亚洲一区二区三区国产精华液_国产又黄又大又粗视频_国产欧美久久久久久精品一区二区_欧美兽交XXXX×视频

　 消(xiao)(xiao)音(yin)器(qi)(qi)(qi)主要是利(li)用多孔(kong)吸聲(sheng)(sheng)(sheng)(sheng)材(cai)料來降低噪(zao)聲(sheng)(sheng)(sheng)(sheng)的。把吸聲(sheng)(sheng)(sheng)(sheng)材(cai)料固(gu)定在氣流(liu)通道的內壁(bi)上或按照一定方式在管道中排列，就構成了阻(zu)(zu)性(xing)消(xiao)(xiao)音(yin)器(qi)(qi)(qi)。當聲(sheng)(sheng)(sheng)(sheng)波(bo)(bo)進入阻(zu)(zu)性(xing)消(xiao)(xiao)音(yin)器(qi)(qi)(qi)時，一部(bu)分(fen)聲(sheng)(sheng)(sheng)(sheng)能(neng)在多孔(kong)材(cai)料的孔(kong)隙中摩(mo)擦(ca)而轉(zhuan)化(hua)成熱能(neng)耗散掉(diao)，使通過消(xiao)(xiao)音(yin)器(qi)(qi)(qi)的聲(sheng)(sheng)(sheng)(sheng)波(bo)(bo)減弱。阻(zu)(zu)性(xing)消(xiao)(xiao)音(yin)器(qi)(qi)(qi)就好象電學上的純電阻(zu)(zu)電路(lu)，吸聲(sheng)(sheng)(sheng)(sheng)材(cai)料類似(si)于(yu)電阻(zu)(zu)。因(yin)此，人們(men)就把這(zhe)種消(xiao)(xiao)音(yin)器(qi)(qi)(qi)稱為阻(zu)(zu)性(xing)消(xiao)(xiao)音(yin)器(qi)(qi)(qi)。阻(zu)(zu)性(xing)消(xiao)(xiao)音(yin)器(qi)(qi)(qi)對中高頻(pin)消(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)效(xiao)果(guo)好、對低頻(pin)消(xiao)(xiao)聲(sheng)(sheng)(sheng)(sheng)效(xiao)果(guo)較(jiao)差。