10 拡散音場より開口する円孔及びスリットからの自由空間内減衰勾配について

概要

論文の詳細を見る
Assuming a opening from diffused sound field has the nature as though it is a plane-like assembly of non directional point sources, I analized the sound intensity attenuation along the perpendicular centre line from circular and slit-like openings and then proved experimentaly the analized logical formulas of attenuation are resonable for practical use, and for all frequencies. Some of the important results of this investigation are; 1. Ratio of sound intensity from circular opening is log_e{1+(R/l)^2}. R: radius of circular opening from diffused field. l: distance of receiving point from the opening. 2. Ratio of sound intensity from slit-like opening is 1/l tan^<-1> b/<2l> b: length of slit when the length of slit is much larger than width of it. l: distance of receiving point from the opening. 3. Sound intensity from point source (for circular opening when R/l<0.25, for slit-like one when b/2l<1) attenuats by 1/l^2 law. But sound intensity from line source (for slit b/2l>3) attenuats by 1/l law and for plane source attenuation by distance of receiving point is very little.
社団法人日本建築学会の論文
1960-03-25