江苏科技大学学报（自然科学版）
江囌科技大學學報（自然科學版）
강소과기대학학보（자연과학판）
JOURNAL OF JIANGSU UNIVERSITY OF SCIENCE AND TECHNOLOGY(NATURAL SCIENCE EDITION)
2013年
5期
419-424
,共6页
水面舰艇%流噪声%大涡模拟%声学边界元%频域
水麵艦艇%流譟聲%大渦模擬%聲學邊界元%頻域
수면함정%류조성%대와모의%성학변계원%빈역
surface ship%flow noise%large eddy simulation%acoustic boundary element method%frequency domain
在梳理流噪声数值预报方法的基础上，采用流场大涡模拟（ large eddy simulation ，LES）和声学边界元（ boundary ele-ment method，BEM）方法在频域内计算预报了船体流噪声谱曲线，求取了其等效声中心．LES计算时选用动力学Smagorin-sky-Lilly（ dynamic Smagorinsky-Lilly，DSM）亚格子应力模型，流噪声由船体壁面脉动压力和法向速度特性决定，声源节点和声节点变量传递采用一对一的守恒传递方式．结果表明：某型船在航速14 kn时，裸船体流噪声在20 Hz～2 kHz频段内总声源级为133dB；当计算有效频段扩展到20 kHz时，总声源级达143.3 dB．流噪声主要来源于兴波引起的涡量，且主要集中于100 Hz～10 kHz频段．球首尾流区和船体尾涡区对流噪声辐射量贡献明显，特别是球首尾流区，对全频段都有明显的贡献，为水面舰艇流噪声研究提供了一条新的途径．
在梳理流譟聲數值預報方法的基礎上，採用流場大渦模擬（ large eddy simulation ，LES）和聲學邊界元（ boundary ele-ment method，BEM）方法在頻域內計算預報瞭船體流譟聲譜麯線，求取瞭其等效聲中心．LES計算時選用動力學Smagorin-sky-Lilly（ dynamic Smagorinsky-Lilly，DSM）亞格子應力模型，流譟聲由船體壁麵脈動壓力和法嚮速度特性決定，聲源節點和聲節點變量傳遞採用一對一的守恆傳遞方式．結果錶明：某型船在航速14 kn時，裸船體流譟聲在20 Hz～2 kHz頻段內總聲源級為133dB；噹計算有效頻段擴展到20 kHz時，總聲源級達143.3 dB．流譟聲主要來源于興波引起的渦量，且主要集中于100 Hz～10 kHz頻段．毬首尾流區和船體尾渦區對流譟聲輻射量貢獻明顯，特彆是毬首尾流區，對全頻段都有明顯的貢獻，為水麵艦艇流譟聲研究提供瞭一條新的途徑．
재소리류조성수치예보방법적기출상，채용류장대와모의（ large eddy simulation ，LES）화성학변계원（ boundary ele-ment method，BEM）방법재빈역내계산예보료선체류조성보곡선，구취료기등효성중심．LES계산시선용동역학Smagorin-sky-Lilly（ dynamic Smagorinsky-Lilly，DSM）아격자응력모형，류조성유선체벽면맥동압력화법향속도특성결정，성원절점화성절점변량전체채용일대일적수항전체방식．결과표명：모형선재항속14 kn시，라선체류조성재20 Hz～2 kHz빈단내총성원급위133dB；당계산유효빈단확전도20 kHz시，총성원급체143.3 dB．류조성주요래원우흥파인기적와량，차주요집중우100 Hz～10 kHz빈단．구수미류구화선체미와구대류조성복사량공헌명현，특별시구수미류구，대전빈단도유명현적공헌，위수면함정류조성연구제공료일조신적도경．
On the basis of summarizing the methods of numerical flow noise prediction , a ship′flow noise spectrum and its equivalent acoustic source are determined numerically by combining the large eddy simulation (LES) and boundary element numerical acoustics in the frequency domain .Dynamic Smagorinsky-Lilly Model ( DSM) is ap-plied to subgrid-scale stress tensor in the process of LES simulation .The fluctuation pressure and normal velocity distribution on the hull surface are treated as flow noise source with conservative transformation to the acoustic nodes.It is shown that the total sound source level of flow noise reaches 133dB in 20Hz~2kHz frequency band and 143.3dB within 20kHz broadband at the speed of 14 knots.The main source of flow noise comes from vorticity induced by the ship wave .And it concentrates mainly in 100Hz~10kHz band.Exactly, the vorticity of sonar shell and hull plays an important role in radiated noise .More attention is needed to pay to it in design .A new practical method is presented to measure the surface ship flow noise in the field of naval architecture .
