基于HyperMesh和Nastran的鱼雷海水管有限元分析

摘要

为了识别海水管路的模态参数,找出结构发生共振的频率段,避免共振,综合运用UG,HyperMesh,Msc.Nastran软件建立了一整套涵盖3D建模、网格划分、有限元分析流程.以海水管为例进行了自由模态分析,获得了前8阶固有频率和振型.仿真结果表明,海水管的前8阶固有频率以低频为主,波纹管是振型变化最剧烈的部分,是海水管路振动控制的对象.研究表明,该流程具有快捷高效、精度高的特点,是单一有限元软件无法比拟的.%To identify modal parameters of a seawater pipe and find out frequency bands of resonance, a process covering three-dimensional modeling, meshing, and finite element analysis is established by using the softwares UG, HyperMesh, and Msc.Nastran. Furthermore, the first 8 orders of natural frequencies and vibration modes are obtained according to the free modal analysis of the seawater pipe. Simulation results show that the first 8 orders of natural frequencies are mainly in low-frequency range, and the bellows are the target of vibration control of seawater pipeline because they possess the most variation of vibration amplitude. This process is also verified to be high in efficiency and precision.