全封閉聲(sheng)(sheng)屏障屏體使(shi)用(yong)的是(shi)鍍鋅板(ban)，鋁板(ban)，這種(zhong)面(mian)(mian)板(ban)板(ban)材(cai)上布(bu)滿小孔，聲(sheng)(sheng)波撞到聲(sheng)(sheng)屏障，就有可(ke)能陷(xian)到孔內，而板(ban)材(cai)中部是(shi)*層厚厚的吸音棉，噪音陷(xian)進內部去(qu)不容易出來，吸音棉外敷無堿恨水玻璃布(bu)，屏體表面(mian)(mian)可(ke)實施噴塑(su)處(chu)理，防腐性強，使(shi)用(yong)壽命長。

聲(sheng)(sheng)(sheng)(sheng)(sheng)波(bo)在(zai)傳(chuan)播(bo)過程中遇到全封閉聲(sheng)(sheng)(sheng)(sheng)(sheng)屏(ping)障時，就應該能(neng)產生(sheng)了(le)(le)反(fan)射(she)(she)、透(tou)射(she)(she)和繞射(she)(she)三種(zhong)現(xian)象(xiang)。大致屏(ping)障能(neng)夠阻(zu)止直達聲(sheng)(sheng)(sheng)(sheng)(sheng)的(de)(de)傳(chuan)播(bo)，并使透(tou)射(she)(she)聲(sheng)(sheng)(sheng)(sheng)(sheng)有足夠的(de)(de)衰減，而(er)透(tou)射(she)(she)聲(sheng)(sheng)(sheng)(sheng)(sheng)的(de)(de)影響可以(yi)忽略(lve)不計。對(dui)此，聲(sheng)(sheng)(sheng)(sheng)(sheng)屏(ping)障的(de)(de)隔(ge)聲(sheng)(sheng)(sheng)(sheng)(sheng)效果通常可采用減噪量(liang)表示，它(ta)反(fan)映了(le)(le)聲(sheng)(sheng)(sheng)(sheng)(sheng)屏(ping)障上面介紹兩種(zhong)屏(ping)蔽透(tou)聲(sheng)(sheng)(sheng)(sheng)(sheng)的(de)(de)本領。在(zai)聲(sheng)(sheng)(sheng)(sheng)(sheng)源(yuan)和接收點之間(jian)插入同(tong)*個(ge)聲(sheng)(sheng)(sheng)(sheng)(sheng)屏(ping)障，設屏(ping)障無限長(chang)，聲(sheng)(sheng)(sheng)(sheng)(sheng)波(bo)僅能(neng)從屏(ping)障上方繞射(she)(she)以(yi)前，而(er)在(zai)其后形成(cheng)(cheng)同(tong)*個(ge)聲(sheng)(sheng)(sheng)(sheng)(sheng)影區，就象(xiang)光線被物體(ti)遮擋形成(cheng)(cheng)同(tong)*個(ge)陰影那樣(yang)。在(zai)這個(ge)聲(sheng)(sheng)(sheng)(sheng)(sheng)影區內，人們可以(yi)感(gan)到噪聲(sheng)(sheng)(sheng)(sheng)(sheng)明顯地減弱(ruo)了(le)(le)，這則是聲(sheng)(sheng)(sheng)(sheng)(sheng)屏(ping)障的(de)(de)減噪效果。