Research on Transient Numerical Simulation of Quantitative Identification Pattern of Pipeline Single Defect

It has been difficult to accurately identify and quantify the type and degree of pipeline defects from the results of pipeline magnetic flux leakage detection. Aiming at this problem, the numerical simulation method is used to study the pattern of quantitative identification of pipeline compound defects. According to the internal and external walls of the pipelines, the pipeline defects are decomposed into basic single damages. ,and the transient finite element simulation is used to analyze and summarize their characteristics and patterns. The results show that there is a direct correspondence between the peak and time span extracted from the results of magnetic flux leakage detection, which are used as the transient response characteristic signals, and the type and extent of defects.