Abstract: In order to investigate the influence of structural parameters of hydraulic pipeline on vibration characteristics,a finite element model of hydraulic pipeline with different geometric structure parameters was established,and the influence of different structural materials,different bending radius and different bending angles on the vibration characteristics of hydraulic pipeline was studied based on fluid-structure coupling.It was found that under the condition of certain piping structure,the inherent frequency of titanium alloy Ti-3Al-2.5V was the smallest and the deformation of stainless steel 1Cr18Ni9Ti is the smallest. With a fixed total length of hydraulic pipeline,an increase in the bending radius raises intrinsic frequency and decreases deformation,while an increase in the bending internal angle leads to a decrease in intrinsic frequency but decreases deformation. In the case of a fixed length of straight pipe section,an increase in the bending radius leads to a decrease in the intrinsic frequency and results in an increase in the amount of deformation,while an increase in the bending internal angle leads to a decrease in intrinsic frequency but decreases the amount of deformation.

Key words: hydraulic pipeline, structural parameters, vibration characteristics, natural frequency, finite element model