GOST 31287-2005 Noise Guidelines for noise control in workrooms by means of acoustical screens《噪声 车间内由声屏障控制噪声的指南》.pdf

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6、() . , () . , .3.6 R,soundreductionindex(transmissionloss): ,- , , , .3.7 Dz,(free-field screen attenuation): - ( - ) - , Dz=10lg 340c43c230c232c231c246c248c247zc108,(1)z , ;c108 c f ,.1 Dz,r, , , , - Dz,r= 101g 120c43c230c232c231c246c248c247zc108.(2) Dz, r35Dz.2 , (, , ), 1.,-,/.4 :A , 2(5.3);c97 (

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