准周期随机声脉冲序列信号在浅海波导中的传播

Propagation of quasi-periodic random sound pulse sequence signals in shallow-water waveguides

摘要: 准周期随机声脉冲序列作为船舶辐射噪声信号模型具有合理性和一定普适性,这里将此模型与海洋波导结合,探讨基于此模型产生的噪声线谱经波导传播后的物理规律变化,即船舶辐射噪声经波导作用后的信号物理特性。理论分析和传播仿真计算表明,准周期声脉冲序列船舶噪声信号所含有的线谱由于受随机波导的随机性和多途干涉共同作用,序列脉冲出现的周期性显著被削弱,线谱相对幅度将"额外"快速衰减,从一个视角揭示了船舶辐射噪声线谱不稳定的原因,为船舶辐射噪声(尤其线谱)特性进一步研究提供了相应的理论支持。

Abstract: It is an efficient method to model ship radiated noise as quasi-periodic random sound pulse sequences. Based on the model, the characteristics changes of ship noises after through shallow-water waveguides are discussed. Theoretical analysis and numerical simulation show that random waveguides and multi-path effects can bring additional much transmission loss for the noise line spectra, demonstrating the instability of ship radiated noise line spectra to a certain extent, and providing some theoretical support for advanced studies of ship radiated noise.