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重慶無機纖維噴涂 > 新聞動態 > 常見問題 > 重慶纖維噴涂廠家:告訴你為什么要用兩層隔音板
重慶纖維噴涂廠家:告訴你為什么要用兩層隔音板
編輯 : 重慶纖維噴涂廠家    2017-07-11 08:56:40


重慶纖維噴涂廠家:告訴你為什么要用兩層隔音板。對于單層板墻來說,為了提高隔聲效果,單靠增加質量,則不僅需要增加大量材料,而且增加結構的自重會使建筑基礎的造價提高,以及建筑使用面積的減少。

比如為了使單層板墻的隔聲量提高12dB,則板墻的質量要增加四倍,即板墻的厚度增加四倍。采取這種方法來達到隔聲量的較大提高是既不經濟也不現實的。

如果把兩個單層板墻中間留一定的間距,有時把兩墻之間的空氣層稱為空腔就形成雙層隔聲結構。比如把24cm厚的單層一磚墻,砌筑成中間留有空氣層的12cm厚的兩個半磚墻,就形成一種典型的雙層隔聲結構。

在雙層隔聲結構中,其聲波的傳播過程中,首先從右邊入射到到第一層板墻上的聲波為Eil,一部分被反射的聲波為Erl,一部分被第一層板墻所吸收的聲波為Eal,它將成為第二層板墻的入射波Ei2=E2.這就是聲波在雙層隔聲結構中的傳播過程。

聲波從第一層墻入射經兩墻之間的空腔到第二層傳出的透射波,由于入射波經過兩次的反射以及墻內的損耗,使聲波獲得較大的衰減,從而使隔聲性能提高。

雙層墻隔聲結構,由于兩墻之間封閉的空氣層具有一定的彈性,因此可把它看成“質量-彈簧-質量”組成的振動系統,入射聲波使第一層墻產生振動,并向兩墻中間的空氣層輻射聲音,空氣層中的聲波入射到第二層墻,并使其產生振動而向外輻射聲音。由于空氣層的彈性起減振作用,第二層墻振動的減小使其向外輻射的聲音也減小,從而使隔聲性能提高。


本文編輯:重慶纖維噴涂廠家(網址:http://www.boladedragoncenter.com/


以上就是重慶纖維噴涂廠家小編為你介紹的為什么要用兩層隔音板,希望能給你帶來幫助。如您還想獲取更多相關資訊,敬請關注重慶纖維噴涂廠家!



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