巖棉板高端保溫及(ji)吸聲性能如何？ 

高(gao)(gao)端(duan)保溫巖(yan)棉(mian)板對聲(sheng)音中高(gao)(gao)頻有較好的(de)(de)吸(xi)聲(sheng)性能(neng)(neng)(neng)。影(ying)(ying)響高(gao)(gao)端(duan)保溫巖(yan)棉(mian)板吸(xi)聲(sheng)性能(neng)(neng)(neng)的(de)(de)主要因(yin)素是(shi)厚度、密(mi)度和空(kong)(kong)氣(qi)流阻(zu)等。密(mi)度是(shi)每(mei)立方(fang)米材(cai)料(liao)的(de)(de)重量。空(kong)(kong)氣(qi)流阻(zu)是(shi)單位厚度時材(cai)料(liao)兩側(ce)空(kong)(kong)氣(qi)氣(qi)壓和空(kong)(kong)氣(qi)流速之比。空(kong)(kong)氣(qi)流阻(zu)是(shi)影(ying)(ying)響高(gao)(gao)端(duan)保溫巖(yan)棉(mian)板吸(xi)聲(sheng)性能(neng)(neng)(neng)最重要的(de)(de)因(yin)素。流阻(zu)太(tai)小，說明材(cai)料(liao)稀疏，空(kong)(kong)氣(qi)振動容(rong)易穿(chuan)過，吸(xi)聲(sheng)性能(neng)(neng)(neng)下降(jiang);流阻(zu)太(tai)大(da)，說明材(cai)料(liao)密(mi)實，空(kong)(kong)氣(qi)振動難(nan)于(yu)傳入，吸(xi)聲(sheng)性能(neng)(neng)(neng)亦下降(jiang)。對于(yu)高(gao)(gao)端(duan)保溫巖(yan)棉(mian)板來講，吸(xi)聲(sheng)性能(neng)(neng)(neng)存在最佳流阻(zu)。在實際(ji)工程中，測定(ding)空(kong)(kong)氣(qi)流阻(zu)比較困難(nan)，但可以通過厚度和容(rong)重粗略估計和控制(zhi)。  

1、隨著(zhu)(zhu)厚度(du)增(zeng)加，中低頻(pin)吸聲系數顯著(zhu)(zhu)地增(zeng)加，但(dan)高頻(pin)變化不大。  

2、厚度不變，容重增加，中低頻吸聲系數亦增加;但當容重增加到一定程度時，材料變得密實，流阻大于最佳流阻，吸聲系數反而下降。對于厚度超過5cm的容重為16Kg/m3的離心玻璃棉，低(di)頻(pin)(pin)125hz約為0.2，中高頻(pin)(pin)的(de)吸(xi)(xi)聲(sheng)(sheng)系數已經接(jie)近于(yu)1了(le)。當(dang)厚度(du)由5cm繼續增大(da)(da)時(shi)(shi)(shi)，低(di)頻(pin)(pin)的(de)吸(xi)(xi)聲(sheng)(sheng)系數逐漸提高，當(dang)厚度(du)大(da)(da)于(yu)1m以上時(shi)(shi)(shi)，低(di)頻(pin)(pin)125hz的(de)吸(xi)(xi)聲(sheng)(sheng)系數也將(jiang)(jiang)接(jie)近于(yu)1。當(dang)厚度(du)不(bu)變，容(rong)(rong)重(zhong)(zhong)(zhong)增大(da)(da)時(shi)(shi)(shi)，高端(duan)保溫(wen)巖棉板(ban)的(de)低(di)頻(pin)(pin)吸(xi)(xi)聲(sheng)(sheng)系數也將(jiang)(jiang)不(bu)斷提高，當(dang)容(rong)(rong)重(zhong)(zhong)(zhong)接(jie)近110kg/m3時(shi)(shi)(shi)吸(xi)(xi)聲(sheng)(sheng)性(xing)能(neng)(neng)達到最大(da)(da)值(zhi)，50mm厚、頻(pin)(pin)率(lv)125hz處接(jie)近0.60.7。容(rong)(rong)重(zhong)(zhong)(zhong)超過120kg/m3時(shi)(shi)(shi)，吸(xi)(xi)聲(sheng)(sheng)性(xing)能(neng)(neng)反而下(xia)降，是(shi)因為材料變得致(zhi)密(mi)，中高頻(pin)(pin)吸(xi)(xi)聲(sheng)(sheng)性(xing)能(neng)(neng)受到很(hen)大(da)(da)影響，當(dang)容(rong)(rong)重(zhong)(zhong)(zhong)超過300kg/m3時(shi)(shi)(shi)，吸(xi)(xi)聲(sheng)(sheng)性(xing)能(neng)(neng)減(jian)小很(hen)多。建筑聲(sheng)(sheng)學中常用的(de)吸(xi)(xi)聲(sheng)(sheng)高端(duan)保溫(wen)巖棉板(ban)的(de)厚度(du)有3cm、5cm、10cm，容(rong)(rong)重(zhong)(zhong)(zhong)有80、100、120、140、160kg/m3。通常使用5cm厚，的(de)高端(duan)保溫(wen)巖棉板(ban)。