Flow noise response of a diaphragm based fibre laser hydrophone array

被引:6
|
作者
Chandrika, Unnikrishnan Kuttan [1 ]
Pallayil, Venugopalan [1 ]
Lim, Kian Meng [2 ]
Chew, Chye Heng [2 ]
机构
[1] Natl Univ Singapore, Acoust Res Lab, Singapore 117548, Singapore
[2] Natl Univ Singapore, Dept Mech Engn, Singapore 117548, Singapore
关键词
Flow noise; Fibre laser hydrophone; Towed array sonar; TURBULENT-BOUNDARY-LAYER; WALL PRESSURE SPECTRUM; PERFORMANCE; CYLINDER;
D O I
10.1016/j.oceaneng.2014.09.014
中图分类号
U6 [水路运输]; P75 [海洋工程];
学科分类号
0814 ; 081505 ; 0824 ; 082401 ;
摘要
Flow noise is one of the factors limiting the performance of towed array systems, especially thin-line arrays. Response of a fibre laser hydrophone array to axisymmetric boundary layer wall pressure excitation is presented. A simplified theoretical model is obtained to predict the flow noise levels inside fluid filled towed arrays. An axisymmetric wall pressure model was used along with frequency-wavenumber transfer characteristics obtained from finite element analysis (FEA) to arrive at flow noise estimates under normal operating speeds. The results were then compared with internal pressure spectra obtained from the simplified theoretical model. The flow noise levels corresponding to operating tow speeds below 2 m/s for the analysed configuration are found to be lower than the nominal low-level ambient noise floor observed in the sea for frequencies greater than 200 Hz. The results show that the flow noise isolation achieved through fluid filled array construction reduces with increase in tow speed. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:235 / 242
页数:8
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