【作者】 李晨阳；

【导师】 李维嘉；

【作者基本信息】 华中科技大学 ， 船舶与海洋结构物设计制造， 2011， 硕士

【摘要】 由于舰船管道系统存在振动并因此产生辐射噪声,对舰船的隐蔽性、可靠性、舒适性造成很大影响。为改善舰船舱内工作环境、保证舰船管系可靠稳定工作,在船舶结构设计中都必须事先了解管道振动和噪声传播的机理和特性。本文主要应用有限元数值分析和声学边界元数值分析计算机仿真相关理论,对典型舰载管道结构流固耦合作用下声场辐射进行了分析。文章首先利用通用有限元软件ANSYS子模块MFX对载流管道流固耦合进行分析,然后利用ANSYS软件与SYSNOISE软件的接口导出管道模型,并提取管道有限元模型表面单元网格数据及其法向位移,分别作为SYSNOISE软件中管道边界元模型和边界条件,进而模拟出管道外场声辐射。通过对管道模型流固计算和噪声辐射分析,发现壳体厚度、阀门开闭时间、管内流体稳态流速以及管夹特性等因素对管道声辐射均有一定的影响,并根据分析结果对管道降噪优化进行了初步探讨。最后,通过管道振动测试实验,验证了利用MFX软件对管道流固耦合分析的正确性。本文的研究为解决工程实际中管道结构的噪声问题及其优化设计,提供了一种方便有效的途径。更多还原

【Abstract】 Because the vibrations of a pipe system and its radiation sound field may affect the concealment, reliability and comfort of ships. To improve the work environment and the dependability of pipe systems abroad, it is important to understand the vibrations and sound radiation of pipe systems, when design them.Finite Element Method (FEM) and Boundary Element Method (BEM) and computer imitation are applied to analyze the radiation sound field considering the fluid-solid interaction of a pipe. Firstly, the normal displacement on the fluid-solid interface is calculated in MFX, which is a subroutine of ANSYS. Then the data of shell element and the normal displacement of the outer surface are drawn out and are set as the BEM model and its boundary conditions. From above analyzing, it finds that such factors as the thickness of the pipe, the time span of the valve closing and opening, the velocity, the characteristic of pipe clamp, influence the sound field, and provides optimum design method. At last, from the measurement of pipe vibration, it validate the correctness of the analyzing of coupling pipe by MFX. The study gives a convenient and effective way for reduce noise and optimum design of typical pipes in engineering.更多还原