174000dwt散装货船上层建筑舱室次声研究

Research on Superstructure Cabin's Infrasound of 174000 dwt Bulk Carrier

为研究大型散装货船上层建筑舱室中次声分布特性,找出舱室内次声的主要次声源、影响因素及其能量大小,以便为进一步研究舱室次声对船员的影响和舱室次声的防护与控制提供有价值的参考,对某174000dwt散装货船上层建筑舱室内实测噪声声压信号进行了分析。采用自功率谱(Power Spectral Density,缩写为PSD)分析和基于经验模态分解(Empirical Model Decomposition,缩写为EMD)、希尔伯特变换(Hilbert Transmission,缩写为HT)的边缘谱分析的联合分析方法分析舱室内次声的频率特性和分布特征。分析结果表明,对于使用低速主机的尾机型船舶来说,次声是上层建筑舱室内噪声的主要成分,主要次声源是主机和螺旋桨。

In order to research the distribution characteristics of the superstructure cabin＇s infrasound of a 174 000 dwt bulk carrier, to find the main sources, influencing factors and the energy of the cabin＇s infrasound, and to provide valuable reference for the research of the cabin＇s infrasound influencing on the workers and the controlling of infrasound, the measured noise of the superstructure cabin of the 174 000 dwt bulk carrier is analyzed in this paper. The methods of power spectrum density （PSD） analysis, empirical mode decomposition （EMD） and Hilbert transmission （HT） analysis are used to analyze the frequence spectrum performance and distribution characteristics of the calin＇s infrasound. The results suggest that infrasound is the essential component of the superstructure cabin＇s noise; the main engine and the propeller are the main sources of infrasound. The foregoing conclusions are suitable for aft engine ships using low speed main engine.