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A study on acoustical design criteria of the balcony configuration in auditoria

礼堂阳台结构声学设计标准研究

基本信息

批准号：
03452228
负责人：
FUJIMOTO Kazutoshi
金额：
$ 4.42万
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 (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452228/
关键词：
Room Acoustics Concert Hall Balcony Direct Sound Early Reflections from Upside Psycho-Acoustical Experiment Auditory Impression of Envelopment 模型実験音響設計コンサ-トホ-ルバルコニ-

项目摘要

A balcony overhang is frequently set up in auditoria. The sectional shape of the under-balcony space is one of the most important factors for good acoustics in auditoria. The acoustical properties under the overhang, however, have not been clarified yet and there is so far no generally accepted criteria for acoustical of the balcony configuration. The object of this study is to make clear the relation between the shape of the balcony and the acoustical properties.As the second step, the subjective effects of the delay time(DELTAt) and the level(L) of reflections from upside is examined by psycho-acoustical experiments, because the structure of early reflections from upside, which is affected by the presence of a balcony, is regarded as one of the causes of acoustical defect under the balcony in auditorium. Simulated music sounds with a single or two reflections are uesd as stimuli. The results show that auditory size of sound image becomes smaller as DELTAt and L are smaller. Next, simulated music sound with early reflections both from horizontal directions and from upside are used as stimuli. The results show that envelopment becomes stroger as vertical component of reflected energy increases when lateral energy fraction is constant. These facts suggest that lack of early reflections from ceiling above main orchestra is a factor for disturbing good acoustics under the balcony.

在礼堂中经常设置阳台悬挑。阳台下空间的截面形状是礼堂良好声学效果的最重要因素之一。然而，悬挑下的声学特性尚未得到澄清，迄今为止还没有普遍接受的阳台结构声学标准。本研究的目的是明确阳台形状与声学性能之间的关系。第二步，通过心理声学实验考察了延迟时间（DELTAt）和上方反射电平(L)的主观效应，因为早期上方反射的结构受到阳台的影响，被认为是礼堂阳台下声学缺陷的原因之一。具有单一或两个反射的模拟音乐声音被用作刺激。结果表明，随着DELTAt和L的减小，声像的听觉尺寸变小。其次，从水平方向和向上方向的早期反射的模拟音乐声音被用作刺激。结果表明：在侧向能量分数一定的情况下，随着反射能量垂直分量的增大，包络变强；这些事实表明，缺乏来自主乐团上方天花板的早期反射是影响阳台下良好音响效果的一个因素。