单座容积超大型厅堂顶部材料吸声效率的研究

Research on absorbing efficiency of ceiling material in hall with huge value of volume per seat

单座容积超过国家标准推荐上限值两倍及以上的厅堂定义为超大型厅堂,这类厅堂在观演建筑中越来越多。在超大型厅堂的音质设计中,为了控制厅堂内的混响时间,顶部往往需要布置吸声材料。借助厅堂音质计算机模拟分析软件,以三个超大型厅堂模型的混响时间为例,探讨了吸声材料布置在顶部时的吸声效率。研究结果表明,顶部材料的吸声效率与声源到顶面的距离和声源的频率均呈负相关,而材料自身的吸声系数对顶部吸声效率的影响较小。

More and more art performing buildings with huge value of volume per seat which values of volume per seat are at less twice higher than standard value are building.During the process of acoustics design of hall with huge value of volume per seat,absorbing materials are always installed on ceiling for the purpose of reverberation time control.In this paper,absorbing efficiency of ceiling material is studied based on computer simulation results of reverberation time in three models of halls with huge value of volume per seat.It shows that the absorbing efficiency of ceiling material is negative correlation both with the distance from sound source to the ceiling and the frequency.But it is little affected by sound absorption coefficient of ceiling material.