全(quan)封(feng)閉聲屏(ping)障屏(ping)體使(shi)用的是(shi)鍍鋅板(ban)，鋁板(ban)，這種面(mian)板(ban)板(ban)材上(shang)布滿(man)小孔(kong)，聲波撞到聲屏(ping)障，就(jiu)有可能(neng)陷(xian)到孔(kong)內，而板(ban)材中(zhong)部(bu)是(shi)*層厚厚的吸音棉(mian)，噪音陷(xian)進內部(bu)去(qu)不容易出來(lai)，吸音棉(mian)外敷無堿恨水玻璃布，屏(ping)體表面(mian)可實施噴塑處理，防腐性強，使(shi)用壽命長。

聲(sheng)(sheng)(sheng)波在(zai)傳播(bo)過程中遇到(dao)(dao)全封閉聲(sheng)(sheng)(sheng)屏(ping)障(zhang)(zhang)時，就應該(gai)能(neng)(neng)產生了反(fan)射、透(tou)(tou)射和(he)繞射三種現象。大(da)致屏(ping)障(zhang)(zhang)能(neng)(neng)夠(gou)(gou)阻止直達(da)聲(sheng)(sheng)(sheng)的傳播(bo)，并使透(tou)(tou)射聲(sheng)(sheng)(sheng)有足夠(gou)(gou)的衰減，而透(tou)(tou)射聲(sheng)(sheng)(sheng)的影響可以忽略(lve)不計。對此，聲(sheng)(sheng)(sheng)屏(ping)障(zhang)(zhang)的隔聲(sheng)(sheng)(sheng)效(xiao)果(guo)通常可采用減噪(zao)量表示，它反(fan)映了聲(sheng)(sheng)(sheng)屏(ping)障(zhang)(zhang)上面(mian)介紹兩種屏(ping)蔽透(tou)(tou)聲(sheng)(sheng)(sheng)的本領。在(zai)聲(sheng)(sheng)(sheng)源和(he)接(jie)收(shou)點(dian)之間插入同(tong)*個(ge)(ge)聲(sheng)(sheng)(sheng)屏(ping)障(zhang)(zhang)，設屏(ping)障(zhang)(zhang)無限長(chang)，聲(sheng)(sheng)(sheng)波僅能(neng)(neng)從屏(ping)障(zhang)(zhang)上方(fang)繞射以前，而在(zai)其后形成同(tong)*個(ge)(ge)聲(sheng)(sheng)(sheng)影區，就象光線被物(wu)體遮(zhe)擋形成同(tong)*個(ge)(ge)陰影那樣(yang)。在(zai)這(zhe)個(ge)(ge)聲(sheng)(sheng)(sheng)影區內，人們可以感到(dao)(dao)噪(zao)聲(sheng)(sheng)(sheng)明顯地減弱(ruo)了，這(zhe)則是聲(sheng)(sheng)(sheng)屏(ping)障(zhang)(zhang)的減噪(zao)效(xiao)果(guo)。