Transmission Loss of Metallic Foams for the Local Resonance

In order to explore a new material of noise pollution control, transmission loss of metallic foams was analyzed for local resonance. And a model on sound insulation loss of the closed-cell metallic foams plate was presented on base of the former and correlative theory. The results show that sound insulation property of the closed-cell metallic foams plate is a biggish change with the different parameters. And it is found that sound insulation loss of the closed-cell metallic foams plate has an extreme value to the some frequency. It is reckoned that there is a phenomenon of the brush-fire sympathetic vibration in closed-cell metallic foams plate. The resonance may sometimes greatly improve the effect of sound insulation. The result will be very important to future engineering application of the closed-cell metallic foams plate.