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Theoretical model-based quantitative optimisation of numerical modelling for eddy current NDT

Lookup NU author(s): Anthony Simm, Professor Gui Yun TianORCiD


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Eddy current (EC) nondestructive testing (NDT) is one of the most widely used NDT methods. Numerical modelling of NDT methods has been used as an important investigative approach alongside experimental and theoretical studies. This paper investigates the set-up of numerical modelling using finite-element method in terms of the optimal selection of element mesh size in different regions within the model based on theoretical analysis of EC NDT. The modelling set-up is refined and evaluated through numerical simulation, balancing both computation time and simulation accuracy. A case study in the optimisation of the modelling set-up of the EC NDT system with a cylindrical probe coil is carried out to verify the proposed optimisation approach. Here, the mesh size of the simulation model is set based on the geometries of the coil and the magnetic sensor, as well as on the skin depth in the sample; so the optimised modelling set-up can be useful even when the geometry of EC system, the excitation frequency or the pulsed width is changed in multi-frequency EC, sweep-frequency EC or system and pulsed EC. Furthermore, this optimisation approach can be used to improve the trade-off between accuracy and the computation time in other more complex EC NDT simulations.

Publication metadata

Author(s): Yu YT, Li XH, Simm A, Tian GY

Publication type: Article

Publication status: Published

Journal: Nondestructive Testing and Evaluation

Year: 2011

Volume: 26

Issue: 2

Pages: 129-140

Print publication date: 07/04/2011

ISSN (print): 1058-9759

ISSN (electronic): 1477-2671

Publisher: Taylor & Francis Ltd.


DOI: 10.1080/10589759.2010.521827


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Funder referenceFunder name
Guangdong Province
Ministry of Education and department of Science and Technology of China
EP/E010458/1EPSRC UK