| 准周期随机声脉冲序列信号在浅海波导中的传播 |
| |
| 引用本文： | 孙军平,林建恒,杨军,蒋国健,衣雪娟,江鹏飞.准周期随机声脉冲序列信号在浅海波导中的传播[J].声学学报,2017,42(1):21-26. |
| |
| 作者姓名： | 孙军平 林建恒 杨军 蒋国健 衣雪娟 江鹏飞 |
| |
| 作者单位： | 1 中国科学院水声环境特性重点实验室 北京 100190; |
| |
| 基金项目： | 国家自然科学基金项目(11174314,11474301,11204345)和声场声信息国家重点实验室课题(SKLA201502)资助 |
| |
| 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。
|
| 关 键 词： | 航船辐射噪声 准周期随机声脉冲序列 海洋环境 线谱 |
| 收稿时间： | 2015-12-21 |
Propagation of quasi-periodic random sound pulse sequence signals in shallow-water waveguides |
| |
| Affiliation: | 1 Key Laboratory of Underwater Acoustic Environment, Chinese Academy of Sciences Beijing 100190;2 Qingdao Laboratory, Institute of Acoustics, Chinese Academy of Sciences Qingdao 266023;3 University of Chinese Academy of Sciences Beijing 100190;4 Key Laboratory of Noise and Vibration Research, Chinese Academy of Sciences Beijing 100190 |
| |
| 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. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《声学学报》浏览原始摘要信息 |
|
点击此处可从《声学学报》下载全文 |
|
