MFL 3D finite element simulation analysis and verification of dynamic test in oil and gas pipeline
In order to solve the problem of insufficient quantization accuracy of magnetic flux leakage(MFL)detection in pipeline,a three-dimensional finite element dynamic numerical simulation model for MFL detection was established,and the effect of defects on MFL signal was studied theoretically.The process of 3D finite element simulation model was introduced.To improve the mesh quality near the defect and reduce the mesh quantity in other areas,a simplified model was designed to reduce the number of elements to 34％ and the calculation to 4％.A moving domain with appropriate clearance was introduced between the steel brush and the pipe to change the model from static to dynamic,and an equivalent magnetic circuit model was established to compensate for the influence of the introduced clearance.A dynamic MFL test platform was designed,and finite element simulation was verified on a simple MFL detector and a defect sample tube.The verification results show that the axial peak error between simulation and test is 0.57％,and the radial errors between two-peaks are 0.41％ and 0.14％.Therefore,the combination of finite element simulation and dynamic test of MFL signal is a good method to effectively save the test time and cost.
oil and gas pipelinefinite element simulationequivalent magnetic circuitdynamic test
万方数据
维普
