Impact prediction and noise prevention analysis of composite noise in residential community based on Cadna / A software

Cadna / A software is widely used in simulation prediction of environmental noise in residential communities. Current research shows that Cadna / A is more reliable in predicting the impact of traffic noise, but there is less research on the composite noise formed by traffic and air conditioning equipment. In this paper, the noise levels of roads, bridges, and air-conditioning equipment around the residential area are measured on-site. Source intensity parameters are input in Cadna / A and the outdoor environmental noise map of the community is created. The measured values of the receiving points are compared with the simulated prediction values to verify The reliability of Cadna / A software to predict the impact of composite noise is presented. The simulation of the prevention and control measures of traffic noise and air-conditioning equipment noise was found. After the sound insulation screen was set, there was basically no change in the environmental noise level in the residential area. Turning off the air-conditioning equipment can significantly reduce the noise level in some areas, which is very close to the measured value.