2.5D Finite Element Simulation – Eddy Current Heat Exchanger Tube Inspection using FEMM

Pullen, Ashley and Charlton, Peter (2015) 2.5D Finite Element Simulation – Eddy Current Heat Exchanger Tube Inspection using FEMM. The e-Journal of NDT, 20 (7). ISSN 1435-4934

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Official URL: http://www.ndt.net/?id=18011

Abstract

The paper describes the use of the open source electromagnetic finite element software package, FEMM used to simulate heat exchanger eddy current tube inspection. The paper provides an understanding of eddy current impedance plane responses to a number of defects using 2.5D axisymmetric finite element analysis. The scenarios examined are; corrosion, internal and external defects, baffle plate and baffle plate with fretting responses, internal defect, lift-off or improper fit and tube exit responses. A mathematical method of estimating the eddy current density as a function of penetration depth is also investigated with less than 5% over estimation. Finite element mesh optimisation is also investigated and a trade-off is made between accuracy and simulation time. Background knowledge on basic eddy current and heat exchangers is provided in the opening sections of the paper. Probe frequency variation and optimisation along with mesh boundaries are also discussed to help improve the simulation method. The effects of altering inspection frequency and the multiple effects this has on the inspection process are also discussed throughout the paper.

Item Type: Article
Uncontrolled Keywords: Current Heat Exchanger Tube Inspection Finite element simulation
Subjects: Q Science > QC Physics
T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TJ Mechanical engineering and machinery
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Institutes and Academies > Wales Institute for Science & Art (WISA) > Academic Discipline: Engineering
Depositing User: Professor Peter Charlton
Date Deposited: 23 Jan 2017 11:02
Last Modified: 24 Jan 2017 15:52
URI: https://repository.uwtsd.ac.uk/id/eprint/683

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