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Analytical Approaches to Eddy Current Nondestructive Evaluation for Stratified Conductive Structures

Author: ZhangJianHai
Tutor: XuZhiXing
School: Jilin University
Course: Mechanical Manufacturing and Automation
Keywords: Multi - layer conductive structure Eddy Current Testing Pulsed Eddy Current Testing Analytical method Differential pickup sensor
CLC: TG115.28
Type: Master's thesis
Year: 2011
Downloads: 59
Quote: 0
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Abstract


Eddy current testing technology is one of the top five non-destructive testing technology , fast, non-contact measurement and low manufacturing cost advantage because of the speed of real-time detection , so a wide range of precision manufacturing in the aerospace manufacturing , the nuclear industry , and high-speed trains . This thesis combined with multi-layer metal internal corrosion nondestructive the detection evaluation research sub-topics , the main theoretical and experimental study of multi - layer conductive structure of eddy current testing and pulsed eddy current detection model , and differential pickup sensor detects multi - layer conductive structure the eddy current model depth theoretical study . Research and innovation as follows : 1 , to study the structural change in thickness of the multilayer conductive eddy current model , Cheng-Dodd-Deeds the infinite integral model and truncated domain feature model simulation comparison . And the reflex theory based on the electromagnetic wave refraction multilayer conductive model Zhejiang University , Dr. Fan Mengbao were comparative studies, the experimental comparison , to verify the accuracy of the theoretical model . Multilayer conductor structure of eddy current testing model based on sinusoidal excitation , the analytical method of pulsed eddy current model . Pulsed eddy current experimental platform and build , through the simulation and the experiment results are very consistent . 3, based on the electromagnetic wave refraction reflection theory derived differential pickup sensor detection model of multi-layer conductive structure developed several new types of detection multilayer conductive structure of eddy current magnetic field change sensor simulation and optimization , to eliminate the incentives generated by the coil excitation field . The sensor detects only the conductive structure of the eddy current magnetic field signals , and avoid the excitation of magnetic field signals is too large mask the eddy current magnetic field signals . 4 , using pulsed eddy current laboratory equipment and experimental study of the variation in thickness of the low carbon steel . Low carbon steel can be drawn through the experimental results, the pulsed eddy current signal response characteristic .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallurgy ( Physical Metallurgy ) > Analytical tests of the metal (Metal Testing and Materials ) > Physical test method > NDT
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