全(quan)封閉聲屏障(zhang)屏體使用的是鍍(du)鋅板，鋁板，這種(zhong)面(mian)板板材(cai)上布滿小孔(kong)，聲波撞到(dao)聲屏障(zhang)，就有(you)可(ke)能陷(xian)到(dao)孔(kong)內，而板材(cai)中部(bu)是*層厚厚的吸(xi)(xi)音棉(mian)，噪音陷(xian)進內部(bu)去不容(rong)易出(chu)來，吸(xi)(xi)音棉(mian)外敷無(wu)堿恨(hen)水玻璃布，屏體表面(mian)可(ke)實施噴(pen)塑處理，防腐性強(qiang)，使用壽命長。

聲(sheng)(sheng)波在(zai)傳播(bo)過(guo)程(cheng)中遇到全封(feng)閉聲(sheng)(sheng)屏(ping)(ping)障(zhang)(zhang)時(shi)，就應該(gai)能產生了反射、透射和繞射三種現象(xiang)。大致屏(ping)(ping)障(zhang)(zhang)能夠阻止(zhi)直達(da)聲(sheng)(sheng)的傳播(bo)，并使透射聲(sheng)(sheng)有足夠的衰減(jian)(jian)，而透射聲(sheng)(sheng)的影(ying)(ying)響可(ke)(ke)以(yi)忽略不計。對此，聲(sheng)(sheng)屏(ping)(ping)障(zhang)(zhang)的隔聲(sheng)(sheng)效(xiao)果通常可(ke)(ke)采用減(jian)(jian)噪量表(biao)示，它反映了聲(sheng)(sheng)屏(ping)(ping)障(zhang)(zhang)上面介紹(shao)兩種屏(ping)(ping)蔽透聲(sheng)(sheng)的本領。在(zai)聲(sheng)(sheng)源和接收點之間插(cha)入(ru)同(tong)(tong)*個聲(sheng)(sheng)屏(ping)(ping)障(zhang)(zhang)，設屏(ping)(ping)障(zhang)(zhang)無限長(chang)，聲(sheng)(sheng)波僅能從屏(ping)(ping)障(zhang)(zhang)上方繞射以(yi)前(qian)，而在(zai)其后(hou)形成(cheng)同(tong)(tong)*個聲(sheng)(sheng)影(ying)(ying)區(qu)(qu)，就象(xiang)光線被物體遮擋形成(cheng)同(tong)(tong)*個陰影(ying)(ying)那(nei)樣。在(zai)這(zhe)個聲(sheng)(sheng)影(ying)(ying)區(qu)(qu)內，人們(men)可(ke)(ke)以(yi)感(gan)到噪聲(sheng)(sheng)明顯地減(jian)(jian)弱了，這(zhe)則(ze)是(shi)聲(sheng)(sheng)屏(ping)(ping)障(zhang)(zhang)的減(jian)(jian)噪效(xiao)果。