A Study of Acoustical Design of Under-Balcony Space in Auditoria

礼堂阳台下空间声学设计研究

基本信息

批准号：
06650657
负责人：
FUJIMOTO Kazutoshi
金额：
$ 1.28万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

The purpose of this study is to make clear the relation between the shape of balcony and acoustical properties under the overhang, and ultimately to derive an acoustic design criteria for balcony configuration is auditoria. On the assumption that a physical change of the sound field caused by building a balcony would be primarily a reduction of the energy of early reflections from upside, the directional characteristics of early reflections under the balcony is measured. The results show that the ratio of vertical component to total early reflection energy is very small under the overhang. Then psycho-acoustical experiments by using the measured data are perfoemed. The results show that auditory envelopment becomes stronger as the vertical component of reflected energy increases while lateral energy fraction is constant. Next. impulse responses are calculated in models of auditorium by means of computer simulation based on geometrical acoustics when the depth and the height of balcony-opening are varied. The evident effect of overhang can not be found in basic acoustical indices (SPL,C_<80>, TS and LE). This means that another index is necessary for evaluating the lack of auditory envelopment which is often perceived under the balcony. The directional characteristics of early reflections are examined. As a result, the relation between the configuration index of d/h and the ratio of vertical component to total early reflection energy ERv is obtained, where d and h are geometrically defined by the positions of sound source, receiving point and balcony edge. Applying the difference Iimen of ERv to this relation, it is found thet the maximum limit of d/h, in which the degree of auditory envelopment under the overhang is equivalent to that in main orchestra, is between 0.7 and 1.0. It can be thought that this is a design criteria of balcony in auditoria.

这项研究的目的是清除悬垂下阳台和声学特性的形状之间的关系，并最终得出阳台配置的声学设计标准是Auditoria。假设由建造阳台引起的声场的物理变化主要是从上升的早期反射能量减少，因此测量了阳台下早期反射的方向特征。结果表明，在悬垂下，垂直成分与总早期反射能的比率很小。然后，使用测量数据进行心理声学实验。结果表明，随着反射能量的垂直成分的增加，横向能量分数是恒定的，听觉包膜变得更强。下一个。当阳台的深度和阳台开放高度变化时，通过基于几何声学的计算机仿真在礼堂模型中计算脉冲响应。在基本的声学指数（SPL，C_ <80>，TS和LE）中找不到悬垂的明显影响。这意味着要评估缺乏听觉信封的另一个指数是经常被认为是阳台下的。研究了早期反射的定向特征。结果，获得了D/H的配置指数与垂直分量与总早期反射能量ERV的比率之间的关系，其中D和H通过声源，接收点和阳台边缘的位置来几何定义。将ERV的差异应用于此关系，发现D/H的最大极限为D/H，其中悬垂下的听觉信封程度与主乐团相当于0.7至1.0。可以认为这是Auditoria阳台的设计标准。