摘要
由于舰船辐射噪声的调制不均匀性,在计算包络谱时,不同窄带上的包络谱会有较大差异。文章以窄带包络相关理论为基础,计算舰船辐射噪声的平均窄带包络相关系数曲线,来衡量舰船辐射噪声的非均匀调制特性,以平均窄带包络相关系数曲线的最大值点作为最佳窄带提取包络谱,给出了一种包络谱提取时窄带选择的方法。并对仿真和实录信号进行了窄带包络相关计算和验证研究。结果表明,通过计算平均窄带包络相关系数来选择最佳调制窄带,在包络谱提取中有较好的应用效果。
Envelope spectrum with different frequency bands differs for uneven modulation of ship noise.Average narrow-band envelope correlation is computed to weight uneven modulation of ship noise and a method is given to extracted envelope spectrum that referring the max of average narrow-band envelope correlation as the best band.Average narrow-band envelope correlation of simulation and real noise is calculated.The result shows it is efficient to choose optimum modulation band by calculating average narrow-band envelope correlation.
出处
《船电技术》
2012年第4期9-11,15,共4页
Marine Electric & Electronic Engineering
关键词
舰船噪声
窄带包络相关
包络谱提取
Ship Noise
Narrow-Band Envelope Correlation
Envelope Spectrum Extracted
