户外噪声相干预测模型及其工程应用

基于几何衍射理论、相干虚源法等理论方法,提出一种适合于工程算法的户外噪声相干预测模型.该相干预测模型不仅能计算声源在经过有限长声屏障或多重声屏障时,由于多条路径衍射声形成的相干声场,还可计算声源在屏障等界面之间经多次反射后,多个反射声形成的相干声场.应用该相干预测模型对某变电站电力变压器周围的相干声场进行预测,通过与ISO9613-2标准算法、边界元法与实测值进行对比,结果表明,该户外噪声相干预测模型能反映出声波在不同位置处的波动性,比原有的ISO9613模型更接近测试结果,证明了所提理论模型的有效性,可应用于大范围的户外噪声预测计算.

Model for predicting outdoor coherent noise and its engineering application

A model for predicting outdoor coherent noise based on the geometric diffraction theory and coherent image source method was presented. The proposed model was suitable to be used in the engineering algorithm. By using the proposed model, not only the coherent sound field formed by multiple paths diffraction when sound waves gone through a finite length barrier or multiple barrier, but also that formed by multiple reflections between interfaces of barriers, could be calculated. The proposed model was experimentally used to predict the coherent sound field around a power transformer in a substation, and the results of the proposed model were respectively compared with that predicted by using the ISO9613-2, that calculated by using the boundary element method, and the directly measured values. The comparisons showed that the proposed model was valid and could be used for predicting outdoor noise in a wide range. Furthermore, the comparisons showed that the proposed model could reflect the fluctuations of sound waves at different locations, and could give predictions closer to the measured values than the ISO9613-2model.