In this paper, a numerical approach able to evaluate the sound power emitted by a non-cavitating flexible marine propeller blade is proposed. With asymptotic expansions and order of magnitude analysis, two main phenomena are identified: the so-called propulsion and vibroacoustic phenomenon. The propulsion phenomenon is nonlinear and models the lift generation along the blade. It creates a pre-stress and a pre-strain on a deformed configuration on which the blade vibrates and emits sound waves. The vibroacoustic phenomenon is linearized and has no retroaction on the first static phenomenon. This simplified model allows to solve the fully coupled fluid–structure system in order to compute the radiated noise of a pre-stressed blade.

中文翻译：

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柔性螺旋桨叶片振动分析的两步流固方法

在本文中，提出了一种能够评估非空泡柔性船用螺旋桨叶片发出的声功率的数值方法。通过渐近展开和数量级分析，确定了两种主要现象：所谓的推进和振动声学现象。推进现象是非线性的，模拟沿叶片产生的升力。它在变形结构上产生预应力和预应变，叶片在该变形结构上振动并发出声波。振动声学现象是线性化的，并且对第一静态现象没有反作用。这个简化的模型可以解决完全耦合的流体结构系统，以便计算预应力叶片的辐射噪声。