Fatigue Life Analysis of Liquid-Filled Pipeline Under the Combined Excitation of Random Vibration and Fluid-Structure Interaction

The objective of this article is aiming at the fatigue problem of the liquid-filled pipeline, which is under the combined excitation of the external complex random loads and the internal fluid-structure interaction vibration caused by the high-pressure and high-speed fluid in the pipeline. By means of theory analysis and simulation, the combined excitation of the liquid-filled pipeline under the complex random load and fluid-structure interaction vibration was studied, and the calculation method of pipeline fatigue life under the combined excitation was given. Based on this, taking the typical ship liquid-filled pipeline as research object, ANSYS Workbench finite element simulation software was used to analyze the pipeline fatigue life under the combined excitation of random vibration and fluid-structure interaction vibration. All these conclusions can provide references for the anti-fatigue design and service life assessment of the ship's pipeline structure.