A priori experimental design for inverse identification of magnetic material properties of an electromagnetic device using uncertainty analysis
Purpose - The purpose of this paper is to determine a. priori the optimal needle placement so to achieve an as accurate as possible magnetic property identification of an electromagnetic device. Moreover, the effect of the uncertainties in the geometrical parameter values onto the optimal sensor position is studied. Design/methodology/approach - The optimal needle placement is determined using the stochastic Cramer-Rao lower bound method. The results obtained using the stochastic method are compared with a first order sensitivity analysis. The inverse problem is solved starting from real local magnetic induction measurements coupled with a 3D finite element model of an electromagnetic device (EI core inductor). Findings - The optimal experimental design for the identification of the magnetic properties of an electromagnetic device is achieved. The uncertainties in the geometrical model parameters have a high effect on the inverse problem recovered solution. Originality/value - The solution of the inverse problem is more accurate because the measurements are carried out at the optimal positions, in which the effects of the uncertainties in the geometrical model parameters are limited.
electromagnetism inverse problem magnetic devices physical properties of materials optimum design optimal experiment design stochastic cramer-rao bound magnetic material identification