Study Of The Fluid-Structure Interaction Vibration Of Buried Bend Pipeline

As an effective method, pipeline plays an important role in modern industrial and people's life. It is called the fifth transport way except the highway, railway, water carriage and airway. Buried pipelines are buried in soil layer, suffering the stipulation of soil around the pipelines. The response included the interaction between not only pipeline and soil, but also pipeline and inner fluid. So considering the interaction of soil-pipeline-inner fluid, to carry out the research of the vibration model and the dynamic response of buried pipeline is needed for the development of the society and construction.The beam model is adopted to analyze the pipeline and the spring is used to simulate the interaction between soil and pipeline. For the interaction among the soil-pipeline-inner fluid, the differential equations of plane, vertical plane and torsional vibration are deduced by applying the Hamilton principle. The bend pipeline conveying fluid is analyzed by applying finite element method and the direct analytical method. The natural frequency and critical velocity of the pipeline under different conditions are obtained by utilizing MATLAB. The paper analyzed a variety of influenced factors and gained the natural frequencies of pipeline decreased with increase of the flowing velocity. The natural frequency, the critical velocity and the stability of the pipeline are enhanced under the restriction of soil. The paper analyzed the rules of stability of the pipeline influenced by every physical parameter of the pipelines and the character of liquid.The anti-seismic analytic theory of buried pipeline is simply studied. Utilizing ANSYS program to do time-travel analysis, considering earthquake excitation as random wave, the response of the displacement and acceleration of pipeline are obtained. The parameters of the soil, pipe and earthquake dynamic are considered as the influence of pipe response.