Prediction and analysis of 220kV substation based on geometric acoustic simulation

With the continuous improvement of people's living standards, the city has gradually formed a residential community with high residential density. In order to meet the power demand of the community, each new community basically needs to establish a supporting indoor substation according to the power load of the residents. Considering the residents' electricity habits, the electricity room of the supporting substation in the residential area works 24 hours a day, resulting in frequent noise nuisance incidents. Therefore, the detailed analysis of the indoor noise distribution and the radiated noise from the envelope surface of the substation has a positive significance for the reasonable control of substation noise. In this paper, the method of combining indoor and outdoor simulation is used to predict the 220 kV indoor substation noise. The indoor noise is simulated by Odeon software, and the outdoor noise is simulated by Cadna / a software, the two kinds of software are also based on the virtual sound source and sound ray tracking method of geometric acoustics. Firstly, the noise spectrum of each wall is calculated by Odeon software, and then the noise spectrum is interpolated and attenuated according to the sound insulation spectrum of the composite wall. The calculated spectrum is used as the plane source intensity for noise prediction in Cadna / a software, and finally the noise value of sensitive points at the boundary of substation can be predicted.

Geometric-acoustics analysis of singly scattered, nonlinearly evolving waves by circular cylinders

Geometric acoustics, or acoustic ray theory, is used to analyze the scattering of high-amplitude acoustic waves incident upon rigid circular cylinders. Theoretical predictions of the nonlinear evolution of the scattered wave field are provided, as well as measures of the importance of accounting for nonlinearity. An analysis of scattering by many cylinders is also provided, though the effects of multiple scattering are not considered. Provided the characteristic nonlinear distortion length is much larger than a cylinder radius, the nonlinear evolution of the incident wave is shown to be of much greater importance to the overall evolution than the nonlinear evolution of the individual scattered waves.