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 消(xiao)音(yin)(yin)器(qi)(qi)(qi)(qi)主(zhu)要(yao)是利(li)用多孔(kong)吸(xi)聲(sheng)(sheng)(sheng)材料(liao)來降低(di)噪聲(sheng)(sheng)(sheng)的(de)。把吸(xi)聲(sheng)(sheng)(sheng)材料(liao)固定在(zai)氣流通道的(de)內(nei)壁上或(huo)按照一(yi)定方式在(zai)管道中排列，就(jiu)(jiu)構(gou)成(cheng)了阻性(xing)(xing)消(xiao)音(yin)(yin)器(qi)(qi)(qi)(qi)。當聲(sheng)(sheng)(sheng)波(bo)(bo)進入阻性(xing)(xing)消(xiao)音(yin)(yin)器(qi)(qi)(qi)(qi)時，一(yi)部分聲(sheng)(sheng)(sheng)能在(zai)多孔(kong)材料(liao)的(de)孔(kong)隙中摩擦而轉化成(cheng)熱能耗散掉，使通過(guo)消(xiao)音(yin)(yin)器(qi)(qi)(qi)(qi)的(de)聲(sheng)(sheng)(sheng)波(bo)(bo)減弱。阻性(xing)(xing)消(xiao)音(yin)(yin)器(qi)(qi)(qi)(qi)就(jiu)(jiu)好(hao)象(xiang)電(dian)學上的(de)純電(dian)阻電(dian)路，吸(xi)聲(sheng)(sheng)(sheng)材料(liao)類似于電(dian)阻。因(yin)此，人們就(jiu)(jiu)把這種(zhong)消(xiao)音(yin)(yin)器(qi)(qi)(qi)(qi)稱為(wei)阻性(xing)(xing)消(xiao)音(yin)(yin)器(qi)(qi)(qi)(qi)。阻性(xing)(xing)消(xiao)音(yin)(yin)器(qi)(qi)(qi)(qi)對(dui)中高頻(pin)消(xiao)聲(sheng)(sheng)(sheng)效(xiao)果好(hao)、對(dui)低(di)頻(pin)消(xiao)聲(sheng)(sheng)(sheng)效(xiao)果較差(cha)。