Design And Application Of Magnetic Coupling Stress Detection Device For Oil And Gas Pipeline Wall

As an essential structure for transporting crude oil and natural gas,the design,maintenance and use of cable-stayed pipe bridges often ignore the changes in dynamic structural characteristics caused by the coupling of the oil and gas medium to the pipe and cable-stayed pipe bridge,which can cause severe damage to the cable-stayed pipe bridge in the face of dynamic loads such as earthquakes,wind loads,floods and geological disasters.Scholars at home and abroad have carried out a lot of research work on the fluid-structure coupling of oil and gas pipelines but have not yet been able to accurately reveal the mechanism of the dynamic properties of the oil and gas medium-pipeline-drawn pipe bridge coupling system with the fluid changes of the oil and gas medium to produce time-varying.In this paper,we research the dynamic properties of pipelines and cable-stayed bridges considering the influence of oil and gas media and mainly accomplish the following work.(1)In this paper,the oil and gas medium,pipeline and cable-stayed pipe bridge are used as research objects to form an oil and gas medium-pipeline-cable-stayed pipe bridge coupling system and the influence of the fluid-structure coupling effect on the dynamic characteristics of the structural coupling system is studied.The finite element calculation and analysis theory and simulation method of the flow-solid coupling effect of the cable-stayed pipe bridge is proposed,the standard model gives the parameters of the crude oil medium fluid,the spring model of the flow-solid coupling interface of the oil and gas medium and the pipe is analyzed and improved,and the dynamic equations of the oil and gas medium-pipe cable-stayed pipe bridge coupling system are analyzed.(2)The finite element calculation model structure of the two-way fluid-solid coupling dynamics of the oil and gas medium-pipe coupling system with five types of support span length,four types of liquid level height inside the pipe and five types of oil and gas medium velocity varying were established,14 single variable test conditions were designed,the displacement response and acceleration response of the pipe wall under the action of fluid-solid coupling were calculated,and the first six order inherent frequencies and main vibration patterns of the finite element calculation model structure of the pipe were analyzed.(3)The finite element calculation model structure of the two-way fluid-structure coupling dynamics of the oil and gas medium-pipeline-drawn pipe bridge coupling system with five velocities of oil and gas medium,five internal pipe diameters and five auxiliary pier positions were established,15 test conditions were designed,the displacement and acceleration responses of the pipe under the fluid-structure coupling of the oil and gas medium-pipeline-drawn pipe bridge system were calculated,and the first 12-order inherent frequencies and main vibration patterns of the finite element calculation model structure of the drawn pipe bridge were analyzed.(4)The finite element calculation model of the oil and gas medium-pipe-drag bridge structural system is established in the empty pipe state of the diagonal pipe bridge from the inflow to the outflow of the pipe,and the influence of the mechanical behavior of the oil and gas medium on the dynamic characteristics is studied.The design inlet half crude oil and half air flows in at a speed of 2m/s.The displacement and acceleration responses of each pipe node on the cable-stayed pipe bridge during the flow-through process are calculated.The first 12-order inherent frequencies and main vibration patterns of the finite element calculation model of the coupled oil and gas medium-pipe-cable-stayed pipe bridge structure are analyzed.The research results show that the oil and gas medium significantly influence the dynamic characteristics of pipelines and cable-stayed pipe bridges.The emotional aspects of the coupled system of oil and gas medium-pipeline-cable-stayed pipe bridge structure is complicated by the changes in the mechanical behavior of oil and gas medium through time,which should be paid attention to in the seismic design of such structures.