An advanced joint time-frequency analysis procedure to study cavitation-induced noise by using standard series propeller data
An advanced joint time-frequency analysis procedure to study cavitation-induced noise by using standard series propeller data
复制标题
使用标准系列螺旋桨数据研究空化引起的噪声的先进联合时频分析程序
DOI：
10.1016/j.oceaneng.2018.10.026
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发表时间：
2018
影响因子：
5
通讯作者：
Weichao Shi
中科院分区：
文献类型：
--
作者：
B. Aktas;M. Atlar;P. Fitzsimmons;Weichao Shi
由于水下噪声对海洋动物的潜在影响，在过去十年中，水下噪声引起了人们的极大兴趣。商业航运是主要贡献者之一。在船上的各种源中，空化在其开始之后的整体辐射噪声水平中占主导地位。除其重要性外，驱动空化相关噪声的机制以及某些空化动力学贡献的频率区域还没有得到充分的研究。为了解决这一差距，在文献中，已经进行了一项研究，以提供一个合理的螺旋桨空泡噪声预测方法的手段，并提供增强的洞察力，通过应用适当的信号处理methods.Within这个框架内，本研究提出了一种先进的联合时间-频率分析程序，研究空泡噪声通过使用标准系列螺旋桨数据。对子午线标准螺旋桨系列的6个成员进行了系统的空泡风洞试验，以研究主要螺旋桨设计参数如叶片面积比（BAR）、螺距直径比（P/D）和叶片数的影响。此外，这些螺旋桨进行了测试背后的系统变化的尾流再现尾流屏幕除了开放的水条件。同步的压力脉冲和噪声测量结合高速空化观察，然后利用开发一个先进的空化动力学分析工具，以提供更好的洞察空化引起的噪声。对测量结果的分析表明了空化对辐射噪声水平的重要性，以及在某些频率范围内不同空化动力学的影响。
Underwater noise has attracted significant amount of interest in the last decade because of its potential impact on marine fauna. Commercial shipping is one of the major contributors. Amongst various sources on-board, cavitation dominates the overall radiated noise levels beyond its inception. Besides its significance, the mechanisms driving cavitation related noise and frequency regions that certain cavitation dynamics contribute into are not studied sufficiently. To address this gap in the literature, a study has been conducted to provide means of a plausible propeller cavitation noise prediction method and to provide enhanced insight to the noise creating mechanisms of cavitation by applying appropriate signal processing methods.Within this framework this study presents an advanced joint time-frequency analysis procedure to study cavitation-induced noise by using standard series propeller data. Systematic cavitation tunnel test are conducted with 6 members of the Meridian Standard propeller series that are carefully chosen to study the influence of major propeller design parameters such as Blade Area Ratio (BAR), Pitch to Diameter (P/D) ratio and blade number. Moreover, these propellers are tested behind systematically varied wake inflows reproduced by wake screens in addition to the open water conditions. Synchronized pressure pulse and noise measurements in combination with high-speed cavitation observations are then utilized to develop an advanced cavitation dynamics analysis tool to provide better insight into cavitation-induced noise. The analysis of the measurements has shown the significance of the cavitation on radiated noise levels and the impact of different cavitation dynamics in certain frequency regions.