3D Simulation of Edge Diffraction of Sound Barrier in Substation

With the development of urbanization, substations have started to be built in urban areas where the population is concentrated. In order to effectively control the noise pollution from substations, sound barriers are built inside the substations to block the propagation of noise, so the sound insulation value of the sound barriers becomes an important indicator. However, the edge diffraction phenomenon will lead to errors between the real sound attenuation and the laboratory measurement value. The classical geometrical diffraction theory is a commonly used method to estimate the sound attenuation from edge of the barrier. However, it is a 2D model which cannot be used for 3D problem. In order to correctly estimate the sound attenuation in a 3D environment, this paper conducts relevant research. Firstly, it investigates the influencing factors of sound attenuation caused by the edge diffraction. Then, a 3D simulation model based on the classical 2D geometric diffraction theory is proposed. The accuracy of the model is verified by simulation test and experimental test for barriers with different shapes. The results show that the model is capable of giving satisfied estimations of the edge diffraction from the sound barrier in substation.