The roof system consists of main purlin, bottom plate, secondary purlin, absorption sound layer, insulating layer and faceplate.
屋面系统由主檩条、底板、次檩条、吸音层、保温层和面板组成。
Its good characteristics include low cost high durability and good property of sound absorption.
它具有成本低、耐久性高、吸声性能好的特点。
The result shows that average absorption coefficient and noise reduction coefficient separately equal to0.58and0.60 and fine property of sound absorption at middle-low frequency.
结果表明材料的平均吸声系数和降噪系数分别达0。58和0。60，且材料的中低频吸声性能优良。
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