舰船辐射噪声线谱检测与分析

Detection and Analysis of Ship Radiated-noise Line Spectrum

结合经典功率谱和DEMON谱分析各自的特点,对舰船辐射噪声线谱进行综合分析。基于周期图谱法进行舰船辐射噪声功率谱估计,通过线谱与连续谱分离、取除虚警及归并线谱,有效地对辐射噪声功率谱中的特征线谱进行了提取,并结合DEMON谱分析了舰船辐射噪声的调制效应和调制周期,获得诸如舰船螺旋桨转速、螺旋桨叶片数等不变的舰船物理特性,从而得到舰船辐射噪声线谱比较全面的特性,为舰船的识别和线谱辐射噪声的控制具有重要提供参考价值。

According to the respective characteristics of classical power spectrum and DEMON spectrum,ship radiatednoise line spectrum is comprehensively analyzed.Based on periodogram algorithm,the spectral estimation of ship radiatednoise is made.After separating line spectrum and continuum spectrum,eliminating fasle alarm and censoring line spectrumm,characteristic line spectrum from the ship radiated-noise is effectivly extracted.Then,the periodic modulation of ship radiated-noise is analyzed in order to obtain the ship invariant physical speciality,such as ship propeller rotation,propeller blade-number,etc.In the end,the comprehensive line spectrum characteristics of ship radiated-noise is obtained,which has important reference value for ship recognition and controlling line spectrum radiated-noise.