あいまいな先験情報を利用したガルバニック腐食問題の逆解析

抄録

A method for estimating the galvanic corrosion rate was developed. In the case where the electrochemical polarization curves of metal in the electrolyte considered are available, the galvanic corrosion rate can be estimated by solving us Laplace equation with boundary conditions based on the polarization curves. The polarization curves, however, are not always available. In this case, it is necessary to estimate the density of the current across the metal surfaces from the potential values measured at some points far from the metal surfaces. This inverse problem was formulated by employing the boundary element method. Since the system of linear equations obtained was ill-conditioned, direct application of conventional numerical procedures to the equation system results in an oscillatory solution. In this paper, at first the method which estimates the relationship between potential and current density was applied. In order to improve the accuracy, a new method using apriori information which as expressed as fuzzy membership functions was developed. A sample problem was solved by the new method in order to demonstrate the accuracy.