利用双层墙构造减弱吻合效应影响的方法

Approaches to Abating Coincidence Effect of Sound Insulation by Using Double-Leaf Wall Structure

双层墙以其良好的隔声效果被广泛应用于各类建筑围护结构,但这种构造存在由于吻合效应叠加而降低墙体在某些频率范围隔声性能的现象.为了避免这种吻合效应叠加现象,文中应用统计能量分析(简称SEA)理论对具体双层墙构造的隔声规律进行预测与分析,由此提出减弱此类墙体结构吻合效应的构造方法,即通过改变双层墙的材料层次序、密度和厚度来减弱吻合效应对隔声的影响.研究结果表明:利用向声源薄板的双层墙构造能够有效地减弱吻合效应叠加对隔声性能的影响;采用不同密度和厚度轻质墙体的双层墙可大幅度降低甚至消除低频和高频吻合效应.

Double-leaf wall structre with its favorable sound insulation is widely used in variety building enve- lopes. Once coincidence superposition which occurs within some frequency ranges will severely impair the sound in- sulation of this structre. For the purpose to eliminate the effects of coincidence superposition, statistical energy analysis （SEA） theory is adopted in predicting sound insulation of the specific double-leaf wall. The results indi- cate that structural coincidence effect can be predicted accurately by SEA model, therefore, the suitable double-leaf wall structres which attenuate coincidence effect are obtained, that is, the influence of the coincidence effect on the sound insulation will be abated by ahering the sequence, density and thickness of each material layer of a double- layer wall. For instance, the thin panel towards sound source can effectively reduce coincidence effect which gene- rates sound insulation deterioration of the structre and the coincidence effects at low and high frequency ranges are attenuated substantially whilst both the walls of double-leaf wall are light-weight panels.