错缝结构对隔墙传声损失的影响研究

The effect of staggered slit structure on the sound transmission loss of partition wall

缝隙的存在一直制约着传统隔墙结构隔声性能的提高。以错缝双层石膏板结构为研究对象,分别研究了错缝深度和错缝距离对隔墙传声损失的影响。结果表明,错缝结构比直缝结构具有更好的隔声性能;缝隙深度的影响主要取决于隔墙面密度和声波传播路径的变化;而当错缝距离与隔墙厚度接近时,其隔声量最高,这是由于声能在墙体和错缝缝隙中的透射程度相当,从而弥补了缝隙在隔墙结构中的透声"短板"。

The existence of slits has restricted the improvement of sound insulation performance of the conventional partition wall structure. The sound transmission loss of partition wall under the existence of slits is studied. The effects of the staggered slit depth and the staggered slit distance on the sound transmission loss of partition wall are analyzed. The experimental results show that the sound insulation performance of the plasterboard whole component with the staggered slits is better than that with the straight slits. The effect of the staggered slit depth depends on the variations of the surface density of partition wall structure and the sound wave propagation path. When the staggered slit distance is close to the partition wall thickness, the sound insulation performance of the partition wall reaches the best. The reason might be explained is that the transmission degree of sound energy through the wall is quite equal to that through the staggered slits, which makes up for the ＂short board＂ of sound transmission in the partition wall structure with slits.