柔性支撑推进系统–艇体耦合系统声振特性研究

Research on Vibro-acoustic Characteristics of Flexible Supporting Propeller-hull Coupling System

摘要:

旨在研究柔性支撑推进系统对桨–轴–艇耦合系统振动噪声的影响。建立柔性支撑推进系统–艇体耦合系统数值模型，基于有限元/边界元法计算螺旋桨纵向、水平及垂向激励力下柔性支撑推进系统–艇体耦合系统的声振特性，并与传统支撑方案进行对比分析。结果表明：艇体较大的辐射噪声主要由轴系–筏架耦合模态导致，合理提高筏架质量和刚度有利于降低艇体辐射噪声；相较于传统支撑，采用柔性支撑可明显降低艇体的辐射噪声，其中在螺旋桨纵向激励下降低 14.65 dB，水平激励下降低 4.48 dB，垂向激励下降低 8.36 dB。 采用柔性支撑推进系统可降低艇体辐射噪声，为桨–轴–艇耦合系统振动噪声控制提供指导。

Abstract:

In this paper，the effect of flexible supporting propulsion system on the vibration noise of propeller-shaft-hull coupling system is studied. A numerical model of the flexible supporting propeller-hull coupling system is established. The vibration and radiated noise of the hull under the longitudinal，horizontal and vertical excitation of the propeller are calculated using finite element/boundary element method，and are compared with the traditional support system. The results show that the large radiation noise of the hull is mainly caused by the coupling mode of shafting and raft frame，and it is beneficial to reduce the radiation noise of the hull by improving the mass and stiffness of raft frame. Compared with the traditional support，the flexible support can significantly reduce the radiated noise of the hull，which is reduced by 14.65 dB under the longitudinal excitation，4.48 dB under the horizontal excitation，and 8.36 dB under the vertical excitation. The use of flexible supporting propulsion system can reduce the hull radiated noise and provide support for vibration and noise control of propeller-shaft-hull coupling system.