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基于流固耦合原理,在ADINA软件中建立了U型充液管道的有限元模型,对其进行了流固耦合模态分析,研究了壁厚对管道固有频率的影响;并对简支U型管道的充液过程进行了数值仿真,研究了充液加速度和壁厚对管道位移及应力的影响。结果表明:随着模态阶数的增加,管道的固有频率逐渐增大;在无耦合时计算的管道固有频率大于流固耦合状态时的结果,管道固有频率随壁厚的增加呈非线性增加;在充液过程中U型管道的最大应力出现在弯头处;在充液过程中管道的位移与应力随充液加速度的增大而增大,随壁厚的增大而减小;但无论充液加速度多大,充液后管道的最终位移基本相同。
Based on the principle of fluid-solid coupling, a finite element model of U-shaped liquid-filled pipeline was established in ADINA software. The fluid-solid coupling modal analysis was carried out and the influence of wall thickness on the natural frequency of the pipeline was studied. The filling process of pipeline was numerically simulated and the influence of liquid filling acceleration and wall thickness on pipeline displacement and stress was studied. The results show that with the increase of the modal order, the natural frequency of the pipeline increases gradually. When the natural frequency of the pipeline calculated without coupling is larger than that of the fluid-solid interaction, the natural frequency of the pipeline increases nonlinearly with the increase of the wall thickness ; The maximum stress of U-shaped pipe appeared in the elbow during the filling process; the displacement and stress of pipe increased with the increase of liquid filling acceleration and decreased with the increase of wall thickness; No matter how much filling acceleration, the final displacement of the pipe after filling is basically the same.