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首页> 外文期刊>Journal of Sound and Vibration >Unsteady hydrodynamics of blade forces and acoustic responses of a model scaled submarine excited by propeller's thrust and side-forces
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Unsteady hydrodynamics of blade forces and acoustic responses of a model scaled submarine excited by propeller's thrust and side-forces

机译：螺旋桨推力和侧向力激发的模型比例潜艇的叶片力的非稳态流体力学和声学响应

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This study presents the unsteady hydrodynamics of the excitations from a 5-bladed propeller at two rotating speeds running in the wake of a small-scaled submarine and the behavior of the submarine's structure and acoustic responses under the propeller excitations. Firstly, the propeller flow and submarine flows are independently validated. The propulsion of the hull-propeller is simulated using computational fluid dynamics (CFD), so as to obtain the transient responses of the propeller excitations. Finally, the structure and acoustic responses of the submarine under propeller excitations are predicted using a finite element/boundary element model in the frequency domain. Results show that (1) the propeller excitations are tonal at the propeller harmonics, and the propeller transversal force is bigger than vertical force. (2) The structure and acoustic responses of the submarine hull is tonal mainly at the propeller harmonics and the resonant mode frequencies of the hull, and the breathing mode in axial direction as well as the bending modes in vertical and transversal directions of the hull can generate strong structure vibration and underwater noise. (3) The maximum sound pressure of the field points increases with the increasing propeller rotating speed at structure resonances and propeller harmonics, and the rudders resonant mode also contributes a lot to the sound radiation. Lastly, the critical rotating speeds of the submarine propeller are determined, which should be carefully taken into consideration when match the propeller with prime mover in the propulsion system. This work shows the importance of the propeller's tonal excitation and the breathing mode plus the bending modes in evaluating submarine's noise radiation.
机译：这项研究提出了在小型潜艇之后以两种转速运行的5叶片螺旋桨的激振的非稳态流体动力学，以及在螺旋桨激振下潜艇的结构和声学响应特性。首先，独立验证螺旋桨流量和海底流量。利用计算流体动力学（CFD）对船体螺旋桨的推进进行仿真，从而获得螺旋桨激励的瞬态响应。最后，使用频域中的有限元/边界元模型预测了螺旋桨激励下潜艇的结构和声学响应。结果表明：（1）螺旋桨的激励是在螺旋桨谐波上是同调的，螺旋桨的横向力大于垂直力。 （2）潜艇船体的结构和声学响应主要在船体的螺旋桨谐波和共振模式频率下产生，船体的轴向呼吸模式以及垂直和横向方向的弯曲模式都可以。产生强烈的结构振动和水下噪声。 （3）在结构共振和螺旋桨谐波下，场点的最大声压随着螺旋桨转速的增加而增加，并且舵共振模式也对声辐射有很大贡献。最后，确定潜艇螺旋桨的临界转速，在推进系统中将螺旋桨与原动机匹配时应仔细考虑这些临界转速。这项工作表明了螺旋桨的音调激励，呼吸模式以及弯曲模式在评估潜艇噪声辐射中的重要性。

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