Vibration Analysis Of Fluid-structure Interaction For Petroleum Pipeline And Shape Memory Alloy Pipe Joint

Pipeline transportation is the main mode of transportation for petroleum,and during pipeline transportation,changes in pipeline cross-section,opening and closing of pipeline valves,and external factors often cause fluid in the pipeline to be in a state of unsteady flow,leading to fluid structure interaction vibration between the pipeline and the fluid.This phenomenon can sometimes cause significant damage to the pipe wall,leading to pipeline rupture or even direct damage,leading to pipeline safety accidents.On the other hand,shape memory alloy is a newly emerging material in materials science in recent years.Due to the frequent occurrence of secondary leakage in the repaired area after pipeline repair,foreign scholars have discovered a new repair method.Using shape memory alloy to make a pipeline repair device and apply it to practical projects,it has achieved good results.Therefore,this article combines the two and focuses on the vibration characteristics analysis of oil pipelines and shape memory alloy pipeline joints based on fluid structure interaction phenomenon.The main research work includes the following aspects:1.Derive the axial 4-equation of fluid structure interaction for pipelines and the constitutive model of shape memory alloy,and on this basis,improve the finite element theoretical model of fluid structure interaction vibration for oil pipelines and shape memory alloy pipeline joints,providing a theoretical basis for ANSYS Workbench finite element simulation.2.Based on the finite element theory of fluid structure interaction,modal simulation analysis is conducted on oil pipelines and shape memory alloy pipeline joints.The natural frequencies and vibration modes of the pipeline system under different size parameters and operating conditions are compared,and the degree of influence of various parameters on the natural frequencies of the pipeline system and the changes in natural frequencies and vibration modes of different orders of the pipeline are obtained.3.Conduct harmonic response analysis on the pipeline to study its operation.By analyzing the harmonic response of the pipeline after loading loads in different directions,obtain the amplitude frequency curve of the pipeline system,compare the amplitudes of different frequencies,and determine the service conditions for the pipeline to easily detect resonance.This provides theoretical support for avoiding resonance in the oil pipeline system.Through two-way fluid-solid interaction analysis of the stress and strain caused by normal working conditions and fluid pulsating pressure on the pipe wall,the dangerous points of the oil pipeline system under different working conditions are obtained,providing a basis for pipeline damage and destruction.4.Conduct vibration reduction control and optimization design on the pipeline,simulate different vibration reduction schemes,compare natural frequency,deformation,and amplitude frequency curves,and analyze the vibration reduction effects of two methods: pasting rubber damping pads at the pipeline support and applying fixed constraints on the pipeline.