Simulation Analysis And Optimization Of The Magnetic Flux Leakage Detection System Design

Nondestructive testing is indispensable part in modern industria,is an important means of quality tests for manufacture and use of modern industrial products.Compareing other detection method,Magnetic flux leakage testing,which is fast,detection of many types,low requirements for environment and no radiation and so on,widely used in the oil and gas pipelines and storage tanks test.First,according to the history of magnetic flux leakage testing,magnetic dipole model method was developed,baseded on theoretical model for the defect of pipeline.And rectangular was taken an example to calculate the corresponding leakage magnetic field distribution.For the shortcomings of a magnetic dipole model,the finite element method is applied to the analysis of magnetic flux leakage.By using ANSYS simulation software,the entity model for magnetic flux leakage testing is set up.And then optimize the magnetizer structure analysis,it is concluded that ferromagnetic material working point selection method and the permanent magnet volume select optimum criterion.On the basis of the above method,Finally,numerical optimization of the geometric parameters of the magnetization device is given.For quantitative defect magnetic flux leakage detection problem of the influence factors of magnetic flux leakage testing-shape parameters,the intensity of magnetization,probe lift-off height,speed and other factors were analyzed,and the leakage magnetic field change rule,and approximate formula is given.By comparing with the test data samples to validate the correctness of the finite element simulation,provide theoretical support for the prototype development.For MFL inverse solving problems,the commonly optimization methods include successive approximation method,multivariate statistical analysis method and neural network.This paper made a preliminary introduction.