ObjectiveTo perform numerical simulation using CadnaA noise modeling software to analyze noise sources and sound pressure levels, assess the contribution of different noise sources and the distribution of the sound field, and provide scientific evidence for workplace noise control.MethodsA fan area in a factory was selected as the study site. Noise sources in this area were identified, measured, and investigated regarding occupational exposure. Based on simulations using CadnaA software, the spatial distribution of the sound field and the impact and contribution of major noise sources on the pedestrian walkway in the fan area were analyzed. The effectiveness of noise control measures was also evaluated.ResultsThe sound pressure levels of the fans and supporting motors in the area ranged from 87.8 to 99.7 dB (A). The noise levels at the cooling vents of large fan motors exceeded 90 dB (A). The sound pressure levels of the dust collector and filter box ranged from 93.8 to 99.2 dB(A). Noise levels along the northern walkway of the fan area were below 80 dB(A), while those along the southern walkway ranged from 80.7 to 86.6 dB (A). Simulation analysis indicated that seven devices near the southern side of the fan area contributed over 70% of the noise at various measurement points. Targeted noise reduction measures, including installing acoustic enclosures, silencers, and sound -insulating wraps, were implemented for major noise sources such as the M104A fan, M104 filter box, LG1 dust collector, M109A fan, and M105 fan. Both enclosures and silencers were constructed with high surface density panels and damping layers specifically designed for medium - and low -frequency noise, enhancing sound insulation and reducing vibration. After implementing these noise reduction measures, noise levels at southern walkway points decreased by 3.8 to 8.9 dB, with all levels falling below 78.6 dB(A). The discrepancy between simulation results and actual measurements at the same locations ranged from -0.2 to 1.4 dB, all within an acceptable error margin (< 3 dB).ConclusionsUsing CadnaA noise simulation software to model noise attenuation and analyze noise contribution in workshops is feasible and can provide useful insights and references for workplace noise control.