Abstract: Various noises are generated during the operation of air ducts and equipment in block rooms of offshore platforms, which will result in variable effects on the operators and even the lives underwater. Therefore, it is necessary to put forward higher requirements for block noise control of offshore platforms. Considering the coupling effect of turbulence pulsation and fan air excitation, in the paper, the calculation model of the air duct noise of the platform block is established, and the FW-H method is used to analyze the influence of the air duct noise in the ventilation system on the sound pressure level of the platform room; Based on the statistical energy method, we further build the SEA model of the platform modular room, analyze the loss factor in the SEA subsystem and the coupling loss factor between subsystems, predict the dynamic distribution of the noise in the modular room, determine the noise propagation path and dominant component under typical working conditions, and take noise reduction measures for rooms exceeding the standard to achieve the purpose of noise control. The results show that the air duct noise of offshore platform modules is mostly in the middle and low frequency band, and has little effect on the total sound pressure level of the module room. At the same time, low-frequency noise spreads far and high frequency noise attenuates quickly. The remote rooms are mainly affected by low-frequency air noise and structural noise. Therefore, sound insulation and vibration isolation measures are designed respectively for air noise and structural noise. Our platform module rooms meet the requirements of national standards.

Key words: Air duct noise, Noise simulation and prediction, Turbulence fluctuation, Noise reduction measure, Propagation path