临街高大厂房噪声引起的街道声场的仿真模型

为控制临街高大厂房内空气噪声通过围护结构向相邻街道的透射传播,需在建筑设计阶段预测该噪声引起的街道声场,以确定隔声降噪措施.文中根据相关声场的特点,综合运用经典室内声场理论、虚声源法与声学辐射度方法,给出了一个仿真模型来计算厂房内噪声对街道声场的贡献,模型核心在于将声场界面进行离散化求解,并对声能透射与反射的指向性进行合理简化,使其可有效处理复杂的声场空间几何形状及声学特性的不均匀分布.

Simulation Model of Sound Field in Street Space Caused by Noise Transmitted from Bordering Large Workshop Buildings

In order to control the propagation of air-borne noise from the interior of large workshop buildings to their neighboring streets through the envelop enclosure,the sound field in the street space caused by the noise should be predicted in the design stage of buildings,which helps to determine the measures of sound insulation and noise reduction.In this paper,by considering the features of the related sound field and by synthetically employing the classical room sound field theory,the image source method and the acoustical radiosity method,a simulation model is established to calculate the contribution of the noise inside the workshop building to the sound field in the street space.The core of the model lies in the calculation by discretizing the boundary of the sound field and in the reasonable simplification of the directionality of sound reflection and sound transmission,which makes the model effective in dealing with the sound field with complex space geometry and nonuniform acoustical property distribution.