Influence and Simulation of transformer firewall device on audible noise propagation characteristics

The theoretical basis of noise reduction by noise barrier is Huygens Fresnel's wave theory. When a noise barrier is added in the propagation path between the sound source and the receiving point, the reflection, transmission and diffraction of the noise sound wave will occur when it meets the noise barrier in the propagation process. A part of the sound energy is emitted from the sound source and transmitted to the receiving point through the diffraction of the top structure of the sound barrier; A part of the sound energy can reach the sound receiving point directly through the sound barrier; When a part of the energy reaches the sound barrier, it will be reflected. If the two sound barriers are close to each other, it will be reflected many times. The ability of sound insulation and noise reduction of sound barrier is to reduce the energy of direct and transmission to the sound receiving point by blocking, and reduce the energy of diffraction to the sound receiving point through the upper structure, so as to achieve the effect of sound energy attenuation, The influence of firewall geometry on audible noise distribution of transformer is obtained [1].