Yang L, Shield B M
School of Engineering Systems and Design, South Bank University, London, United Kingdom.
J Acoust Soc Am. 2001 Jan;109(1):266-73. doi: 10.1121/1.1329617.
Long enclosures are spaces with nondiffuse sound fields, for which the classical theory of acoustics is not appropriate. Thus, the modeling of the sound field in a long enclosure is very different from the prediction of the behavior of sound in a diffuse space. Ray-tracing computer models have been developed for the prediction of the sound field in long enclosures, with particular reference to spaces such as underground stations which are generally long spaces of rectangular or curved cross section. This paper describes the development of a model for use in underground stations of rectangular cross section. The model predicts the sound-pressure level, early decay time, clarity index, and definition at receiver points along the enclosure. The model also calculates the value of the speech transmission index at individual points. Measurements of all parameters have been made in a station of rectangular cross section, and compared with the predicted values. The predictions of all parameters show good agreement with measurements at all frequencies, particularly in the far field of the sound source, and the trends in the behavior of the parameters along the enclosure have been correctly predicted.
狭长封闭空间是具有非扩散声场的空间，经典声学理论并不适用于此类空间。因此，狭长封闭空间内声场的建模与扩散空间中声音行为的预测有很大不同。已经开发出光线追踪计算机模型来预测狭长封闭空间内的声场，尤其适用于诸如地铁站之类的空间，这些空间通常是具有矩形或弯曲横截面的狭长空间。本文描述了一种用于矩形横截面地铁站的模型的开发。该模型可预测沿封闭空间内接收点处的声压级、早期衰变时间、清晰度指数和明晰度。该模型还计算各个点处的语音传输指数值。已在一个矩形横截面的车站中对所有参数进行了测量，并与预测值进行了比较。所有参数的预测值与各频率下的测量值均显示出良好的一致性，特别是在声源的远场，并且已正确预测了沿封闭空间各参数的行为趋势。
