弯曲输流管路振动特性分析

Vibration Characteristics Analysis of Curved Pipeline Conveying Fluid

以非平面Z形空间弯曲管路为研究对象,基于ANSYS Workbenchg平台建立了有限元模型,进行了流固耦合振动特性分析。结果表明,在流固耦合作用下,此空间弯曲管路前六阶固有频率降幅约为17.0%;弯曲半径每增加20 mm,前六阶固有频率增幅为1.0%~3.0%;弹性模量每增加10 GPa,前六阶固有频率增幅约2.5%;输送介质由空气变为柴油,前六阶固有频率降幅约13.0%;输送介质由柴油变为原油,前六阶固有频率降幅约3.7%。流固耦合作用会降低非平面Z形空间弯曲管路的前六阶固有频率,但对管路的振型没有影响,弯曲半径和弹性模量的增加会增大管路固有频率,输送介质密度对固有频率影响显著。

Based on the study of the non-planar Z-shaped space curved pipeline,the finite element model is built based on ANSYS Workbench,and the fluid-structure interaction vibration characteristics are analyzed.The results show that under the action of fluid-structure interaction,the first six-order natural frequencies of the space curved pipeline decrease by about 17.0%;for every 20 mm increase in bending radius,the first six-order natural frequencies increase by 1.0%to 3.0%;for every 10 GPa increase in elastic modulus,the first six-order natural frequencies increase by about 2.5%;the transport medium is changed from air to diesel,and the first six-order natural frequencies decrease by about 13.0%,the transmission medium changed from diesel oil to crude oil,the first six-order natural frequencies decreased by about 3.7%.The fluid-structure interaction can reduce the first six�order natural frequencies of the non-planar Z-shaped space curved pipeline,but it has no effect on the vibration mode of pipeline,the natural frequency increases with the increase of bending radius and elastic modulus,the density of conveying medium has a significant effect on the natural frequency.