aluminum has an uncertain relation with its porosity, the effect of pore size is non-monotonous, while the flow resistance, which characterizes the structural coefficients, might be the most important factor. It is also found that the absorption peak is widened and the noise reduction coefficient can be increased through suitable compressive deformation.
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