超深水半潜式钻井平台机舱舱室噪声预报与控制

Prediction and control of cabin noise of ultra-deepwater semi-submersible drilling platform

针对超深水钻井平台舱室噪声的控制问题,本文建立了某超深水钻井平台舱室全频段噪声预报模型,对柴油发电机组舱室及其相邻舱室的噪声进行了分频段预报和分析。在此基础上,提出了控制目标舱室噪声的可行方案。结合预报结果依次研究了铺设吸声材料以及设置复合舱壁结构对海洋平台舱室噪声的降噪效果,同时探讨了发电机组加装隔声罩对舱室噪声的影响。研究结果表明:柴油发电机舱室及其相邻舱室噪声的主要贡献量为设备直接辐射产生的空气噪声;在舱壁表面敷设吸声材料可有效降低舱室噪声,降噪效果随着吸声材料的厚度而增加,在吸声材料达到一定厚度后影响较小。相对于敷设吸声材料,采用复合舱壁结构对柴油发电机组舱室的总声级影响较小,但机组舱室相邻舱室的总声级降低3~4 dB。改进设计了开孔封盖结构提高隔声罩的隔声性能,发电机组加装隔声罩可有效控制钻井平台舱室噪声。

A full-band noise prediction model is established based on statistical energy analysis to predict and determine the noise of several bands in the diesel generator cabin and its adjacent cabins to control the cabin noise problem of the ultra-deepwater semi-submersible drilling platform.Based on this,a feasible noise control scheme in the target cabin is proposed.Combined with the prediction results,the noise reduction effect of sound-absorbing materials and composite bulkhead structures on the cabin noise of the offshore platform is studied consecutively.At the same time,the influence of installing sound insulation cover on cabin noise is discussed.The results show that air noise caused by direct radiation of equipment contributes the most to the noise in the diesel generator cabin and its adjacent cabins.Laying sound-absorbing materials on the bulkhead surface can effectively reduce noise,and the noise reduction effect increases with the thickness of the sound-absorbing materials,then decreases when the sound-absorbing material reaches a certain thickness.On the other hand,applying a composite bulkhead structure has a smaller influence on the total sound level of the diesel generator cabin while reducing the total sound level of the adjacent cabins by 3~4 dB.An improved sealing structure can enhance the performance of sound insulation cover,which can effectively control the cabin noise of the drilling platform.