Abstract
The magnetic flux leakage technique is a widely used method for non-destructive testing of pipe-lines. The inspection of pipelines is typically performed with the assistance of a robotic tool called PIG, which is equipped with an array of magnetic circuits responsible for inducing a magnetic field in the pipeline wall. This magnetic field leaks out of the pipeline wall at the locations where potential anomalies are present. The optimization of the geometrical configuration of these magnetic circuits, as a method to improve the probability of detection of the technique, has been a question of great interest in recent studies. Drawing on the concept of Kirchhoff’s laws and the application of the finite elements method, this paper makes use of the forward analysis of the magnetic circuit to suggest a methodology for its design optimization. A lumped parameter model was proposed and calibrated to yield similar results as compared to the finite elements model. Following a multi-objective approach, a Genetic Algorithm was implemented in order to minimize the dimensions of the magnetic circuit while looking at the same time for the maximum magnetic flux leakage at locations with pipeline damage. The optimum design obtained by means of the Genetic Algorithm was experimentally validated. The results demonstrate the superior performance of the optimal magnetic circuit in comparison with two other non-optimal circuits.
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References
Wilson, J.W., Tian, G.Y.: Pulsed electromagnetic methods for defect detection and characterization. NDT&E Int. 40(4), 275–283 (2007)
American Petroleum Institute and American Society of Mechanical Engineers.: API 579–1/ASME FFS-1. In: Fitness-for-Services, p. 1128. ASME (2007)
Stefanita, C.-G.: Magnetism: Basics and Applications. Springer, Berlin (2012)
Wang, Z.D., Gu, Y., Wang, Y.S.: A review of three magnetic NDT technologies. J. Magn. Magn. Mater. 324(4), 382–388 (2012)
Leupold, H.A., Potenzioni II, E.: A Permanent Magnet Circuit Design Primer. US Army Research Laboratory, New Jersey (1996)
Jansen, H.J., Van de Camp, P.B.J., Geekdlnk, M.: Magnetization as a key parameter of magnetic flux leakage pigs for pipeline inspection. Br. J. Non-destruct. Test. 36(9), 672–677 (1994)
Noeouzi, E., Ravanboud, H.: Optimization of the flux distribution in magnetic flux leakage testing. Mater. Eval. 51(10), 360–364 (2010)
Ammari, H., Buffa, A., Nedelec, J.-C.: A justification of eddy currents model for the Maxwell equations. Soc. Ind. Appl. Math. 60, 1805–1823 (2000)
di Barba, P., Savini, A., Wiak, S.: Field Model in Electricity and Magnetism. Springer, Netherlands (2013)
American Society of Mechanical Engineers.: B31.4 Pipeline Transportation Systems for Liquid Hydrocarbons and Other Liquids. ASME (2006)
Valentine, F.: Effect of Debris-Induced Lift-off on Magnetic Flux Leakage Inspection Results, Thesis. Morgantown, West Virginia (2000)
Yang, L., Zhang, G., Liu, G., Gao, S.: Effect of lift-off on pipeline magnetic flux leakage inspection. In: 17th World Conference in NDT. Shanghai (2008)
Xiao-Chun, S., Song-Ling, H., Wei, Z.: Optimization of the magnetic circuit in the MFL inspection system for storage-tank floor. Rus. J. Nondestruct. Test. 43(5), 326–331 (2007)
Xiuli, C., Dechang, Z., Guixiong, L.: Study on simulation and experiment of the magnetizer in magnetic flux leakage testing. In: International Conference on Mechatronics and Automation—IEEE. Harbin (2007)
Park, G.S., Jang, P.W., Rho, W.Y.: Optimum design of a non-destructive testing system to maximize magnetic flux leakage. J. Magn. 6(1), 31–35 (2001)
Wang, X., Wu, X., Xu, J., Ba, H.: Study on the lift-off effect on MFL signal with magnetic circuit model and 3D FEM. Br. Inst. Non-Destruct. Test. 54(9), 505–510 (2012)
Han, W., Que, P.: 2D defect reconstruction from MFL signals by a genetic optimization algorithm. Rus. J. Nondestruct. Test. 41(12), 809–814 (2005)
Han, W., Que, P.: An improved genetic local search algorithm for defect recontruction from MFL signals. Rus. J. Nondestruct. Test. 41(12), 815–821 (2005)
Hari, K.C., Nabi, M., Kulkarni, S.V.: Improved FEM model for defect-shape construction from MFL signal by using genetic algorithm. Sci. Meas. Technol. IET 1(4), 196–200 (2007)
Jiang, X.L., Xia, Y.F., Hu, J.L., Yin, F.H., Sun, C.X., Xiang, Z.: Optimal design of MFL sensor for detecting broken steel strands in overhead power line. Progr. Electromagn. Res. 121, 301–315 (2011)
Han, W., Xu, J., Tian, G.: MFL inspection defect reconstruction based on self-learning PSO. In: Nondestructive Evaluation/Testing: New Technology & Application. Jinan (2013)
Wenhua, H., Ping, Y., Haixia, R.: Application of damping-boundary-based PSO to MFL signal inversion. In: Third International Conference on Measuring Technology and Mechatronics Automation—IEEE. Shangshai (2011)
MATLAB. www.mathworks.com
Jackson, J.D.: Classical Electrodynamics. Wiley, New York (1998)
Al-Naemi, F.I., Hall, J.P., Moses, A.J.: FEM modelling techniques of magnetic flux leakage-Type NDT for ferromagnetics plate inspections. J. Magn. Magn. Mater. 304(2), 790–793 (2006)
Katragadda, G., Si, J.T., Lord, W., Sun, Y.S., Udpa, S., Udpa, L.: A comparative study of 3D and axisymmetric magnetizer assemblies used in magnetic flux leakage inspection of pipelines. Trans. Magn. 32(3), 1573–1576 (1996)
COMSOL. www.comsol.com
FW Bell. www.fwbell.com
Acknowledgments
The authors thank Corporación para la Investigación de la Corrosión, in Piedecuesta, Colombia, for granting access to the laboratory for experimental validation of the simulation results found in this investigation.
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Appendix
Appendix
This section presents the convergence graphs of the genetic algorithms used in this project. The horizontal axis shows the number of possible generations for each algorithm, along with the generations that were actually used by the algorithm, to satisfy the optimal conditions being sought. The vertical axis represents the values of the optimization function at each iteration. The crosses represent the average value of the optimization function for each generation and the points are the elite values of each generation (see Figs. 12, 13).
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Parra-Raad, J.A., Roa-Prada, S. Multi-Objective Optimization of a Magnetic Circuit for Magnetic Flux Leakage-Type Non-destructive Testing. J Nondestruct Eval 35, 14 (2016). https://doi.org/10.1007/s10921-015-0329-1
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DOI: https://doi.org/10.1007/s10921-015-0329-1