| 侯文姝,笪良龙,孙芹东,王文龙.浅海舰船噪声声强流的垂直方向性[J].,2017,36(1):73-80 |
| 浅海舰船噪声声强流的垂直方向性 |
| Vertical direction of acoustic intensity flux of ship noise in shallow sea |
| 投稿时间：2016-03-14 修订日期：2016-12-22 |
| 中文摘要: |
| 浅海环境中，确定性声源的多途声信号干涉使得接收点处声强流的垂直方向发生改变，不再与声源方向一致。只测量声场的标量声强时无法得到接收点处声强流垂直方向性，基于简正波矢量场建模和仿真，获得理想条件下宽带点声源的垂直方向性；采用单矢量水听器进行海上实验，获得海洋环境噪声和干扰条件下舰船噪声声强流的垂直方向性。仿真和实验结果表明：远场条件下，浅海干涉现象引起接收点处声强流垂直方向随频率和距离变化，其时间频率分布呈现与LOFAR谱干涉条纹相似的条纹，垂直方向的极角主要在70o~110o范围内波动。 |
| 英文摘要: |
| The interference of multi-path signal from deterministic acoustic source in shallow sea changes the vertical direction of sound intensity flux at the receiving point, which is not the same with the direction of acoustic source. The measuring of acoustic intensity in pressure field cannot provide the vertical direction of acoustic intensity. The vertical direction of acoustic intensity of wideband particle source under ideal conditions is shown by simulation vector field of normal modes. The vertical direction of sound intensity flux of ship noise under ambient noise and interference is shown by single acoustic vector hydrophones in sea trial. The results of simulation and experiment show that, in far field condition, the interference phenomenon in shallow sea causes the vertical direction of acoustic intensity at the receiving point changing with frequency and distance, and the time and frequency distribution appear the fringe which is similar with the interference fringe in LOFAR figure. The polar angle which represents the vertical direction of acoustic intensity is between 70o and 110o. |
| DOI：10.11684/j.issn.1000-310X.2017.01.014 |
| 中文关键词: 舰船噪声,声矢量水听器, 声强流 |
| 英文关键词: Ship noise,Acoustic vector hydrophones,Acoustic intensity flux |
| 基金项目: |
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