Based On The Technology Of Ultrasonic Guided Wave Pipe Defect Analysis And Research

Pipeline transport is widely used in petroleum, chemical and other industrialfields，and Pipeline defects caused by the impact of the pipeline itself and the externalenvironment are also exposed. So, how to detect the defect location accurately andefficiently and repair or replace the pipeline, has become a major issue in today’sindustrial production and transport. Then non-destructive testing of pipeline defects isparticularly important. The traditional way of non-destructive testing is point by pointthat made the way is not only inefficient and incomprehensive, but also inaccurate, andeven the defection is not been detected. It is the contradiction between the socialdemand for pipe defect detection and traditional non-destructive testing technology,force that Ultrasonic Guided Wave NDT technology came into being.On the basis of many experts and scholars of Ultrasonic Guided Wave theory, andcombined with the latest NDT technology development, This article focuses ontheoretical modeling and experimental testing and validation of non-destructive testingof pipeline defects. First of all, for domestic and international status and achievementsin the field, the paper carry on summary review; Secondly, writer had built an effectiveexperimental platform, adopted a relatively advanced laboratory equipment andequipment, Then focuses on the method of distributed PZT sensors in the pipelineincentives and the specific mode ultrasonic guided wave. Then, it analyzes the theory ofpiezoelectric sensor for pipe inspecting, designs a different length of the piezoelectricfilm for pipeline inspection, and optimizes to select the appropriate size of piezoelectricpatches and optimal excitation frequency piezoelectric film as pipeline inspection.Reliable experimental data from large number of experiments, further analysis andprocessing, basically consistent with the experimental results with theoreticalpredictions can be obtained: the different defects of the pipe axial point prove that theultrasonic guided wave modes can seize the pipeline. Based on this result, the echocharacteristics of the research pipeline defects, compared to the echo characteristics ofthe experimental results, it can identify and locate pipeline defects.