XIX Sympozjum Srodowiskowe PTZE - materialy.pdf

XIX Sympozjum PTZE, Worliny 2009
placed on the inner surface of the specimen. Inner surface means that the detecting sensor and
the crack are on the same side. A U-shaped yoke placed above the specimen is used to
generate the magnetic field inside the specimen. The current of coil wounded around the yoke
can be a direct current or an alternating current supplied by a computer controlled current
amplifier. The function of current can be set by LabVIEW functions.
Fig. 2. Result of the simulation and the measurement
The paper presents the building of a computer controlled measurement system based on
National Instruments (NI) Data Acquisition card and NI LabVIEW software package. The
aim of this research is to detect manufactured surface cracks on steels by applying a magnetic
flux leakage method. A finite element procedure based on edge elements and on the magnetic
vector potential has been implemented. The full paper will show a comparison between
measured and simulated data. Fig. 2 presents an example about simulated and measured data.
Acknowledgement
This paper was supported by the János Bolyai Research Scholarship of the Hungarian
Academy of Sciences (BO/00064/06), by Széchenyi István University, and by the Hungarian
Scientific Research Fund.
References
[1] G. Kovács, M. Kuczmann, Simulation of a Magnetic Flux Leakage System, Proceedings of the
2nd Symposium on Applied Electromagnetics, SAEM08, Zamosc, Poland, June 1-4, 2008,
pp. 97-100, CD Proceedings.
[2] M. Kuczmann, A. Iványi, The Finite Element Method in Magnetism, Akadémiai Kiadó,
Budapest, 2008.
[3] O. Bíró, Edge Element Formulations of Eddy Current Problems, Comput. Meth. Appl., Mech.
Engrg., vol. 169, 391-405, 1999.
[4] O. Bíró, CAD in Electromagnetism, Advances in Electronics and Electron Physics, vol. 82,
pp. 1-96, 1991.
[5] National Instruments. LabVIEW, Basics Manual. 2000.
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