Abstract The radiated noise induced by the unsteady propeller forces is an important part of the vessel's total acoustic radiation. Therefore, understanding the role of propeller-shafting system in force transmission characteristics is necessary investigate the underwater vibro-acoustic responses of a vessel. This study compared the contribution of hull and propeller-shafting system to the radiated sound power under the propeller forces in different directions. First, a finite element/boundary element (FE/BE) model of a hull with relatively detailed substructures was developed to study the system's vibro-acoustic characteristics, in which the pulsating pressure at the propeller blade was transmitted to the hull through the propulsion system. The accuracy of the model was validated by experimental results. Second, finite element/boundary element method (FEM/BEM) was used to study the vibro-acoustic characteristics of the submerged system and the amplification effects of the propeller-shafting system. Finally, the radiated sound power of the propeller and the hull were compared, considering the flow-induced noise generated by the water surrounding the propeller. Results show that while it is reasonable to ignore the sound power generated by the elastic propeller structure, the flow-induced noise still needs to be considered, especially when the forces are applied to the propeller in the transverse and vertical directions.

中文翻译：

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螺旋桨作用下圆柱锥形船体的振动声学分析

摘要 螺旋桨非定常力引起的辐射噪声是船舶总声辐射的重要组成部分。因此，有必要了解螺旋桨轴系系统在力传递特性中的作用，研究船舶的水下振动声学响应。本研究比较了在不同方向的螺旋桨力作用下，船体和螺旋桨轴系系统对辐射声功率的贡献。首先，开发了具有相对详细子结构的船体的有限元/边界元 (FE/BE) 模型来研究系统的振动声学特性，其中螺旋桨叶片的脉动压力通过推进系统传递到船体. 实验结果验证了模型的准确性。第二，有限元/边界元法（FEM/BEM）被用来研究水下系统的振动声学特性和螺旋桨轴系系统的放大效应。最后，比较了螺旋桨和船体的辐射声功率，考虑了螺旋桨周围水产生的流动噪声。结果表明，虽然忽略弹性螺旋桨结构产生的声功率是合理的，但仍然需要考虑流动引起的噪声，特别是当螺旋桨在横向和垂直方向上施加力时。考虑到螺旋桨周围的水产生的流动引起的噪声。结果表明，虽然忽略弹性螺旋桨结构产生的声功率是合理的，但仍然需要考虑流动引起的噪声，特别是当螺旋桨在横向和垂直方向上施加力时。考虑到螺旋桨周围的水产生的流动引起的噪声。结果表明，虽然忽略弹性螺旋桨结构产生的声功率是合理的，但仍然需要考虑流动引起的噪声，特别是当螺旋桨在横向和垂直方向上施加力时。