Development of Corrosion Monitoring System using Inverse Analysis

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The Corrosion Monitoring system for seaside structure using inverse analysis was developed. The following results was obtained.A new inverse analysis method were introduced. To relax the ill-posed of this inverse problem, we proposed the corrosion identification problem is reduced to 0-1 integer problem by considering as two discrete surface resistance values of defect and normal surface. And severe constraint on discrete value is relaxed by treating resistance coefficient as probability variable. Simple example problem was solved to demonstrate the usefulness of this method.A new technique for boundary element analysis of potential problems using a multipole expansion to obtain the solution quickly only in a target region has been developed. The capability of the present technique was verified by numerical simulations. In this technique, the multipole expansion is applied to boundary integral equations on non-target boundaries, and the expansion is truncated at the term where the error bound of the higher terms is guaranteed. This technique decreases the calculation amount by introducing multipole moments as the unknown in place of the unknown in the non-target region. To demonstrate the effectiveness of the method, some example analyses were performed. When the solutions only in the target region are needed, especially in large size boundary value problems, this technique enables us to obtain them quickly and precisely.The magnetostatic analysis is important on the corrosion detection problems and the nondestructive inspection of the structures. A new boundary integral method for analyzing magnetostatic field without the calculation and the integration of current density distribution in the electrostatic field domain which obeys Laplace equation is developed.