XIX Sympozjum Srodowiskowe PTZE - materialy.pdf

XIX Sympozjum PTZE, Worliny 2009
POTENTIAL FORMULATIONS
FOR SOLVING TEAM PROBLEM 27
Zoltán Pólik, Miklós Kuczmann
Laboratory of Electromagnetic Fields,
Széchenyi István University, H-9026, Egyetem tér 1, Győr, Hungary
e-mail: polikzoltan@gmail.com
In the case of many applications, for example NDT and NDE systems, but the most devices
based on electromagnetic discipline, the exact modelling is very important during the
development stage.
The problem 27 of TEAM Workshops provides experimental and numerical solutions of a
known problem [1]. It is a useful example to test the efficiency and the speed of different
numerical methods.
The built up of the arrangement can be seen in Fig. 1, which is implemented in the frame of
the COMSOL Multiphysics software package.
Fig. 1. The finite element mesh of the arrangement
Above an aluminum cylinder there are a „pancake coil” and two sensors which are able to
measure the horizontal radial component of the magnetic flux density. Below one of the
sensors there can be three different flaws. The measured quantity – HDFD (Horizontal
Differential Flux Density) – is the difference between the tensions provided by the two
sensors during a current turn-off effect [2]. The simulated results of the problem by the
International TEAM Workshop can be seen in Fig. 2.
In the present, a three dimensional finite element model has been built up to simulate the
HDFD of the above arrangement in the case of the three defined flaws by using the A,V – A
potential formulation with vector finite elements [3,4].
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