临街建筑群间交通噪声一维分布灰色系统模型预测

研究交通噪声在建筑群间传播与分布的计算机模拟方法,建立在物理模型的基础上。由于噪声实际传播过程中未知因素太多,使由物理模型得出的预测结果在离声源较远处与实际相比有较大误差。本文提出的灰色系统模型预测方法,首先给出非本征灰色系统中物理参量按坐标分布的一般GM(1,1)模型,用计算机模拟方法在其有效的范围内获取的数据构成原始序列,按GM(1,1)建模方法给出交通噪声按坐标分布的预测值,预测结果在离交通干道较远处的分布更符合实际情况,在此范围内提高了预测精度。

Prediction of One-Dimension Distribution of Traffic Noise among Road-Side Buil dings with Grey System Model

Because of too many unknown factors in the pro-pagatio of noise, the prediction of noise distribution by using conventional physical model is not very accurate at distant observation-points from sound source. A gray system model for the prediction of noise propagation given in this paper was proposed. At first the general GM(1,1) model describing one-dimentional distribution of physical parameters in non-intrinsic grey system is given, then the initial data are produced by computer simulation in the effective scope of he model, finally, the pridection data of gray model are obtained. The predicted results of GM(1,1) method at distant observation points are more accordant with measured data than those obtained with by computer simulation.