ACOUSTIC ABSORPTION CHARACTERISTICS OF FOAMED ALUMINUM

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.