多孔質アルミニウム系焼結材と有孔板との吸音特性の比較

概要

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This report is tried to clarify the sound absorption character of porous sintered aluminum base sheets by vertical sound absorption method with the following samples; (1) a perforated aluminum metal sheets, (2) the perforated aluminum metal sheet having porous sintered aluminum or glasswool, (3) the porous sintered aluminum base sheets, and (4) a pore-simplified sintered aluminum base sheet prepared by paraffine treatment.<BR>From the above experiments, it can be said that the porous sintered aluminum base material has a three-dimentional structure, therefore the sound absorption curve is similar to of the perforated metal, but the former has smoother and wider sound absorption curves against the frequency than the latter.<BR>An effect of the air gap behind the porous sintered aluminum base sheet on the sound absorption was also examined. It was found that, in order to get a more good sound absorption curve in wider frequencies, it is important to set the sheet in the apparatus with some inclined air gaps against the sound waves.
社団法人粉体粉末冶金協会の論文