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 Supported Pro-pulsion System-hull Coupling System

摘要:

【目的】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。【方法】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】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14.65dB,水平激励下降低4.48dB,垂向激励下降低8.36dB。【结论】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:

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